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will 243 heads fit on a 99 ls1

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Old Jul 23, 2008 | 02:35 PM
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From: pleasant hill
Default will 243 heads fit on a 99 ls1

im looking into 243 heads for my ls1 and im not sure if they will fit and or what ill have to do to about the bolts?
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Old Jul 23, 2008 | 02:59 PM
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yes, yes, yes. 243's will fit on, you will have to replace the bolts with oem ls1 bolts, or arp head studs if needed.
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Old Jul 23, 2008 | 03:58 PM
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yes it is the same **** as the LS6 the 243's work but everytime heads are removed the bolts on the motor must be replaced!
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Old Jul 23, 2008 | 11:24 PM
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will it raise the compression ratio on the motor from stock?
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Old Jul 24, 2008 | 02:43 AM
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it will raise a bit.
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