Questions for 351W Experts - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 17 (permalink) Old 11-21-2018, 12:33 PM Thread Starter
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Questions for 351W Experts

I bought a used engine that allegedly came from a '94 pick-up. Block is F4TE 6015 A4-9. I'm in the process of dismantling it and have been amazed at how clean it is inside. Before pulling the pistons and crank I checked the deck clearance. I believe a stock 1994 Ford 351W deck height is 9.503Ē, compression height is 1.774Ē, rod is 5.956Ē and stroke is 3.500Ē which gives a deck height clearance of .023Ē in stock form. I'm measuring zero on this engine with some pistons actually .002" above the deck.

My first thought was that this engine is so clean because it was rebuilt not long ago and the block was decked. However, it's bone stock and why would anyone cut it .023" if it just needed to be cleaned up for a rebuild? Bores are beautiful and measuring within spec at 4.002"-4.004". I only measured one rod journal and it measures 2.309". So, the bores and rod journals appear original. So, a rebuild is questionable.

Were there any '94 351W engines built that had a zero deck clearance? I'm confused as hell right now and would appreciate any information that will help clear up this mystery.

Joe
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post #2 of 17 (permalink) Old 11-21-2018, 03:35 PM
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Re: Questions for 351W Experts

Do the pistons appear to be OEM? I ran through the numbers you put up and came up with the same .023 that you did. The F4TE is a roller lifter block, is your block? C9a and D0s were the only short deck blocks I'm aware of. I know that's no help, sorry, I just curious what you have going there.
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post #3 of 17 (permalink) Old 11-21-2018, 05:18 PM Thread Starter
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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.

Joe
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post #4 of 17 (permalink) Old 11-22-2018, 07:10 AM
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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!
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post #5 of 17 (permalink) Old 11-22-2018, 09:58 AM
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Re: Questions for 351W Experts

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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?

2012 CTS-V Coupe stock for now. 68 Falcon Futura. 408W Boss 351 block TKO 600 5spd currie 9" 3.70 ratio. Coilover suspension. 11.912 @118 MPH with only 1.8 60'
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post #6 of 17 (permalink) Old 11-22-2018, 04:32 PM Thread Starter
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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.

Joe
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post #7 of 17 (permalink) Old 11-23-2018, 06:13 AM
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Re: Questions for 351W Experts

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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.
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post #8 of 17 (permalink) Old 11-23-2018, 04:39 PM Thread Starter
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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.

Joe
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post #9 of 17 (permalink) Old 11-24-2018, 02:12 PM
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Re: Questions for 351W Experts

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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?

2012 CTS-V Coupe stock for now. 68 Falcon Futura. 408W Boss 351 block TKO 600 5spd currie 9" 3.70 ratio. Coilover suspension. 11.912 @118 MPH with only 1.8 60'
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post #10 of 17 (permalink) Old 11-27-2018, 05:42 AM Thread Starter
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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.

Joe
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post #11 of 17 (permalink) Old 11-28-2018, 12:32 PM
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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.
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post #12 of 17 (permalink) Old 11-29-2018, 07:00 AM Thread Starter
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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.

Joe
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post #13 of 17 (permalink) Old 11-29-2018, 07:02 AM
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Re: Questions for 351W Experts

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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.
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post #14 of 17 (permalink) Old 11-30-2018, 12:34 PM
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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
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post #15 of 17 (permalink) Old 11-30-2018, 02:45 PM
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Re: Questions for 351W Experts

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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
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