I'll bet if you dynoed it peak HP would be 5500-5800.There have been some posts on air flow on different manifolds. The Performer is going to drop the % of the head flow signifigantly more than the RPM on a high flowing E head.Probably down to 90% of the head flow as the cfm increases at higher lifts. Kind of like the Circle Track classes that have to run a 390 cfm carb or a restrictor plate to limit the airflow in.Torker II or an RPM have alot less loss %.
A stock or mildly ported iron head yes the difference is not as great. Jim Hand I believe has been running a RPM since he started runing ported iron heads.
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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
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