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76HighSierra · 11-06-2004, 03:22 AM

Does anyone have an absolute positive spec for the factory combustion chamber volume on unmodified "781" casting heads off of a 454 BBC? Some books say 109cc, some say 110cc, while others say 119cc. I know the only "true" way is with a burette and a cylinder head cc'ing kit, but I'm just looking to know if anyone has noticed all these varying figures and has an absolute answer. Again, my heads have never been planed or had the chamber modified......in fact, they've never even been off the engine!

Anywho, thanks in advance, folks.

11-06-2004, 03:22 AM	#1
76HighSierra DAMN, I love Big Blocks! Join Date: Aug 2003 Location: New Mexico, USA Posts: 619	BBC "781" Cylinder Head Chamber Volume. Does anyone have an absolute positive spec for the factory combustion chamber volume on unmodified "781" casting heads off of a 454 BBC? Some books say 109cc, some say 110cc, while others say 119cc. I know the only "true" way is with a burette and a cylinder head cc'ing kit, but I'm just looking to know if anyone has noticed all these varying figures and has an absolute answer. Again, my heads have never been planed or had the chamber modified......in fact, they've never even been off the engine! Anywho, thanks in advance, folks. __________________ Marc Bona Hobbs, New Mexico 1976 1/2 ton GMC High Sierra. 454 c.i.d./ TH400. *Soon to get a mild warming over.* 3.40 rear.