243 LS heads - fully assembled

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Originally Posted by ecld_07

Are you sure. Surely a larger cumbustion chamber wouldn't drop compression..... Bump for a good seller and thread crappers

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Larger combustion chambers will lower compression if the heads they are replacing had smaller chambers, example an 06 lq9 and an 06 ls2 use the same pistons, the lq9 uses a 71cc chamber and the ls2 uses a 64.5cc ( even tho GM displays it at 64cc ) the lq9 registers a Compression Ratio of 10.1:1, the ls2 with its smaller combustion chamber with the SAME piston it will yield an 11:1 compression ratio. This example was given based off of identical bore x stroke combos based off of a 4" inch bore using identical pistons..... Hope this helps bump :)

But guys, true 6.0 243's on a "cupped" piston 5.3 would be approximately 12.687 CR, but if they came off a 5.7 and were put on a 4.8 with "domes" it would have 7.569 CR. Bump for a stinky okie. Btw, I wish I could afford them lol, but Im broke as always

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Originally Posted by o2camaross

But guys, true 6.0 243's on a "cupped" piston 5.3 would be approximately 12.687 CR, but if they came off a 5.7 and were put on a 4.8 with "domes" it would have 7.569 CR. Bump for a stinky okie. Btw, I wish I could afford them lol, but Im broke as always

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you seriously cant be serious with that math

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Originally Posted by MrHorsepowerLSx

Larger combustion chambers will lower compression if the heads they are replacing had smaller chambers, example an 06 lq9 and an 06 ls2 use the same pistons, the lq9 uses a 71cc chamber and the ls2 uses a 64.5cc ( even tho GM displays it at 64cc ) the lq9 registers a Compression Ratio of 10.1:1, the ls2 with its smaller combustion chamber with the SAME piston it will yield an 11:1 compression ratio. This example was given based off of identical bore x stroke combos based off of a 4" inch bore using identical pistons..... Hope this helps bump :)

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Was a joke... Lol

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Originally Posted by George C

you seriously cant be serious with that math

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Come on George. Twas a joke my friend

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Originally Posted by o2camaross

Come on George. Twas a joke my friend

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lol @ you guys... SOMEONE BUY THESE THINGS! $400 plus shipping!

SOLD! Close thread...

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Originally Posted by MrHorsepowerLSx

Larger combustion chambers will lower compression if the heads they are replacing had smaller chambers, example an 06 lq9 and an 06 ls2 use the same pistons, the lq9 uses a 71cc chamber and the ls2 uses a 64.5cc ( even tho GM displays it at 64cc ) the lq9 registers a Compression Ratio of 10.1:1, the ls2 with its smaller combustion chamber with the SAME piston it will yield an 11:1 compression ratio. This example was given based off of identical bore x stroke combos based off of a 4" inch bore using identical pistons..... Hope this helps bump :)

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Thanks!!!! Least somebody knows wats going on

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Originally Posted by bootlife

Thanks!!!! Least somebody knows wats going on

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I think you are trying to argue something completely different. All stock 243s are the same no matter what motor they come from minus the valve thing. Different motors will net different cr according to a lot of factors that have little to do with the heads and everything to do with pistons, stroke, etc. Not all 5.3s are created equally, but all 243s basically are.

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Originally Posted by bootlife

Thanks!!!! Least somebody knows wats going on

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Let me go ahead and reiterate something I've said about you multiple times... you're literally the dumbest guy on this forum at this point. Please, do us all a favor and don't speak.