243 LS heads - fully assembled

[qwk_snd]

I have a set of 243 casting number LS style cylinder heads for sale. They are stock and unmolested, in perfect condition. The heads are fully assembled with stock valves and valve springs and they are ready to drop on a motor today.

I need $500.

Call or text me at 918-3four6-87zero6

[bootlife]

6.0 or 5.7 heads?

[AFSP1211]

They were aluminum 5.3 heads. What engine size they came off of doesn't matter. All that matters is the year they were made. Some early ones had probs with the casting process or some shiz. These should be good.

[qwk_snd]

They were aluminum 5.3 heads. What engine size they came off of doesn't matter. All that matters is the year they were made. Some early ones had probs with the casting process or some shiz. These should be good.

Yes yes yes. Thanks bud.

[bangbangskeetskeet]

They were aluminum 5.3 heads. What engine size they came off of doesn't matter. All that matters is the year they were made. Some early ones had probs with the casting process or some shiz. These should be good.

Not totally true...if they came off an 6.0 ls2 and are stock they would have the sodium filled valves so yes it does matter.

[qwk_snd]

Not totally true...if they came off an 6.0 ls2 and are stock they would have the sodium filled valves so yes it does matter.

He's talking about the casting, boss. But yes...

[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