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Old 12-14-2007, 03:01 PM   #1
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351W Build Suggestions - for a Truck Motor

Seen several 351W builds, but nothing for a truck.

Anyone have a build up with dyno results for a truck 351W? I want something that'll move a 5500 lb Bronco without having to rev the snot out of the engine.

Highway cruising RPM right now is 3300, but I have no idea if my converter is good or not nor do I know the stall. The trans is a C6 (staying, but I'll rebuild it, no clue on the converter). The rear is an 8.8 with 3.55s. Front is a Dana44 with 3.54s.

Any time I've over 40 mph I'm at 3000 RPM, but between 35 and 40 I'm in the 1800-3000 range. Sounds freaky good right now at 1800.

400 ft-lbs or more between 1800 rpm to 4500 rpm. With a carb. Doable? Budget?
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Old 12-14-2007, 03:20 PM   #2
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Do a stroked 351 based engine.

393, 408, 418, yada yada.....all will get you what you want.

with the 393, you could use the stock rods and some 302 pistons to save on cost.
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Old 12-14-2007, 06:41 PM   #3
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What is the crank that's used in a 393?

I was hoping for something "economical," i.e., less than $3500 including machine work, parts, and gaskets. Seeing as how the top end rebuild kit from Comp Cams is $1100, and machine work is $1500, and a gasket kit is $250, that doesn't leave a lot of cash.
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Old 12-15-2007, 10:17 AM   #4
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Wink

The 393 uses a 3.85" crank.

They can be had pretty cheap, as most guys are building 400+inchers.

Should be able to get one for $200ish.


You could just talk to Jay Allen at camshaftinnovations.....he does wonders ....ask the mud bogger/tractor pull clients of his. You could just do a 351w. if you have a good crank already.
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Old 12-15-2007, 09:33 PM   #5
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Maybe I should be asking this -

What kind of torque curve what would a good stock rebuild generate for a 351W with the stock block, rods, D94E (69cc) or E7TE (62? cc) heads, new pistons that put the compression up in the 9-9.5:1 range (still good for 87 octane), a thumpy cam, long tubes, dual exhaust.

Stock it did 278 ft-lbs @ 1400 RPM and 139 hp @ 3200 RPM with the 2bbl carb, 8.8:1 CR, and a corked up exhaust.

I would hope that with E7 heads, 4bbl carb and intake, good exhaust, and a cam to work with this you could pick up 50+ ft-lbs... that would put me close to 350 ft lbs off idle, and I should be good.

See I'm not keen on modifying the truck a whole lot... seeing as how I have a 460 that I could use but I'd rather keep the truck close to stock.
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Old 12-16-2007, 09:15 PM   #6
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Well I found a few obscure posts by people here and in other places that had 351W builds that put out some decent power.

351W block, stock displacement
650 cfm 4bbl carb
4 bbl intake that flows 15-25% more than stock
E7TE, GT40, GT40P heads

Seen typical 350-400 ft-lbs, 250-300 hp.

My Bronco runs between 1500-4000 RPM. I've never run it over 4500-5000 as far as I can remember, so it looks like a stock rebuild with P heads should be all I really need.
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Old 12-17-2007, 09:53 AM   #7
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the KEY is the cam, and the induction.

This is why I suggest contacting Jay Allen and getting a custom cam.....THAT IS THE SINGLE BIGGEST AND BEST BANG FOR YOUR BUCK.

If it were me:

I'd look for a 393 crank......try Speedomotive they should have them for under $200.00.
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Old 12-17-2007, 06:42 PM   #8
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P heads might be a problem, as far as I know there are no truck application headers that work with them. If you do find a set, let me know because my friend wants some more power out of his E7 head 351 EFI motor, and a set of those would help greatly.

Stock E7 heads pretty much suck on a 351. My friend's EFI truck has not much more power than a 302 with the same heads. Ported, or ported GT40 heads would probably do just fine though. In stock form you can really tell its not breathing worth a crap tho.

Is this a flat tappet motor or a roller motor? If its a roller motor, I'd do something mild like the Exploder cam, or one of those Comp XE264 cams. Flattie would work great with an RV cam, though I don't know any specific cam grinds to suggest. Something without a huge amount of duration with a nice low rpm power band is ideal, if it says 1500-4500 rpm or something, it will do well. They don't do so well up top but if you never wind it over 5 grand you'll be just fine with one.
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Old 12-17-2007, 08:35 PM   #9
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Wink

It is all in your budget.

You could get a nice set of slightly used edelbrock performer rpm heads, TFS heads, better yet...new Canfield 195 heads. AFR 185 would work very nice as well...but are way more money.

If heads are out of the question...then really, you NEED to get in touch with someone who can make the best use of what you have....Jay Allen or Buddy Rawls come to mind.

Personally, if you stick with 351w....edelbrock heads or tfs heads will be very nice...iof you go stroker..393...canfields will do you well...and they are 1195 with the good stuff in them from Jay.
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Old 12-18-2007, 09:52 AM   #10
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You may want to model your motor after the International Harvester V-8's, the low CR gas 348" and 392" motors that powered dump trucks and school buses, as well as their Scouts and Travelalls.

Small, high-velocity ports in low CR heads. The cam specs are really wild, for us used to drag-race inspired durations.

Going off of memory, the cams 0.050 specs are about 193 intake and only 185 or so on the exhaust. I don't remember the LSA, but believe it is rather narrow. These cams are DONE by 4000, but build alot of cylinder pressure down low, and ALOT of lowend torque.

FYI, the IH motors also came with forged crank & rods, and shaft rockers!
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Old 12-18-2007, 01:17 PM   #11
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Budget 393W with stock 351 rods, cast 3.85 crank (check Ebay for them for less than $200), stock or aftermarket hyper 302 pistons. A set of out of the box alluminum heads, almost any aftermarket alluminum 302 sized head (nothing big) that you can find used will get you 300-350 rwhp and gobs of low end tq, Airgap or Performer type intake and a 650 carb. Custom cam from Buddy Rawls.
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Old 12-18-2007, 07:17 PM   #12
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These $200 cranks... are they made in CHINA?

I'm going to keep my American engine American (hence the beauty of real Ford parts that I have now), and I'm real leery of a $200 crank being a quality built unit from America.
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Old 12-18-2007, 07:22 PM   #13
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Another idea for a head would be a Windsor Sr. Larger combustion chamber would help compression down in a stroker application. I had a full size Bronco so I know what they are like at the gas pump.
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