| Re: Oldsmobile 455 heads G vs J [message #324288 is a reply to message #324281] |
Sat, 23 September 2017 22:15   |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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Matt Colie wrote on Sat, 23 September 2017 18:39I may have a chance to collect a nearly complete (short carburetor and distributor) 455 with no attached history. It has G heads. My research so far has found that it should have the same combustion volume, but may or may not have hardened seats. The valve sizes are listed as the same.
Does anybody in our community have experience enough to tell me if these are even worth saving? I know that if one needs hard seats they can be installed, but I do not know the current cost of this.
Thanks
Matt
Matt,
I would certainly save them. They might not be worth much as cores, but in my recent search for heads, I found that ANY 455 head is kind of hard to come by.
I think most, if not all 'G' heads are 'big valve' (2.071) heads from about '71 or '72 ('Ga'). Ga heads are 'W-30 heads and are worth a lot of $$$ in the hot rod crowd. One source I found said the G heads DO have hardened valve seats.
If you look for a flow chart, there isn't much difference between the best flowing and the worst flowing Olds BB heads. I ended up with a pair of K heads and the coach runs great with them on (of course one of the old heads had a leaky valve, so it should run better with new heads).
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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