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0512htp Afr 18 Z

...The 66cc size is slightly smaller than the stock LS1 (one cc) and should raise compression to about 10.4:1, slightly below a stock LS6. For best results on a naturally aspirated motor, Tony recommends using a thinner head gasket (for better "quench") and milling the heads slightly for a higher compression ratio.
1999 Chevy Corvette - AFR 205CC Heads - Cobra Killers

 ...The 66cc size is slightly smaller than the stock LS1 (one cc) and should raise compression to about 10.4:1, slightly below a stock LS6. For best results on a naturally aspirated motor, Tony recommends using a thinner head gasket (for better "quench") and milling the heads slightly for a higher compression ratio.  View Related Article

 

 

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