can i destroke a 351 w with a 302 or stroke a 302 with a 351w? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-02-2006, 08:11 AM
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can i destroke a 351 w with a 302 or stroke a 302 with a 351w?

hello all i was just wandering if i could pick some ones brain ive got a 351 police interceptor & a 302 engine that i would like to either stroke or destroke i was wandering if i took a 302 crank & put it in my 351 engine if it would destroke it to a 347 or if i could take the rods from the 351 & put 'em in a 302 or the crank from the 351 would that stroke the 302 to a 347 all inquires welcome thank you sincerily jim's 84gt350

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Old 04-02-2006, 08:25 AM
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302 shaft in a 351 would be a tall deck 302. a 351 shaft in a 302 would be a low deck 351, and ford didn`t make either one of`em. both blocks have a 4 inch bore, a 351 has a 3.5 inch stroke, the 302 has a 3 inch stroke.
My question is, why destroke? less cubic inches for more money?
if you have a 351 stick with it.
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Old 04-02-2006, 09:24 AM
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Actually deck height isn't the real problem, a set of different length rods or pin height would remedy that. The BIG issue is the main bearing sizes. In order to de-stroke the 351, you'd need a custom ground crank ($$$$) and a 351 crank couldn't be ground enough(without ruining it) ro fit a 289/302 main saddle. There are several 347 stroker kits available for the 302, but the deck height of the 302 causes some pin in oil ring issues that makes a very big 302 nor feasible for a street engine. The de-stroked 351 is an interesting possibility because you could really juggle the L/R ratio and probably generate some good 3's, however the down size is the main bearing size, so large for strength they also create more friction. That's why you see so many large inch 351s and 302s. I think off the top of my head that the 351W has the same main sizes as a 460, which gives a lot of load bearing, but can generate a lot of friction in a small high revving 302 that was made from de-stroking one.
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Old 04-02-2006, 09:50 AM
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I don't know what would be gained by destroking. The 351W is heavier than the 302. The trick used to be to use a 351C crank (special main spacers available) to retain the stroke and increase bearing speed.

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Old 04-02-2006, 12:21 PM
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considering the price, it would be cheaper to build a 393 inch windsor, 6000 rpm shifts are normal... that way instead of using the 302 crank, you use the 302 pistons...lol yet retain the stock length 351W rods..

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Old 04-02-2006, 01:04 PM
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Directly swapping hard parts of a 302 and a W is not possible, except for the inadequate heads.

Duke, I believe you misstated. A smaller journal crank would reduce bearing speed.

Bearing speed is irrelavent in the real world. Reduced speed is maybe good for 3 horsepower. A good set of heads could be worth 100.

Last edited by xntrik; 04-02-2006 at 01:11 PM.
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