1970 & 1973-1977 3965543/3965544 Alum. Valve Covers

[David L.]

Are the 1970 3965543/3965544 aluminum valve covers the same as the 1973-1977 valve covers? I have a set of LT1 aluminum valve covers each with the following casting numbers:
"P3965543 LH" "CBC"
"P3965544 RH"
The lengths of the "cutouts" are 3 9/16" and 5".

The 1969 aluminum valve covers (3932418 casting number without drippers) have "cutouts" that are each 3" long.

The 1971-1972 aluminum valve covers (casting number 3989005 & 3965542) also have "cutouts" that are each 3" long.

Dave

[David L.]

Re: 1970 & 1973-1977 3965543/3965544 Alum. Valve Covers

I got this information from a 1970 Z28 expert that answered my question on the Nasty Z28 website.
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1970 Z28 Valve Covers have some different casting features compared to the later 73-74 Aluminum Valves.
1)
Three parts numbers are casted in both valve covers:
P - 3932417 - LH
P - 3965543 - LH
P - 3965544 - RH
2)
Both slots are 3" long
3)
Drippers are:
11/16" wide at base (73-74 are about 5/8" wide)
3/4" in height (73-74 are about 5/8" in height)
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Is this information in the 1970 Corvette judging guide? The 3" long slots can be easily seen when the covers are installed on an engine.

Dave