69 427-400 camshaft
Thread Starter
Emerging Vendor
Joined: Mar 1999
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From: San Diego CA
69 427-400 camshaft
I have my engine ready for reassembly and I'm trying to find a way to ID the camshaft that was in it. The only ID on it is a GM22 cast into it and a single stamp in the front of which I can't make out exactly what it is.
Any help here is appreciated.
Greg
Any help here is appreciated.
Greg
Team Owner
Joined: Oct 2000
Posts: 38,897
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From: Washington Michigan
The '69 427/400 camshaft was P/N 3883986 (which isn't on it anywhere), and was CASTING number 3883944. Either the complete casting number or the last four digits of the casting number will be cast into the unmachined area on the cam. The "GM22" is a foundry pattern number - doesn't I.D. the cam. 
Race Director
Joined: May 2000
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John - What we have always thought of the camshaft "casting number" is actually the part number for the finished cam.
The service part number is actually an "assembly" consisting of the finished cam and dowel pin".
The above from inspecting the actual drawings for all the vintage Corvette cams, and most of the cam and pin "assembly drawings".
In some cases the camshaft and camshaft/pin assembly numbers are sequential. This is the case for the Duntov, 30-30, L-79, early L-72 (groove in rear journal), '67-up base SB cam, and L-46/82 cams. Others are separated by a few digits and some by considerably more.
I guess it was just a matter of the order that drawing numbers got assigned based on how the requests were sequenced in the pile.
Duke
The service part number is actually an "assembly" consisting of the finished cam and dowel pin".
The above from inspecting the actual drawings for all the vintage Corvette cams, and most of the cam and pin "assembly drawings".
In some cases the camshaft and camshaft/pin assembly numbers are sequential. This is the case for the Duntov, 30-30, L-79, early L-72 (groove in rear journal), '67-up base SB cam, and L-46/82 cams. Others are separated by a few digits and some by considerably more.
I guess it was just a matter of the order that drawing numbers got assigned based on how the requests were sequenced in the pile.
Duke
Team Owner
Joined: Oct 2000
Posts: 38,897
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From: Washington Michigan
Yup, I agree - each different cam had a dedicated casting pattern (casting number on the cam) used only for that grind, and adding the dowel pin created an "assembly" that generated the final end item part number for the assembly (cam with dowel pin, which was the only way the cam was supplied).
I can remember buying "097" Duntov cams at the local Chevrolet dealer parts counter for $18.00 in 1960-61
I can remember buying "097" Duntov cams at the local Chevrolet dealer parts counter for $18.00 in 1960-61
