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Old 07-31-2005, 11:58 PM
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I have 427 BBC:

1.7 Ratio Roller Rockers, Comp Cams Double Valve Spring, .530 Lift Cam, Bored 0.60 and Stroked, Flat Top JE Pistons, Eagle Connection Rods, Scat Crank, Heddman Headers Holley Double Pumper Carb on Stock Manifold. Have stock heads on.
Looking up the Heads It lists open chamber. Is there a CC number I am safe to assume is might have. What kind of Manifold Can I build More Power with? Head Casting number is 330864. What kind of Head if should i run if I decide to go Aftermarket.


Last edited by LowVintage49; 08-01-2005 at 12:23 AM.
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Old 08-01-2005, 12:01 AM
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first how can you say you have 9.7 comp ration if you dont know the cc of the heads, and for the intake ..try a edelbroke rpm ..
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Old 08-01-2005, 12:43 AM
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Open chamber heads are large cc heads appx 112 cc up to 122 cc. Closed chamber heads are low cc heads 97cc to 109. Edelbrock heads are a semi-closed head and are 110 cc.

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Old 08-01-2005, 03:14 PM
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I would agree on the performer RPM or RPM air gap. As far as the heads if you go aftermarket, for the money, with the size of the motor you have, I would just get a set of 049's or 781's ported and polished with the 2.19 1.88 valves. I just had that done to a set of 049's and they ended up flowing 325 cfm. I am not sure what the final runner size is, but they started as 252cc. With the size of cam you are running, I would try to keep the runner size relatively small, definitely stick to a oval port head.

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