Big Block intake cast number

[74 454]

Pulled this number off the top of my manifold, driver side rear. GMT 3866287 or possibly 8866287? But I can not find this number anywhere, or even close. Can anyone else? Is this the wrong number? Is this a patient number?

 

[JohnZ]

The only big-block intake that ends in "287" is the 3955287 (cast iron, oval-port), which was used on 402's and 454's in all car lines in '70-'71, including the hydraulic-lifter Corvette 454 during those two years.

 

[Vettehead Mikey]

Your manifold should have a casting number of 353015 or 336789, if you're interested.

 

[74 454]

The intake on the engine is not the original. I have the original from the previous owner with the air pump opening. He took the pump off and wanted an intake without that feature. So he found this one which he said was on an older corvette. So maybe 3955287 is the correct number I'm trying to read. The 8 looks like a 9, and the 55's look like 66's. I'm pretty sure I got the 287 right. And this would make sense that it's older than 74, before the air pump, and was used on corvettes. The original intake is probably a 336789. I read it last night and thought I saw 338789, but again, the 8 looks like a 6. Thanks everyone.