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11-14-2010, 10:52 PM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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Not Ranked
302 or 351 W ?
I'm in the collecting mode for engine parts. I have the choice for a 302 or 351w. I believe the 351 is an EFI model out of a Bronco. Trying to decide between the 2. What I'm looking for as an end result is a 350-400 hp driveable engine. Any pros or cons to the 351?
John
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11-15-2010, 02:46 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Unless you're trying to make a period correct looking car (302 is same size as a 289), go for the cubes.
It's a lot easier to make horsepower with a larger engine and you get more torque as a by product. A 400hp 302 isn't unheard of, but it takes some nice parts to get it up there. A 400hp 351W is a lot easier to achieve, plus you have lots of growing room (stroke it to way up over 400 cubic inches) in the future.
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11-15-2010, 08:04 AM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
The Windsor has over an inch of extra deck height. Why build a small block (8.20) when you can have a medium block (9.48)?
Bob
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11-15-2010, 08:08 AM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
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Quote:
Originally Posted by Bob In Ct
The Windsor has over an inch of extra deck height. Why build a small block (8.20) when you can have a medium block (9.48)?
Bob
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That was my question!! I'm familiar with the 260-302 engines, not so much with the 351. I'm curious as to parts interchange and availability with the 351.
John |
11-15-2010, 08:47 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Parts availability for the Windsor is basically endless...but so is availability for the 302.
As far as interchange, a 351W can share almost everything with the other small blocks (non-Cleveland), with exception of the intake, oil pan, distributor, crank, rods, pistons, and a few other odds and ends. |
11-15-2010, 11:19 AM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
Posts: 3,077
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To answer your question, 351 351 351 351 351 351 , there is no replacement for displacement.
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11-15-2010, 12:08 PM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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Just bought the 351. It's an EFI with a blown head gasket. i told him I didn't want the EFI so i got it for $100.00 and he's going to pull it.
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11-15-2010, 12:30 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Brent: I am somewhat a fan of the 351 however I prefer to have the racing version with a steel crank and smaller main journals. There is something about the OEM main size that detracts from the overall package.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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11-15-2010, 01:04 PM
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CC Member
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Join Date: Jun 2005
Cobra Make, Engine:
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350hp to 400hp, he can just use heavy grease for the mains.
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11-15-2010, 01:56 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Quote:
Originally Posted by Rick Parker
Brent: I am somewhat a fan of the 351 however I prefer to have the racing version with a steel crank and smaller main journals. There is something about the OEM main size that detracts from the overall package.
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Rick, for 7000+ rpm engines, I would agree that the Cleveland mains would be a better choice. But there are thousands of big inch 3" main Windsor engines running around.  |
11-15-2010, 02:15 PM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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What are the mains on a 302 and on a cleveland???
.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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11-15-2010, 03:39 PM
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CC Member
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Join Date: May 2008
Location: Sacramento,Ca.,
Ca.
Cobra Make, Engine: Midstates (2001)
Posts: 1,724
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289/302 is 2.249
351c-4v,cj,Boss,HO is 2.749
351w is 3.00
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11-15-2010, 05:59 PM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
I will chime in that, in my opinion, the 351W would make a more suitable engine for the Cobra build. First, it is easier to attain the 400 BHP mark with the 351W and with more torque at lower RPM. For all practical purposes, only the cylinder heads water pump and timing cover are interchangable with the 289/302. Performance parts for the 351W are readily available and not more expensive. Next is the fact that the 351W is much closer to the dimensions of the original 427FE than the 289/302 and, again in my opinion, fills the engine compartment better and looks better nestled in there. Third, if you decide to make your 351W appear more true to original Cobra, there are parts available to make the transformation look believable. The dual quad intake from Price Motorsports is a beautiful piece and accepts Holley carbs and original style 427FE linkage. An original 427FE fuel canister and bracket is easily adapted to the 351W (even the original lower hard fuel line fits perfectly) and, of course, my valve cover adapter plates which allow the use of 427FE pentroof valve covers on the 351W (as well as the 289/302).
__________________
Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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11-15-2010, 06:30 PM
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Why do smaller mains help at higher rpm's, it would seam a larger bearing would be better, once again somebody please explain.
Thanks
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11-15-2010, 07:06 PM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
Smaller main bearing diameter is more desirable at high RPMs. If you recall your geometry, the surface velocity of an arc increases as the radius of the arc increases at a given RPM. In other words, if you have a crank turning at 7000 RPMs, the surface of the crank journal against the bearing is traveling at a measurable rate of speed against the bearing surface. As the diameter of the journal increases, so does the actual velocity of the surface of the journal against the bearing translating into more heat and friction produced. Therefore, racing engines like to keep the diameter of the main journals as small as possible without creating a weakness in the crank.
__________________
Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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11-15-2010, 07:25 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Yea I konw....
[IMG] 
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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11-15-2010, 07:32 PM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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Why are there 8 sleeves?
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11-15-2010, 07:41 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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And a 180 crank?
__________________
Chas.
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11-15-2010, 08:33 PM
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CC Member
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Join Date: May 2008
Location: Sacramento,Ca.,
Ca.
Cobra Make, Engine: Midstates (2001)
Posts: 1,724
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i would build a 351w....you can get 400 HP from it without breaking the bank or your wallet....its more than enough HP to go out and get into trouble with and it will live a long time without haveing to spend your weeknights working on it to keep it running.. and if you want the looks of an FE use an FE...it dosent matter what intake you use or what valve cover adapters you use IT STILL ISNT AN FE....
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11-15-2010, 08:34 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
the 3" main "see" 20% more fiction than the 2.75" main.
the 3" main is better for low rpm torque motors used in trucks and large passenger cars.
Dwight
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''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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