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Generation III Internal Engine 1997-2006 LS1 | LS6
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adding 243 heads

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Old 03-22-2010, 04:46 PM
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i'm replacing the heads on my 99 ls1 with ls2 heads. do i use 6.0 or 5.7 head gaskets?
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Old 03-22-2010, 04:53 PM
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5.7 gaskets
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Old 03-29-2010, 08:58 AM
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thank you.
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Old 03-29-2010, 11:43 AM
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your welcome
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Old 03-30-2010, 01:18 PM
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Yeah 5.7l gasket!!
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Old 04-02-2010, 06:52 AM
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if u did change the heads to 243, how much HP gain u will get on ls1 motor??
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Old 04-02-2010, 08:20 AM
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~15Hp
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Old 04-02-2010, 11:52 AM
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Stock for stock yeah. If you're going to go through the trouble of a head swap I guess I would get them milled a bit. Not too spendy and good gains.
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