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  Topic Review (Newest First)
12-04-2018 05:17 PM
Molon Labe
Re: Questions for 351W Experts

I may have solved the mystery. I believe it's a "Lightning" engine from a '94 F-150. I discovered the "NHRA Technical Specs" and looked up í94 Ford 351W Truck Engines. This is reported to be the ďBibleĒ for factory specs and it lists two 351W engines for '94 trucks; one at 195 hp and one at 240 hp (the Lightning) and the 240 hp version is zero deck clearance. Both engines had the same pistons with a volume of 18.7 cc but different cams and heads.
12-03-2018 01:24 PM
GT350HR
Re: Questions for 351W Experts

Yes it would have to be an aftermarket head for sure. The cost of porting a stock 351W head is MORE than the cost of the lowest flowing aluminum head ! The ONLY reason I would use a ported 351W head is when a racing class required it.
Randy
11-30-2018 02:45 PM
n2omike
Re: Questions for 351W Experts

Quote:
Originally Posted by GT350HR View Post
Molon Labe ,
If you want more torque , run a small cam and cylinder head. If you want to keep your T5 and 8" alive drive it with respect for their weakness. No dumping the clutch ar "banging" shifts. Shock loading kills parts unless they are up to the power level. 350hp is simply a mild cam and aluminum intake with headers on a 351W.
Randy
Don't need small heads. Just don't use heads that are WAY oversized. You want plenty of head, just not toooo much. Too small of a head only restricts things. Stock heads on any SBF only serve to kill power... everywhere.

And, yes... Shock loads, slicks and wheel hop are what kill parts. As long as you use standard radials and resist the urge to side step the clutch, you should be fine.

Good Luck
11-30-2018 12:34 PM
GT350HR
Re: Questions for 351W Experts

Molon Labe ,
If you want more torque , run a small cam and cylinder head. If you want to keep your T5 and 8" alive drive it with respect for their weakness. No dumping the clutch ar "banging" shifts. Shock loading kills parts unless they are up to the power level. 350hp is simply a mild cam and aluminum intake with headers on a 351W.
Randy
11-29-2018 07:02 AM
n2omike
Re: Questions for 351W Experts

Quote:
Originally Posted by Molon Labe View Post
Thatís actually more HP than Iím looking for. Iíd be concerned about the T-5 and 8Ē surviving. I think Iíd best keep it around 350 HP. Iím old school and love the sound of a rough idle. I realize thatís harder to achieve with a roller but thatís more important to me than making extreme HP. Typically an engine with a rough idle lacks low end torque and makes itsí HP at high rpmís where I donít expect to spend much time. Since this is a cruiser Iím going to want that low end torque. I may have to re-think my game plan.
Look at Comp Cams 'Thumper' series. These have tighter lobe separations, and produce a rougher idle for a given rpm range. You can get a nice, thumpy idle... and still not have to rev it to the moon. They actually make really good midrange power.
11-29-2018 07:00 AM
Molon Labe
Re: Questions for 351W Experts

Thatís actually more HP than Iím looking for. Iíd be concerned about the T-5 and 8Ē surviving. I think Iíd best keep it around 350 HP. Iím old school and love the sound of a rough idle. I realize thatís harder to achieve with a roller but thatís more important to me than making extreme HP. Typically an engine with a rough idle lacks low end torque and makes itsí HP at high rpmís where I donít expect to spend much time. Since this is a cruiser Iím going to want that low end torque. I may have to re-think my game plan.
11-28-2018 12:32 PM
GT350HR
Re: Questions for 351W Experts

My 408 is similar . '94 roller block , 9.7 cr , Ford X cam , X GT40 alum heads, Eddy air gap , long tubes , '67 Ranchero , auto , 9" 3.5 ratio. It made 480 ( engine dyno) on 87 so you should make 400-440 with ease. 10.7 with premium and more cam could go nearer to 500.
Randy
11-27-2018 05:42 AM
Molon Labe
Re: Questions for 351W Experts

I measured everything and it all appears stock - deck height is 9.503" and rods are 5.956Ē. It seems the pistons are the oddball with a compression height of 1.797". They have the oval dish like originals. Bores and crank have never been touched. So far, I havenít been able to find any mention of a piston with this compression height but itís academic as Iíll be changing the pistons anyway.

Iím planning to use Promaxx 9175 heads with 60 cc chambers and 185 runners, a Typhoon intake with a Holley 750, long tube headers. Not sure of compression ratio but shooting for around 9.5. Iím not locked in on the cam yet but Iíve been advised a Howards CL221275 with 270į/278į advertised and 217į/225į @ .050Ē and 110į LSA would be a good choice. That gives .528Ē/.533Ē lift with 1.6 roller rockers.

Itís going into a í67 Fairlane coupe with a T-5 and an 8Ē Trac Loc. I had to repair a lot of rust including the driverís torque box and all new floor pans. Iíve restored English sports cars before but this is my first effort at a muscle car since my í55 Chevy back in the late Ď60ís. Itíll just be a cruiser with an occasional run up through the gears but no track time.

I tried to post to the SBFTech site but I think that site may be inactive.
11-24-2018 02:12 PM
DIAMONDBACK
Re: Questions for 351W Experts

Quote:
Originally Posted by Molon Labe View Post
I was answering the reply from Diamondback. Didn't see your post until after I answered him. Thanks for your feedback. I've ordered a 12" caliper.
Sure you didn't see his post!! Lol Joke. Keep us posted and let us know what it specs out at. Also, what are your plans for the engine?
11-23-2018 04:39 PM
Molon Labe
Re: Questions for 351W Experts

I was answering the reply from Diamondback. Didn't see your post until after I answered him. Thanks for your feedback. I've ordered a 12" caliper.
11-23-2018 06:13 AM
n2omike
Re: Questions for 351W Experts

Quote:
Originally Posted by Molon Labe View Post
Yes, but what I'm trying to figure out is how can I measure that in my garage with basic machinist measurement tools.
I just told you how.
You'll need something that will measure down to 0.001"... while reaching out close to 10 inches. You will also need to measure the block's main bore to the same precision. The tool you need is a decent quality 12" dial caliper. It's a pretty basic tool. I have a nice Mitutoyo unit, and use it all the time.
11-22-2018 04:32 PM
Molon Labe
Re: Questions for 351W Experts

Yes, but what I'm trying to figure out is how can I measure that in my garage with basic machinist measurement tools.
11-22-2018 09:58 AM
DIAMONDBACK
Re: Questions for 351W Experts

Quote:
Originally Posted by Molon Labe View Post
Yes, my block is a roller. Also, I'm trying go figure out how to measure the deck height, compression height and rod length with the tools I have. Pretty basic stuff.
Your deck height would be measured from crankshaft/journal center line to surface deck of where the heads mount? Thoughts?
11-22-2018 07:10 AM
n2omike
Re: Questions for 351W Experts

You'll need precise tools to get a good measurement of deck height. You can get a good approximation using a GOOD 12" dial caliper. Use it to measure the distance from the main bore to the deck... then add half the main bore diameter. This will give you the deck height... or the distance from the crank centerline to the deck.

That being said, it is what it is. If you've got a nice, crack free, standard bore roller block, you're doing well. If the deck turns out to be shorter than you hoped, it's no big deal. People make things work, even when the pistons are sticking 0.020" out of the bore by using extra thick MLS head gaskets.

Good Luck!
11-21-2018 05:18 PM
Molon Labe
Re: Questions for 351W Experts

Yes, my block is a roller. Also, I'm trying go figure out how to measure the deck height, compression height and rod length with the tools I have. Pretty basic stuff.
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