243 LS heads - fully assembled

[bootlife]

6.0, 5.3, 5.7 have diff combustion chamber sizes. If u put 6.0 heads on a 5.3 u will loose compression

[ecld_07]

If u put 6.0 heads on a 5.3 u will loose compression

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

[MrHorsepowerLSx]

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

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

[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

[George C]

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

you seriously cant be serious with that math

[o2camaross]

you seriously cant be serious with that math

Come on George. Twas a joke my friend

[qwk_snd]

Come on George. Twas a joke my friend

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

[ecld_07]

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

Was a joke... Lol

[bootlife]

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

Thanks!!!! Least somebody knows wats going on

[kerrige]

Thanks!!!! Least somebody knows wats going on

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.