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Old 02-17-2006, 07:08 PM
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348?

Looking to run a 351w in a 350 class. Need to destroke. any sites or charts available for this? I heard of 348 destroke. Need info, thanks

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Old 02-17-2006, 07:31 PM
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The GM 348 (also known as the wedge head) is not the 350 ci small block motor. SBC
The more well known version of the wedge is the 409. As in "She's real fine my 409" bla,bla,bla.
BTW, what is a 351w? Never heard of it.

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Old 02-17-2006, 07:48 PM
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Quote:
Originally Posted by vicrod
The GM 348 (also known as the wedge head) is not the 350 ci small block motor. SBC
The more well known version of the wedge is the 409. As in "She's real fine my 409" bla,bla,bla.
BTW, what is a 351w? Never heard of it.

vicrod
351w is a Ford............I have heard of 302s made into 347s.
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Old 02-17-2006, 09:03 PM
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351w destroke

To destroke a 351W to a 348 would require ofset grinding the crank only .010", which would allow you to run stock .020- .030" undersized bearings. The reason you would have to run 20-30 under bearings is once the cut is made, the journal would have to be refinished. This will also lower your compression ratio with current pistons by about half a ratio, however, a Winsor block can safely be decked .030" and that will regain your lost compression. The 69-70, 351W had a deck height of 9.48"; the later ones have a deck height of 9.503". The .010" offset grind would be to decrease the stroke .020" to make a 3.48" stroke. I am wondering what rules require you to destroke your 351W?
If I were going to run in such a class, I would put a 347 stroker kit in a 302 and get rid of 65 lbs of engine weight in the process, or would the rules allow that?
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Old 02-18-2006, 12:45 PM
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Quote:
Originally Posted by Max Keith
To destroke a 351W to a 348 would require ofset grinding the crank only .010", which would allow you to run stock .020- .030" undersized bearings. The reason you would have to run 20-30 under bearings is once the cut is made, the journal would have to be refinished. This will also lower your compression ratio with current pistons by about half a ratio, however, a Winsor block can safely be decked .030" and that will regain your lost compression. The 69-70, 351W had a deck height of 9.48"; the later ones have a deck height of 9.503". The .010" offset grind would be to decrease the stroke .020" to make a 3.48" stroke. I am wondering what rules require you to destroke your 351W?
If I were going to run in such a class, I would put a 347 stroker kit in a 302 and get rid of 65 lbs of engine weight in the process, or would the rules allow that?

Ya Buddy, those Chebbies can't give up 2 cubes to a Ford.... then they would really have a reason to whine when you beat them.....

Max is right-on. Thanks Max.
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Old 02-18-2006, 07:24 PM
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348?

My bad, I goofed on what I said about destroking the crank. You would have to offset grind it .020" to get the 3.46" stroke needed to displace 348 CID.
The final grinding would require running 30 under bearings, as there would have to be a .010" cleanup grind after the offset grinding.
My apologies, I was very tired when I was writing my previous epistle on this.

Thank you xntrk
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Old 02-18-2006, 07:38 PM
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Now wait MAX...... YOU WERE RIGHT THE FIRST TIME...

Chebbie and Ford are the same bore...... 4.00.. So if you cut the Ford to the Chebbie stroke.. 3.48..... that would make them the same... If they both bored +.030 they would still be the same, but both would be over 350..

I think the rules are irrational for not allowing the extra .020 stroke for the Ford. Sounds like a nit-pik to deter Ford guys from running in the class since they have to spend more bucks to modify their crank.

Last edited by xntrik; 02-18-2006 at 07:43 PM.
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Old 02-18-2006, 07:51 PM
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348?

Yeah really, especially since we all KNOW that the 351W is such a boat anchor engine and cant get out of its own way. It never ceased to amaze me how racing rules always seem to favor a particular brand of engine (wears a Bow Tie), and when you go to tech inspecion, the inspector doesnt have a clue what hes looking at with a Ford engine.
Better to stand out in the crowd as an individual than to be a clone.
I may well have misread the origional post on this thread, as I took it to mean he was required to run a 348 Cubic inch engine, rather than a 3.48 stroke.
Oh well. If its a 348 cuber, use the later plan, if its a 3.48 stroke, take the former.

Last edited by Max Keith; 02-18-2006 at 07:57 PM.
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