Help on head casting

TClovis · #1 Aug 7th, 06, 10:20 AM

My heads are 3931063. I have searched and all I can come up with is (oval port, closed chamber, 101 cc's)

Does anyone know the breakdown of the CC's for intake and exhaust. I'm asking for the purpose of the desktop dyno post. Thanks.

BlackoutSteve · #2 Aug 8th, 06, 12:44 AM

Those sorts of details were never published in the usual specs.. -I've never seen them anyway.

If they're off the engine, you'll just have to cc them yourself..

Busted Knuckles · #3 Aug 8th, 06, 04:39 AM

They're very similar to -290 and -215 castings. Port sizes should be very close to the same size as 781 and 049's as the 063, 215 and 290's were the earlier semi-closed chamber versions of the same head. I was told that all GM redesigned was the chamber, they were happy with port shape and sizes.

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