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Discussion Starter · #1 ·
Ok heres what Im thinking. 351 Windsor roller block stroked to 393 or 408. Forged pistons about 9.5-1 CR. Iron Windsor Jr heads gasket matched and bowl blended. Cam in the 218* range 510 lift. Stealth intake, holley 670 carb. MSD ignition. Hooker comp headers 2.5" dual flowmasters.
Want all the torque between 1500 - 3000 rmps. redline about 5700 rpms. What numbers am I looking at and what would help. Suggestions are very welcome.
 

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The Windsor Jr heads are way too small for that motor.
You need heads that are at least equal to the AFR 185 CNC heads IMHO....
 

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I have something close to what you're talking about- 351W stroked to 426. Edelbrock perf. rpm intake, 750cfm carb. Mild tappet cam with Twisted alum heads. Hooker super comps to 3" flowmasters(pass side hangs too low). 390hp/545tq dyno'ed at the wheels. Tabletop torque curve from about 1500-4200 rpm. When I got it dyno'ed I thought the hp would be better though. Maybe a new cam, intake and efi can help get more mid to top end range. Good luck.
 

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Discussion Starter · #4 ·
Maybe the AFR 185's for higher rpm HP but I was thinking of keeping the velocity up with the smaller intake runners. MAYBE?
 

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On 2006-04-09 18:17, chas319 wrote:
Maybe the AFR 185's for higher rpm HP but I was thinking of keeping the velocity up with the smaller intake runners. MAYBE?
Windsor Jr.s have 180cc intake ports... AFR 185s are only 5ccs bigger but flow WAY better, so your peak torque will probably be way up and top end will be much stronger too compared to the Jrs.
 

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Windsor Sr.s (or the newer Roush 200's) give you a bit more runner volume, and cleaned up can give you great flow. Not to mention they're a sight cheaper than the AFR's.

The Jr.'s just dont have enough for a stroked 351. If you've got the pockets, go for the AFR's. But a good budget torque build is possible with the Sr.'s
 

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Discussion Starter · #7 ·
Well See I have a AFR 185 headed 347 now but I have some jr's laying around. The 347 is in my 4x4 and I dont think Im going to get what I want out of it. So Maybe 408 with afr 185's? Then put the jr's on the 347. The 347 is all forged with 10.7-1 CR.
I just want all the torque I can get . What do I need to do?
 

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Discussion Starter · #9 ·
Im just trying to see if the higher velocity of the smaller runners will be able to make the torque im looking for.
 

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You have to walk the fine line between efficient cylinder filling and not choking off what the motor can use.

With ~400ci I say go with heads that have great flow in the .050" to .450" lift range, and have runners in the 185 to 205 range. Let the small cam dictate your torque peak and aggressive dynamic cylinder pressure. And remember, the more compression, the more torque you will produce.

The Windsor Jr's are a poor choice for what you want to do. Even ported they will not be able to properly feed that much displacement.

My choice-

408
Twisted Wedges- ported if possible (Aluminum and a great combustion chamber shape let's you run more compression)
10.5 to 1
RPM Air Gap matched to the heads (Stealth is also good choice)
Comp Cams Xtreme Energy- ~220/224, 112 LC and .530" lift
Long Tube headers
 

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Discussion Starter · #11 ·
FASTER:
Sounds like a good combo but then Why does my 347 AFR 185s 10.7-1 CR Perf. intake, 218* Cam Just not have any grunt under 3200 rpm's?????
I would have thought it would have had alot more when I built it. But its kinda dissapointing.
 

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On 2006-04-11 21:50, chas319 wrote:
FASTER:
Sounds like a good combo but then Why does my 347 AFR 185s 10.7-1 CR Perf. intake, 218* Cam Just not have any grunt under 3200 rpm's?????
I would have thought it would have had alot more when I built it. But its kinda dissapointing.
Sounds like fuel starvation or timing. Should rip the hides off...
 

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What is the complete combo?

Has it been run on a dyno- engine or chassis? Are you sure it is properly tuned for Air/Fuel ratio and timing?

If torque right off idle is your goal, the bigger displacement will really help. You can throw a stock HO 5.0 cam in your 347 and see if it feels the way you want it to. It is 210* w/ ~.440" lift (.477 w/ .7 rockers). Also- the longer the intake runners the better for torque- so a swap to EFI and the looong runners would also make for fat bottom end torque.

As for the heads on the 347- AFR165's would have been a better choice for your goals. Does it run hard above 3500? It should go like stink.
 

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Question for the moderator and anyone eavesdropping: how sensitive are strokers to LSA? Intuitively, it seems like it should be less, with the greater displacement, and harder 'pull' at the valve when it starts to crack open.

As for the engine being a dog under 3500 rpm, what chassis, gear, trans, convertor, tire, GVW are you running with it? And to Jim's question, what tuning, ignition, etc have you done to it? The engine is part of a whole system, and things that would work in a 3000#lb. Mustang will make a 4500#lb. Effie lay down and die.

Good luck
 

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Discussion Starter · #15 ·
Ok complete engine. 86 roller 302 block stroked and bored to 347. Forged crank, h beam bods, forged pistons -5cc (.010 above deck).
Cam- crane powermax hyd. roller adv. 262* / 270* .530 lift
Heads Afr 185 stock, roller rockers 1.6
Performer RPM intake 1" 4 hole spacer, Edelbrock 650 carb.
MSD 6A ignition, blaster coil, Pro billet dizzy mech, advance. 8* initial 28 total by 2300 rpm's on 91 octane any more and it pings.
high volume oil pump, nascar style mech. fuel pump puts out 14 psi, regulated to 5.5 psi 3/8 line.
Hooker headers, 2.5" flowmaster 40 series exhaust.
C6 trans, stock converter, 35" tires 4.11 gears lockers.
Went with the 185 heads for future use and I was gonna make this a car engine.
Still thought it would have made decent power.
3500 rpm's and up it pulls pretty good to 5400.

No dynos yet. daily driver 12 mpg. Played long and hard on timing and this is the best I could get plugs look good and no fouling.


_________________
82' F150, 6" lift, 35's, 4.11's and locked. C-6 shift kit. 347, AFR185's w/ all the other goodies.

<font size=-1>[ This Message was edited by: chas319 on 4/14/06 11:38am ]</font>
 

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12 MPG sounds about right for that combo - I get 12.33 avg with a smaller cam and bigger heads. (Roush 200's) on my 302.

You probably have better vacuum than me though, what is yours, around 10-12"?
 

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Discussion Starter · #17 ·
vaccume is at about 13.5 " Runs good up high just sluggish down low.
 

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Discussion Starter · #18 ·
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