5.3 l33 vs 5.7 ls6

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Nov 17, 2009 | 12:03 AM

#11

SincalT/A

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From: Currently In suspense.

If you are going to dual spring valve springs I would stay away as the valves are two piece.Under higher spring pressures they have been known to fail.

Nov 17, 2009 | 12:18 AM

#12

ForcedTQ

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From: Northern CA

Quote:

Originally Posted by fastgmc53

might be right but the LS1 blocks cannot be bored but maybe .010... they have to have new sleeves pressed in. If the sleeve is the same original thickness as LS1's then it could be bored to the 3.898'ish.... I would like to know for sure as that could be a neat build!!

Stock LS1 bore is 3.898", so they should definitely be able to handle that. Most overbore LS1's can go to 3.905" Sonic Test the bores!

Nov 17, 2009 | 01:20 AM

#13

1Bear

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From: Jones Creek, Texas

Quote:

Originally Posted by ForcedTQ

Actually Fastgmc, from what I've heard the cylinder liners in the L33 block are the same as what is in the LS1/LS6 blocks as far as bore goes. It would be worth it for the O.P. to take the block down to his machine shop of choice to have the block liners sonic checked so that he knows the maximum safe bore.

I agree, if the block checks out it could be possible to go out to a 3.910" max bore, the same as what is possible with a good '99 and later LS1/LS6 block. The '97 & '98 LS1 blocks typically have a 3.905" max bore.