G and GA Heads

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Nov 30, 2019 | 10:10 PM

78Delta

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Joined: Aug 2012

Posts: 36

G and GA Heads

Is there any call for these heads? 455 Big Block G and GA heads? I have a chance to pick up a set.

Dec 1, 2019 | 03:32 AM

rob1960

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Joined: Mar 2009

Posts: 845

From: Ohio

They're decent heads for having rather large combustion chambers(I think they're around 80ccs) but like the earlier C & E heads they can have 2 different valve sizes depending on what they originally came on. 442s & Toros usually got the big valves. The big valve GAs were also used on '72 W30s

Dec 1, 2019 | 06:07 AM

joe_padavano

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Joined: Mar 2007

Posts: 50,627

From: Northern VA

Quote:

Originally Posted by rob1960

They're decent heads for having rather large combustion chambers(I think they're around 80ccs)

With the exception of the 1968-69 D heads, all BBO heads are 80-ish CC chambers. The D heads are 72-ish. As-cast chambers can vary and are usually 2-4 CC larger than the blueprint specs.

Dec 1, 2019 | 07:40 AM

cutlassefi

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Joined: Nov 2008

Posts: 8,457

From: Central Fl

Quote:

Originally Posted by joe_padavano

With the exception of the 1968-69 D heads, all BBO heads are 80-ish CC chambers. The D heads are 72-ish. As-cast chambers can vary and are usually 2-4 CC larger than the blueprint specs.

That is correct. Not sure where the continuous misinformation is coming from though.