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Old 10-12-2002, 08:31 AM
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Question destroke info???

can any one of you guys help me hear i have a sbc 350 and i want to destroke it with smaller crank but i dont know what crank or stuff to use with it <img src="graemlins/sweat.gif" border="0" alt="[sweat]" /> so any one can help me with any combo or info on how to do that? thank you thank you thank you for the help :p

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Old 10-12-2002, 10:11 AM
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the only way i know of destroking a 350 would be using a large journal 327 crank and pistons..but all your going to do is make a 327...you could put your 350 crank into a 400 block to make a 377
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Old 10-12-2002, 01:14 PM
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I know for sure you can get about any stroke crank from callies and other high end manufacturors, but the will cost you about $1500. I would suggest that you watch ebay, as there are alot of 3.35 stroke sbc cranks that go through there. I think they are from circle track and nascar engines running 4.125 bore to get a high winding 350 cid range motor. Just remember you also have to have a set of rods that are 1/2 the length of the stroke differance longer to maintain the correct piston hiegth in the bore. Or you can get custom pistons also and just run whatever rod you want. Prolly about $650+ for a set of weisco or je.

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Old 10-13-2002, 06:39 PM
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You could go all the way to a large journal 283 crankshaft, which will make a 302. The same engine was factory produced in the 67-68 camaro's. Good Luck...
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Old 10-13-2002, 06:53 PM
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there is no large journal 283 crank, only small journal. a non-production 302 is a 283 crank in a pre 1968 327 block.

you could put your 350 crank into a 400 block for 377 cu. in. or find a large journal 327 crank and put into a 400 block for 348 cu. in. either one would be a screamer. 400's have larger main journals, so main bearing spacers would be required. they are around 75 bucks.
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Old 10-13-2002, 10:29 PM
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The only possible reason to destroke an engine is to gain top end rpm or fit it into a race class, what are your intentions? You plan to turn that sucker 9000 rpm?
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Old 10-14-2002, 06:33 AM
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well i was thinkin to take it over 9000 rpm but now that some of you talked about a 400 block and a 327 crank it turnd my head and i wondered if it can hit the 11000 or 12000 rpm range but i know ill lose the low rpm like most of the time ill be in 3000 or 4000 rpm on the streets.and one more thing wich one iz batter and give more power destroking or stroking? and can i use turbochargers with these caind of engines cuz i have a tow turbos frome a toyota supra 7mg and each one gives more then 35 psi so i dont realy know what to do use the turbos or a supercharger or just buy a crate engine or kill my self and do nothing.and the class i wanted to race in was street racing.and thanks for you help guyz you realy are nice ppl i wish you all de best with any thing you do. .....blue ray.....
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Old 10-14-2002, 09:03 AM
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Unless you plan on spending some big dollars on this engine I would just forget it, if were just talking that's one thing but we are discussing very hypothetical things here. Unless you can make your own forged rods out of titanium then this is not a realistic goal.

Even when Chevy went F1 racing years ago they had problems turning a destroked SBC to over 10 000 rpm, what makes you think you can do it when Chevy couldn't?
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Old 10-14-2002, 09:06 AM
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I don't think you are going to be able to build a small block capable of 11,000 to 12,000 rpm that is even close to being streetable. That is Formula One rpm range and those cars have stroke of about 2.500" or less and they do not use pushrods! We used to run some 302" Chev drag race engines in the 9000 to 9500 rpm range with roller cams and Hilborn injection.
You can destroke your engine by offset grinding and going to very small rod journals, such as 1.88" Honda size like the NASCAR guys are doing. But as Jaw stated, there really isn't much use going to all of this effort and expense unless you are building an engine for a particular class.
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