head casting numbers?
Thread Starter
Pro
Joined: Oct 2002
Posts: 673
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head casting numbers?
What is the significance of the GM number (the 7 and 16) on my heads? Right side GM7 3782461, date A 5 6 .. Left side GM16 3890462, date D 11 6.
[Modified by valrico4, 11:13 AM 3/22/2003]
[Modified by valrico4, 11:13 AM 3/22/2003]
Burning Brakes
Joined: Dec 2002
Posts: 912
Likes: 1
From: San Antonio TX
St. Jude Contributor '03 & '04
Re: head casting numbers? (valrico4)
Don't know about the GM 7 and 16, but you have a set of mis-matched heads. Should be the same casting number, and dates within about a month of each other.
Heel & Toe
Joined: Mar 2003
Posts: 24
Likes: 0
From: St. Louis MO
Re: head casting numbers? (valrico4)
The 3782461 shows to fit 62-70 307-327-350 engines,manufactured Jan 5, 1966 ... I can't find the cross for the other casting. You would have to make sure that the combustion chambers are the same and obviously the valve sizes (which can be made the same) I will check a couple of other sources on the other casting number but so far I am drawing blanks!
Drifting
Joined: Dec 2002
Posts: 1,946
Likes: 28
From: Long Beach CA
Re: head casting numbers? (valrico4)
The 0490 head, according to my book, was used on the early Z28 Camaros and '64-68 lower horsepower 327s and 350s with either 1.94 or 2.02 valves. The problem I see is that the 2461 head has 62.1 cc chambers and the 0490 head has 63.3 cc chambers.
