408 vs 370 question
Thread Starter
Joined: Apr 2005
Posts: 361
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From: Huntington, WV
408 vs 370 question Its my understanding that if you take a lq based block and make a 402/8 that the piston skirt comes out of the sleeve at the bottom of the stroke, thus severely affecting the longevity of the engine. Is this true? If so how much can it affect the lifespan? Keeping the stock stroke and doing a 370 would eliminate this, correct? I do not want to spend the money if it wont last. Were talking abt a summer/good weather/weekend/occasional track use car btw..Thanks
Thread Starter
Joined: Apr 2005
Posts: 361
Likes: 0
From: Huntington, WV
Would you happen to know the length of piston that is correct?? Is that an issue that a vendor can help you make the right choice with when ordering (I hope!)?
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the LS7 in stock form uses a 4" stroke. so if GM would do it, then i dont see a reason why you shouldn't do it!
It's not that 4" or more is magically not reliable, it's the fact that it might be too much of a stroke on the stock sleeves of LS2s 3s 6s 1s etc.
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Verdad Gallardo You have the same issue with the LSX block. What everyone is telling you is with the corret rod length and piston design, there is no issue. If your builder is cared of the 4 inch stroke in the LS platform, leave him. He does not know the LS platform. There are thousand apond thousands of 4 inch LS engines running around making killer hp. I am one of them. They are reliable, very reliable if put tegether right. the 4 inch stroke is probably the most popular stroke when upgrading.
LS7s do have a longer sleeve. It is an issue but if it's properly setup (pistons designed for this) it seems to be ok. The gm LSX block has the same issue. I always wondered why they didn't make a slightly longer sleeve in the LSX.
