Head decision...
#22
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You could go with the tfs 205s, they make about 11.5:1 compression have better ptv that stock heads, and flow great. Only downfall is you have to buy rockers for them to work.
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Why do you need the AI HCR's? It is my understanding that they are only beneficial when you can not achieve a high enough CR with milling and a thinner head gasket due to PTV clearances. Maybe that is the case with the CR you are looking for, and the cam you are running.
#27
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I have seen a lot of positive results from AI here in the dyno section, and will almost certainly go to them for head porting if/when I get a head & cam combo.
Why do you need the AI HCR's? It is my understanding that they are only beneficial when you can not achieve a high enough CR with milling and a thinner head gasket due to PTV clearances. Maybe that is the case with the CR you are looking for, and the cam you are running.