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Discussion Starter #1
I was out of town on business but Dave McLain has the 403C for my white Pantera
on the dyno. The block is the 4 bolt main block out of my red Pantera. While
it had seen only 25K miles, it needed a slight clean up due to some surface
rust so we decided to go to a 4.005" bore using off-the-shelf Diamond 351C
stroker pistons. The parts list looks like:

Ford 351C block 4 bolt main block, 0.005" over (4.005" bore), not zero-decked
Diamond forged Cleveland stroker pistons (4.005" bore for 4" stroke and 6"
rods, 14.5 cc's dished, plasma moly rings)
403 cubic inch displacement (4.005" bore by 4" stroke)
SCAT 4340 steel forged 4" stroke SVO (Windsor design with Cleveland mains,
requires snout spacer) crankshaft
SCAT 4340 forged steel I-Beam rods (6" long with 7/16" ARP bolts)
Romac 351C SFI spec harmonic damper, zero balance
Clevite H-Series rod bearings (for SBC dimension rods)
Stroker kit internally balanced
Schiefer neutral balance aluminum flywheel
Crane link bar retrofit hydraulic roller lifters (p/n 36532-16)
Mallory Unilite vacuum advance distributor (small cap for Pantera firewall
and rear window clearance)
Crane steel distributor gear (p/n 52971-1 for 351C with 0.531" shaft dia.)
Pioneer brass freeze plug set (p/n 830005)
J.P. Performance double roller timing chain (German Iwis chain)
Ford Motorsport M-6005-A351 heavy duty chrome moly oil pump driveshaft
Blueprinted Melling M84A standard volume oil pump
Ultra Pro Machining hydraulic roller oil
Armondo Pantera gated and baffled road race oil pan
Ford Motorsport high port head gaskets for 351C block
Edelbrock aluminum 351C water pump (p/n 8844)
Trend custom length 0.080" wall push rods (for the taller roller lifters)
Fuel pump block off plate (dyno providing the fuel flow)
Bullet custom hydraulic roller cam (see specs below)
Competition Cams beehive springs (p/n 26095, 150 lbs @ 2", 375 lbs @ 1.25")
QFT SS-830 carb (claimed flow 900 CFM @ 1.5" Hg)
MagnaFlow single 2.5" inlet, dual 2.5" outlet mufflers, polished satinless
steel (p/n 14218, 5" thick, 8" wide, 14" case length, 20" overall)
ARP head bolt kit (with hardened washers)
Crane gold race aluminum 1.73:1 351C 7/16" stud mount roller rockers

A picture of the some of the engine parts:



I had some of the parts in my stash and Brent Lykins supplied the internally
balanced stroker kit while Alex Denysenko supplied the rest of the bits.
This engine will initially go into my white 1974 DeTomaso Pantera L but
will likely end up in my 1956 F100 project truck (whenever I get around
to it). The white Pantera is strictly a street car and is a nice weather
daily driver. The goal is similar to the 408C we did for Mike Drew's
Pantera (peak around 6000 RPM with excellent street manners and reasonable
fuel economy). Mike's engine made 526 HP and 500 ft-lbs through the dyno
mufflers and he reports 18 MPG tearing through the mountains at 80+ MPH so
we think it could do 20 MPG during a level terrain cruise). Anyway, that's
the benchmark to beat.

I designed the hydraulic roller cam using Dynomation and crossed it against
the Bullet lobe catalog. Specs are:

293/298 degrees advertised duration
238/242 degrees duration @ 0.050" lift
0.640"/0.574" lift (with 1.73:1 rocker ratio)
110 lobe separation angle
Bullet CRA type intake lobe HR293/370
Bullet CRS type exhaust lobe HR298/332

Type CRA which means a grind with a conventional nose (as opposed to a nose
designed for a lift-rule race class), a lobe shape good for RPM and/or high
lift rockers (applies to 351C's 1.73:1 rocker ratio) and asymmetrical
opening/closing (helps with valve bounce). CRS is the same but with a
symmetric lobe. The flow numbers used for the cam design were gathered
without a pipe extension which biases the design for more exhaust duration
than if they were flowed with a pipe (adds approximately 30 CFM). If I had
it to do over, I'd probably shorten the exhaust duration a bit.

There are some issues to be aware of when running a hydraulic roller cam in
a 351C block. It varies from block-to-block and depends upon the size of the
chamfer at the top of the lifter bore but, on many blocks, the oil feed is
exposed at maximum lobe lift. Here's a shot of the lifter bore chamfer:



Some manufacturers (like Comp) will reduce the base circle of the cam so the
OEM type lifters can be used. As a rule, irregardless of how much lift that
a camshaft has, the lifters generally all stop in approximately the same
location at the top unless the base circle is deliberately reduced which can
cause problems at the other end of the lifter bores. With a reduced base circle
cam, the OEM lifters will usually be safe at maximum lift but some blocks will
have interference problems with the dogbones. A local shop has a fixture to
machine the block for clearance but it can also be done by hand. Comps link bar
lifters have the oil feed (and associated band on the lifter) in the same place
as the OEM lifters so can have problems at max lobe lift when used with a
standard base circle cam:

The Crane link bar retrofit hydraulic roller lifters:



have the oil feed placed lower on the lifter body and do not have the max lift problem.
The Lunati hydraulic roller lifters (made by Morel) cost about half what the
Cranes do. Tim Meyer sent me a pair and I verified the oil feed hole is in
the same place as the Crane so they should work but they are heavier and may
not turn quite as much RPM. Gaterman also makes a clone of the Crane lifters
which cost about half as much. I think Erson's street SBF hydraulic roller
link bars are the Morels and should also work. Be aware there are some Chinese
knock-offs of the Cranes that should be avoided.

We have several sets of Ford Motorsport A3/C3/C302/C302B high port aluminum
Cleveland heads available for testing, along with with matching intake
manifolds and exhaust headers. Some of the heads have stock chambers
(Cleveland quench chambers) while others have been clearanced for domed
pistons so the compression ratio will vary but should be in the 10:1 range.
We won't test them all but here is the head line up that we have to choose
from:

1. large port A3 (unported but smoothed, early exhaust bolt pattern)
2. large port A3 (some port work but not flow tested, late exhaust pattern)
3. E2ZM-6090-A3 Phase 1 1/2 (2.19/1.71, narrow C302 intake port, larger A3
oval exhaust, D shaped chambers, dated 11/15/83D and 11/14/83N)
4. E3ZM-6049-C3 (unported but smoothed, oval exhaust port)
5. E3ZM-6049-C302B (ported but small port, late flange, common height
bosses, ex-Alan Kulwicki, still need to flow bench test)
6. E3ZM-6049-C3 (2.15/1.65, ported, unshrouded, intermediate intake port,
D-shape exhaust port, short boss, late exhaust flange, currently has
Windsor coolant routing, dated 4/23/86N)
7. E3ZM-6049-C302B ported (larger intake ports, rectangular exhaust ports,
late flange, common height bosses)
8. E3ZM-6049-C302B ported tulip head exhaust valves, best flowing of all
the heads, on Fontana short block but not torqued down

For the large port A3 heads, the intakes available for testing include:

1. A331 Edelbrock low rise single plane (A3 port version of the Torker)
2. A331 Edelbrock low rise single plane (modified with plenum extensions)
3. Scott Cook low rise dual plane (looks like Ford Boss 351 intake, CHI 3V port)
4. CHI 3V single plane tall single plane (4150 flange version)

We can also run the smaller port C302B intakes on the A3 heads. For the
smaller port C3/C302/C302B ports, the intakes available for testing include:

1. Roush A331 unported
2. Roush B351 unported
3. Roush B351 ported (ex-Alan Kulwicki)
4. Edelbrock D351 unported

Headers available include:

1. Precision Proformance 4-into-1 shorties for 9.2" deck block with high port
heads in Pantera chassis, slotted to fit both early and late high port
flange patterns, fits either A3 or C3/C302/C302B heads (2" OD, 1 7/8" ID
primaries with lengths that vary from 12" to 20" long, collector ID is
2.39" and length is 6")

2. 180 degree Pantera headers for 9.2" deck block with C3/C302/C302B heads,
Mad Dog's old headers

3. Stainless steel full length tri-y's for small port late model flange only,
1 3/4" OD first pair, 2" OD second pair with 2.5" diameter collectors

4. Circle track high port headers, upper bolt holes elongated to fit both
early and late bolt patterns, stepped tubes with bolt-on 3 1/2" collectors,
3 1/2" diameter extensions

Mufflers are 2.5" single inlet/dual outlet Magnaflow mufflers and all dyno
runs will be through mufflers unless otherwise noted.

I went with internal balancing as I already had a neutral balance aluminum
flywheel (a NOS Scheifer unit I got cheap because it was Ford 300 truck
inline six part). Since we were internally balancing, we chose SCAT's
I-Beam rods over the heavier H-beam rods as the light rods require less
Mallory metal in the bob-weights. Diamond had an off-the-shelf piston for
the combo to round out the stroker kit.

The oil is a special blend for hydraulic rollers that reduces the leakage
rate and meant to be used with pre-load set to zero lash. Out-of-the-box,
the carburetor was really rich with poor idle and part throttle but ran fine
at wide open throttle. The QFT SS series carbs have replaceable idle feed
restrictions so Dave reduced them to cure the problem.

Ford Motorsport used to offer the M-6065-A351 head bolt kit (1/2" diameter
bolts that are 1" longer than production 351C bolts, with hardened washers)
for installing SVO high port aluminum heads on 351C iron blocks but they are
no longer available. I ordered what was supposed to ARP's equivalent kit
but only half of its bolts were the correct length so Dave sourced replacements
for the other bolts. I've since found an M-6065-A351 bolt kit.

Also obsolete is the FRPP snout spacer part number M-19009-A341C which
is required with 351 SVO crankshafts used in iron 351C blocks. Dave had
one he measured:

0.400" thick
1.830" OD
1.360" ID
45 degree chamfer about 0.125" wide on one end of the ID

and makes spares as he needs. They only need to be a slip fit. After
he made mine, I found several spares at a local machine shop.



The first set of heads tested are the unported but cleaned up A3's which were
mated to the Pantera shorty headers and an A331 intake manifold. Here's a
picture of the first top end set up to be tested (A3 heads, Edelbrock A331
and

http://i1127.photobucket.com/albums/l621/danielcjones2/351%20Cleveland%20Stuff/
A3_heads_A331_intake_QFT_carb_PPC_headers.jpg

Dave did some plenum work and added runner extensions to the intake to try to
get it to tune to a lower rpm which appears to have worked. Dave's dyno is
known to be 4% to 5% conservative compared to the calibrated Engine Masters
dyno (verified on Dave's 351C and 460 based EMC entries). Adjusting for that,
the A3 and A331 top end made 560 HP @ 6300 RPM and 512 lbs-ft @ 4900 RPM
through the 2 1/2" single inlet/dual outlet Magnaflow mufflers. HP hung in
until 6500 RPM and then started to drop off and it liked approximately 36
degrees total timing and a 1 inch open spacer under the carburetor. Dave said
he's going to mess with the jetting a bit more and then switch to the Cook
dual plane intake manifold. Removing the mufflers was worth about 10 lbs-ft
and 5 horsepower so not too bad but could probably benefit from a cross-over.

A promising start, given that Dynomation predicts the smaller ported heads to be
better by 20 to 35 HP. Info on the first set of heads tested:

A3 Ford Motorsport High Port Heads minor clean up, 2.19 intake, 1.71" exhaust,
2.74 square inches minimum intake port area, 1.88 square inches minimum exhaust
port area, intake port 2.125" H by 1.725" wide (3.665 square inches), exhaust
port 1.65" H by 1.725" wide (2.27 square inches), tested on Dave McLain's
SuperFlow flow bench at 10" and converted to 28". Clayed intake radius but no
exhaust pipe. As with most of the Cleveland heads we've tested, they generate
little to no swirl motion.

Lift Int Exh
Inches CFM CFM
0.025 15.7 11.7
0.050 34.6 28.1
0.100 65.5 56.7
0.150 95.2 87.5
0.200 129.2 109.8
0.300 188.8 142.4
0.400 242.8 167.0
0.500 287.7 186.7
0.600 321.4 204.4
0.700 337.7 216.3

Note: Dave's bench tends to be conservative compared to others I've tested the
same heads on (by 20 CFM or so) on but gives good results in Dynomation. These
numbers are very similar to what CHI-3V and CHI-4V heads produced on Dave's
bench.

Externally, the Edelbrock A331 looks like a Torker:



but has smaller A3 ports and no cross-over:



You can see how much smaller the A3 port is here:



That's a 4V gasket on top of an A3 port. What's not obvious is the A3 roof is higher
(obscured behind the gasket).

You can clearly see the evolution of the high port heads here:



On the left is an iron 4V modified with an aluminum high port exhaust port plate like
they ran in Pro Stock. You can see the lower edge of the original exhaust port (painted blue).
In the middle is an A3 port which is slightly higher with a more uniform round shape, instead
of the weird area changes of the iron 4V port. At the right is a ported C302B. The C302B
ports start out much smaller as you can see from this scan from an old Ford Motorsport
catalog showing a comparison of C302, B351 and A3 high port heads:



The same heads as above on the intake side:



and the chambers:

http://i1127.photobucket.com/albums/l621/danielcjones2/351%20Cleveland%20Stuff/
351C_head_comparison_A3_4V_C302_chambers_cropped.jpg

High ports share the quench 4V chamber design. The C302B head on the right has been
clearanced for a domed piston. High ports were also designed to be run on both
WIndsor and Cleveland blocks. Here are the instructions that came with the A3
heads:





Dan Jones
 

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Discussion Starter #2
We tested a Scott Cook aluminum dual plane intake on the 403C with A3 heads. I forgot
to snap a picture before dropping it off at the dyno so I grabbed a couple from the
Cleveland Wiki:




Scott's manifold looks much like a Ford cast iron DOAE-9424-L dual plane but
is cast in aluminum, slightly taller (around 10 mm or a bit more than 3/8")
with smaller ports that are sized more like a CHI 3V. Luckily the intake
was also designed to fit a 4V iron heads (port stuffed or not) so also
fits the A3 high port heads. Like the over-the-counter version of the
Boss 351 intake, it has two oval holes in the carb flange instead of the
four circular holes of the iron Ford intake. The one tested is one of
Scott's first generation intakes which he has since redesigned to work
better on larger displacement engines with good flowing heads. Given that
it's the earlier design, both Dave and I thought it might be out of its
element on my 403C but it surprised us. The dyno fuel log wouldn't clear
without a spacer so it was run with a couple of different 1" spacers,
making the best HP with HVH 4 hole spacer registering 569 HP @ 6350 RPM
and 511 ft-lbs @ 4750 RPM. Switching to a 1" open spacer, increased peak
torque to 514 ft-lbs @ 4700 RPM but HP wasn't quite as good. Pop the
mufflers off (or use the larger 3" inlet/outlet Magnaflows) and it might
make 575 HP with a street hydraulic roller. Not too shabby.

Paint the A3 heads and Cook intake Ford blue and no one would know it's not
a stocker. In fact, that set up would fit under the hood of my 1966 Mustang
fastback but would require notching the shock towers for high port header
clearance. The 225/60/15 tires would not be happy :)

We tried testing a CHI 3V high rise single plane which had picked up 20 HP
over the Scott Cook intake on a milder 400+ HP 351C but couldn't get it to
fit correctly on the A3 heads. We're going to a Roush B351 single planes.
Not sure if it will fit as it was designed for C302 heads.

Dan Jones
 

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i worked for Charlie Kemp back in 1980. Kemps cobra II had a Gapp & Roush 358C with iron 4V heads anf the aluminum exhaust port plates. iirc it made over 650 hp at about 6500 rpm. i was thinking of putting a set of c302b heads on my 392w. i know where a nos set is. i'm currious as to how the c302b would compare to the a3 on the same engine.
 

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Discussion Starter #4
> i'm currious as to how the c302b would compare to the a3 on the same engine.

The C302B's have the smallest ports of the high port family and were designed
to be ported. If they are NOS heads that have never had any work done to them,
they will need at least a bowl porting/blending. There's a fair size mismatch
under the valve seats. Ford left a lot of material there and in the ports to
allow more freedom in custom porting. The larger port A3's flow better out of
the box but the C302B can make big flow numbers (and power) when ported. For
my dyno testing, the A3's have had the bowls blended but no port work other
than a cartridge roll clean up. I have a set of C3's that have had a similar
treatment and should provide a good comparison. My guess is the small port C3's
would work better on a 351C than my 403C but we'll see what the dyno says.
I also have a set of ported C302B's to test. Because of the difference in
the size of the ports, there are intake manifold differences so it will be
interesting to see if a better intake can make up for the smaller port lower
flowing heads.

Flow numbers for bowl blended high port heads:

Valve E3ZM-6049-C3 M-6049-A3
Lift Intake Exhaust Intake Exhaust
(inch) 2.15" 1.65" 2.19" 1.71"
0.025 13.0 10.6 15.7 11.7
0.050 31.9 26.8 34.6 28.1
0.100 64.1 60.8 65.5 56.7
0.150 99.3 89.9 95.2 87.5
0.200 138.2 108.9 129.2 109.8
0.250 171.3 128.0 161.5 121.9
0.300 200.3 141.8 188.8 142.4
0.350 223.1 156.5 216.4 154.5
0.400 243.8 168.5 242.8 167.0
0.450 260.0 177.0 265.6 177.7
0.500 274.8 183.7 287.7 186.7
0.550 287.3 189.3 305.8 195.9
0.600 293.9 193.1 321.4 204.4
0.650 295.6 196.2 331.2 211.7
0.700 305.0 199.5 337.7 216.3
0.750 313.8 202.2 317.6 221.8

Tested on Dave McLain's flow bench at 10" and converted to 28"
Clayed intake radius, no exhaust pipe. Note that McLain's bench
is conservative compared to other benches I've used by 20 to 30 CFM.
CHI 3V's did not flow as well as these heads on the same bench.
FWIW, my best ported C302B's are better than the A3's with smaller
ports.

Dan Jones
 

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Ford 4V Closed Chamber Ported BH Performance IronN/A-
-
No Pipe
N/A
,1 70/64

.2 131/107

.3 198/145

.4 248/169

.5 300/192

.5 322/200

.6 330/-200

Heads I did for friends Pantera. Some more info our bench compaired to most reads around 20cfm low near max at this level so on most other benches max CFM would read 350/220.
 

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i wonder how a set of ported c3 or a3 heads would work on a 311 inch boss 302 designed to turn 9000+ rpm. i'm going to be building one and would prefer the aluminum heads over the cast on for my roadrace mustang to keep the front end light. its in the planning stages and the only parts i have are a new ford racing boss 302 block , 5.15 Bod Moore Crower rods, Bryant Racing 3" stroke crank. boss 302 factory intake. a friend has a set of 70 b2 heads but they do weigh a lot, i have owned 3-351c 4v engines.
 

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Discussion Starter #7
Here are flow numbers for a set of iron closed chamber 4V heads we did for
a Pantera 408C:

351C-4V
lift int exh
.050 32.7 27.1
.100 64.6 55.9
.200 129.8 100.1
.300 195.1 138.9
.400 251.7 166.4
.500 296.5 182.7
.600 322.5 186.5
.700 338.9 185.2

We didn't do much work on the exhaust and your results are clearly better there.
Ours were flowed at 10" and converted to 28", 2.19"/1.71" diameter valves,
no intake manifold or exhaust pipe. Intake port area is 3.25 sq. in. Exhaust
is 3.14 sq. in. Dave McLain talked with Jon Kaase (Jon was Dyno Don's crew
chief back in the 351C Pro Stock days) before working on these heads and Jon's
recommendation was to spend the time on the short side radius as that was
where the biggest payoff was. These heads got a standard valve job and only
short side radius work. Pretty good results for the $150 labor charge. Dave
did a second set that weren't quite as good as these because the heads had a
couple of prior valve jobs.

Ported, the A3's can make some big flow numbers. Here are the numbers from
one of the guys (Tim a.k.a. Drag Boss on 335 Series Engine Forum) A3's:

Lift Intake Exhaust Exhaust w/tube
(inch) 2.19" 1.71"
0.100 68.3 61.7 63.0
0.200 137.1 106.5 109.1
0.300 204.6 146.2 150.2
0.400 258.2 178.2 184.4
0.500 316.2 207.4 217.7
0.600 345.1 233.3 247.6
0.700 362.3 246.9 264.4
0.800 375.0 252.5 276.2

A3 heads
4.060 bore tube
28" H2O

Even with similar flow numbers, the smaller port A3 heads do seem to make
better power than the iron 4V's. They don't have the weird area changes
and come on cam earlier. A friend did a back-to-back test switching from
iron 4V closed chamber heads and Holley Strip Dominator intake to C302B
heads and Roush A331 intake. Nothing in the short block changed: 351C
with TRW L2379F flat top pistons, Isky Mega 280 hydraulic flat tappet cam
232 degrees @ 0.050", 0.565" lift, 108 lobe separation). The headers were
changed to match the high port exhaust ports but both headers were similar
Pantera shorties and the mufflers/tailpipes remained the same. The engine
started pulling more that 1000 RPM earlier with better peak power too.

> i wonder how a set of ported c3 or a3 heads would work on a 311 inch boss
> 302 designed to turn 9000+ rpm. i'm going to be building one and would
> prefer the aluminum heads over the cast on for my roadrace mustang to keep
> the front end light. its in the planning stages and the only parts i have
> are a new ford racing boss 302 block, 5.15 Bod Moore Crower rods, Bryant
> Racing 3" stroke crank. boss 302 factory intake. a friend has a set of 70
> b2 heads but they do weigh a lot, i have owned 3-351c 4v engines.

Circle track guys like the C3/C302/C302B over the A3's because they have
better throttle response. The drag racers, especially with larger
displacements, really like the A3's. The C3/C302/C302B heads are the hot
ticket for the smaller displacement engines and were the head of choice
for Trans Am racing in the 1980's and early 1990's. I've got a 1985 Ford
Motorsport catalog which details an 310 cubic inch Roush Trans Am road race
engine that used ported C302B heads and a M-9242-B302 intake manifold (for
8.2" deck block with high port heads). It's a very detailed build with
clearance specs and even the carb specs down to the air bleeds. If you
send me your email address I'll make you a copy. My scanner is down at
the moment so I may have to snail mail it.

Dan Jones
 

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i wonder how a set of ported c3 or a3 heads would work on a 311 inch boss 302 designed to turn 9000+ rpm. i'm going to be building one and would prefer the aluminum heads over the cast on for my roadrace mustang to keep the front end light. its in the planning stages and the only parts i have are a new ford racing boss 302 block , 5.15 Bod Moore Crower rods, Bryant Racing 3" stroke crank. boss 302 factory intake. a friend has a set of 70 b2 heads but they do weigh a lot, i have owned 3-351c 4v engines.
the Boss302 intake (oem) is not a good fit to the Fords SVO/Racing heads and most aftermarket heads
 

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the Boss302 intake (oem) is not a good fit to the Fords SVO/Racing heads and most aftermarket heads
thanks for the info. a friend has an old ford motorsports "open plenum victor style" intake he bought to put on his factory 70 boss 302. he never used it and its for an 8.2" deck block. i asked if he wanted to sell it and he said he's thinking about it. its for c302 heads. another guy i know knows where a set of yates c302b heads are. the guy that does my machine work has a new set. i taled to Stan at FPA and he said he's made about 10 sets of high port headers to fit a mustang with an 8.2" block. he did tha 1.75". my welding has gotten really good so i may build a set. i'll wait and see what Roush did.
 

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thanks for the info. a friend has an old ford motorsports "open plenum victor style" intake he bought to put on his factory 70 boss 302. he never used it and its for an 8.2" deck block. i asked if he wanted to sell it and he said he's thinking about it. its for c302 heads. another guy i know knows where a set of yates c302b heads are. the guy that does my machine work has a new set. i taled to Stan at FPA and he said he's made about 10 sets of high port headers to fit a mustang with an 8.2" block. he did tha 1.75". my welding has gotten really good so i may build a set. i'll wait and see what Roush did.
I also have a set of CHI 185 cc port heads for sale . walls have enogh meat to open for a much larger port .

BTW there is no such head as a Yates C302 ..its SVO C302
 

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this is one of the no longer made crower heavy duty rods with sps through bolts. 5.15" and bushed on the pin end and takes standard off the shelf 289/302 inserts. i got these from a freind who knows Bud Moore and bought these and a whole bunch of other Bud Moore b302 race engine stuff. the rods i bought are new in the box, never used. i wanted real good stock lenght b302 rods. i just want to build a high winding powerful 3" stroke engine. i already have 2-392W low rpm strokers. i can run the 302 in a local 311 & under roadrace class with c302b heads.
 

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Discussion Starter #13
> the Boss302 intake (oem) is not a good fit to the Fords SVO/Racing heads
> and most aftermarket heads

Correct. The Boss 302 has a 4V port where the C3/C302/C302B high port
heads have a smaller intake port. One aftermarket head that will work
with the Boss 302 would be a CHI 4V.

> a friend has an old ford motorsports "open plenum victor style" intake he
> bought to put on his factory 70 boss 302. he never used it and its for an
> 8.2" deck block. i asked if he wanted to sell it and he said he's thinking
> about it. its for c302 heads.

The correct intake manifold for C3/C302/C302B high port heads on an 8.2" deck
(302) block is the M-9242-B302. Be aware that Ford re-used the part number
for a similar intake that matched the early Yates C3/C3L heads. The ports
look similar but are shifted fore-and-aft from those of the high port intake.
The M-9242-B302 would not seal against a Boss 302 head unless the intake ports
were stuffed (Roush or similar port stuffers).

I know a guy who had three custom sheet metal 8.2" deck C3 IR EFI cross ram
intakes for sale. If you're interested, I can contact him to see if he still
has one.

> I also have a set of CHI 165 cc port heads for sale.

Do you mean 185cc CHI (Storlien port)?

> BTW there is no such head as a Yates C302 ..its SVO C302

Also be aware there are both Yates C3 heads and high port family C3 heads.
The high port C3's are essentially the same as C302 and C302B heads and
share Cleveland valve train and are compatible with Boss 302 and 351C pistons.
The Yates heads require a rockershaft system and custom pistons.

Dan Jones
 

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Dan the intake my friend has is a M-9424-B302. I will have to check the intake ports to make sure they line up. Thanks for the info on the Yates heads. The heads I'v located are Ford C302B not Yates. I'm going to have JE pistons custom make the pistons.
 

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Ported heads I gave the flow numbers were the ones for my friends 351C that put out 500 HP @ 6000 and 500 ft bls @ 4200 using a hogged out torker. Best I could do with the torqerr was 270 or 280 CFM bolted to the head.

At the same time was porting a set of Yates heads dont remember which ones. They flowed 360 possibly could have hit 400 with some more work.
They had 0 turbulance at that point the quietest set of heads on my bench I can remember.
 

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Does anyone have fotos of the Roush and Yates 8.2" deck M-9424-B302 intake for comparison ?
 

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Discussion Starter #17
> Dan the intake my friend has is a M-9424-B302. Thanks for the info on the Yat◆
> heads. The heads I'v located are Ford C302B not Yates.

Those will work. Refer to the Ford Motorsport instructions scanned in above
for setting the heads up to run on a Windsor block.

> Does anyone have fotos of the Roush and Yates 8.2" deck M-9424-B302 intake
> for comparison ?

I don't have anything scanned in but there are photos is older Ford Motorsport
catalogs.

Dan Jones
 

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Dan Jones , the CHI 3v"s are 185's . I should proof read
 
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