Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - hi or low compression??
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Old 10-13-2012, 10:17 AM
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Originally Posted by OMARS67 View Post
yeah i figured it wouldnt be worth the time. the reason i ask is because i have a set of 049 heads. and i read there the best hi perf head for oval BBC. what so special?? 049 have advertise smaller cc chamber. maybe the intake runner volume?? i understand about things that can affect the compression but lets assume both heads are virgin cast. i know my existing 148 heads are and these 049 head are as cast.
the 049 and 781 are:
Good when ported and big 2.19-1.88 valves are installed.
Some of these heads have a 116chamber.
Like posted you have to CC your heads to know the chamber volume.

The small chamber closed chamber oval ported heads work very well too.
063, 290 215 etc 1970 and back.
again best with porting and larger valves.
The closed chamber gets reworked a bit.
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