Round port exhausts flow 85% on my RAIV heads with the larger RAIV ports whereas the RAII have a smaller D port intake port that flows less so your exhaust is already outflowing your small D port intake and does not need the extra exhaust duration.
I'll bet the Engine Master's test did not test a motor with a head that has 80+% exhaust flow, much less 85%.
FWIW my RAIV motor ran better with a "reverse split" cam-4 cams in it no other changes and most of the RAIV round port exhaust stocker and Super Stockers use a single pattern cam.
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Skip Fix
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 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
Last edited by Skip Fix; 10-10-2023 at 05:50 PM.
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