Hello, Ok got some major issues Just had a 2003 GT 4.6 2 valve with P.I. heads rebuilt .010 over so now its a 284 C.I. Machine shop fitted JE flat tops and we now have a comp ratio of 12:1 Think they were thinking of non PI heads which would have netted me a 10.5:1 C/R Motor has comp cams 102100 cams, Typhonn intake manifold Accufab Plenum and throttle body BBK equal length headers C/A intake Engine tuner cannot tune it with 91 octane fuel. Without overheating or piston knock( car has a 3 core radiator high flow pump fans coming on @ 180 with a 180- T stat ) and still runs hot ( 240+ degrees) I see the only option is to increase the head gaskets to .080 which would net us a 10.7:1 comp ratio Thought of putting on some Trick flow 44CC heads but still wouldn't net us the compression ratio below 11:1 Everyone says not to run octane booster for a continuous time talked to VP they said not to or couldn't run water w ethanol injection . Dont really want to go with E85 due to the [problems with fuel lines or if it sits for weeks n weeks. Only 2 options pull the entire motor out and have it re done and fit 7 C.C. JE pistons in it or do the gaskets, any other options you guys may have would be great! Feeling like i got F'd!!