I actually took my stock heads, performer RPM intake, and a header gasket for Hooker super comp 428 headers to a head porting shop after I clay gapped piston clearance on heads. This elderly gentleman who had reworked FE heads when they were new did a remarkable job. He not only shaved both the intake and heads to mate but also port matched and polished them. On the exhaust side he not only ported and polished, but filled and re-drilled holes to mate the bigger 428 ports and different bolt pattern. He then topped it off with a multi angle valve job and the beast was awoken. I did have the intake and headers silver ceramic coated later by a coating company. The project turned out to be a total success with gobs more power.
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