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241 vs. 243 heads - differences??

Old May 16, 2007 | 01:37 PM
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Default 241 vs. 243 heads - differences??

I've heard reference to both 241 and 243 heads - my stock 2001 heads that I just removed were 241 heads

What is the difference b/w 241 and 243 heads? Which are better / more desireable? Or, is it simply a matter of what head was put on what year of car?
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Old May 16, 2007 | 01:40 PM
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243 is the Z06 casting, 241 is the last and best LS1 casting. The 243 has D-shaped exhaust ports and some other minor differences.
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Old May 16, 2007 | 01:48 PM
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Thanks Brian - so then, are 241's better than 243's, or is it a toss up?
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Old May 16, 2007 | 02:00 PM
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No 243 heads are better.

Z06 head > all LS1 heads

241 LS1 head > all other LS1 heads
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Old May 16, 2007 | 02:16 PM
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Factory yeah but you can get heads ported to outflow LS6 heads. I just got a set of... hell I don't know the casting number but they're PRC stage 2.5 5.3 liter heads from TSP and they have some pretty awesome flow numbers.
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Old May 16, 2007 | 02:34 PM
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Originally Posted by Cobra4B
No 243 heads are better.

Z06 head > all LS1 heads

241 LS1 head > all other LS1 heads
Ah, Ha! Them's terms I understand! Thank you - I was just trying to figure out how "sought after" or not my factory heads might be -

Still waiting for a dyno appt - I'll post #'s after that - can't wait!
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