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Is the a way that you can get the valve cover(s) off and get the casting numbers......
 

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Pop the valve cover off, get the cast # and casting date. Date will be something like A 16 8 - Jan 16 '68 for example.
Don
 

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If that first number is a 3 than its a 3932441

67-79

1.94/1.50

327 or 350 had them

250-255 hp

76 CC Chambers

1.94 in. /exhaust 1.50 in.

These have flat seat spark plugs.

4 20/8 0

April 20th /or 28th of 1970
 

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From what I gather they flow similar to the old double humps. Only thing is they don't have the closed chambers, they are a 76 cc open chamber for low compression. Used on 250 horse engines and also came on some 400 small blocks as well. Nothing special in other words.
 

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Discussion Starter #7
Dang I was hoping for something special like the 375up :( . do have some cool M/T valve covers on it.from what I can Google they are early valve covers from the casting numbers 3276000 thanks for y,alls help
 

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Back in the late 80's or early 90's, either Car Craft or Hot Rod did a flow bench comparo of several of the cast iron "smog" heads common in the late 60's through the 80's. The 441 flowed the best of all of those tested. In fact, at that time, the only factory heads that out-flowed them were the double-hump heads (461, 186, 462, etc.), and the 291 turbo heads. FWIW, the 487X came in second, and the 882 came in nearly dead last.
 

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Back in the late 80's or early 90's, either Car Craft or Hot Rod did a flow bench comparo of several of the cast iron "smog" heads common in the late 60's through the 80's. The 441 flowed the best of all of those tested. In fact, at that time, the only factory heads that out-flowed them were the double-hump heads (461, 186, 462, etc.), and the 291 turbo heads. FWIW, the 487X came in second, and the 882 came in nearly dead last.
Don't forget the over the counter angle plug 492's. :D

Below is a good link for looking up old GM heads and what their castings are.

http://www.fastnuf.com/Headguide.html
 
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