Steve the typical 3/4" Qjet/4150 adapter, granted I smoothed the casting flashing and opened it up the manifolds 4 holes(so not even modified to 2 holes like Cliff's).
The biggest thing I will saw with RAIV heads after running 4 different cams and 2 sets of headers, you can see on Jay's flow numbers- the E/I ratio is pretty high so it needs to be cammed to match, and can be prone to reversion if the exhaust system does not scavenge well. When I had the RAIVs on a 400(changed the class rules so no longer legal on a 455) I picked up using smaller 1 3/4 headers and a "reverse split" cam 242/236 @ 0.050. John Angeles on the SS RAIV car runs a single pattern cam for the same reason.
And mine with gasket match and pocket clean up were around 253cfm @28 on intake-corrected from 10" and a calibration plate calibration that day on the smaller SF -110 bench. Tom my buddy with the small bench bought 4 calibration plates like the "pass around plates" and has tweaked his bench to match them. 85% E/I ratio!
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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
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