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I have a set of 305 heads casting 434. I'm trying to find out what the flow numbers are for these heads in stock form. I can't seem to locate any consistent info for these heads other than what valves originally came in these. I haven't got around to actually measuring the runners or combustion chambers yet. The heads are fresh and have been majorly worked over. I paid $25 for the set just for the Harlan sharp roller rockers that came with them.

Attn: Derek Jewett

If you are still around send me a pm.

if my memory is right the heads are 1.72 or 1.84 intake valves and 1.50 exhaust. The 434 is a large-chamber, small valve head. hope that helps.

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LIVE HARD PLAY HARDER
THANK A POLICE OFFICER THEY PUT THEIR LIFE ON THE LINE FOR YOU AND ASK FOR NOTHING IN RETURN!!!

All the info I have found says 1.72 valves. They now have 1.94/1.50 valves. The majority of the info is all over the place for listed combustion chambers. I have heard people actually confirm them as 60cc. When I get some time I will measure them myself also because they have been milled. It amazes me that someone would dump the money into a set of 305 heads to upgrade to bigger valves and seats, screw in studs and a bunch of time doing port work.

I can only dream of having that much time on my hands when a nice set of small block heads can be had off the shelf. I have been out of the loop for a while, giving these heads have been changed im not sure you will find any usefull numbers on the net. What are you trying to do with them??

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LUV Truck Desserter!
76 Daily driver (SOLD)
73 LUV (rusting away at the moment)
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63 Nova
74 Camaro

305 heads are 58cc chambers cause of the small bore in a 305 motor.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s