Ls3,l92 piston whats the difference?

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Nov 30, 2011 | 07:36 PM

NOVACRAZY2007

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Ls3,l92 piston whats the difference?

What is the differance with a ls3, l92 piston? Will regular flat tops work with those heads? Are the valve pockets offset or something? Some manufactures have ls3,l92 specific pistons. Why?

Dec 10, 2011 | 04:43 AM

rsz288

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Quote:

Originally Posted by NOVACRAZY2007

What is the differance with a ls3, l92 piston? Will regular flat tops work with those heads? Are the valve pockets offset or something? Some manufactures have ls3,l92 specific pistons. Why?

L92's run VVT so the pistons have exhaust valve reliefs. LS3 are flat tops.

Dec 10, 2011 | 07:17 AM

SweetS10V8

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Quote:

Originally Posted by rsz288

L92's run VVT so the pistons have exhaust valve reliefs. LS3 are flat tops.

This is correct...

Quote:

Originally Posted by NOVACRAZY2007

Are the valve pockets offset or something? Some manufactures have ls3,l92 specific pistons. Why?

Becasue L92/LS3 heads use a 2.160" valve, which is much larger than the standard 2.000" valve in most cathedral port LS heads. They have to make the valve relief larger knowing its going to be used in conjunction with a very large valve.

Dec 10, 2011 | 09:35 PM

Oh4GTO

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Theres also two valve reliefs per piston which equate to -4cc.

Dec 10, 2011 | 09:59 PM

litle88

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Quote:

Originally Posted by Oh4GTO

Theres also two valve reliefs per piston which equate to -4cc.

Bingo!
Valve reliefs on both intake and exhaust

Dec 12, 2011 | 12:13 AM

Oh4GTO

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Actually its just for the intake. However they only manufacture one type so each piston has an extra intake valve relief on the opposite side.

Mar 14, 2014 | 11:46 AM

jgauspohl

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Sorry to revive an old thread but if I delete my vvt can I run the oem ls3 flat tops in my L92 with the L92 823 heads? Block and head surfaces are stock and using factory mls ls3 headgaskets. Greatly appreciate any help on this.