headers are thinner then intake manifold

[zdude1967]

I bought used headers for my 260z and they seem to line up. The head is square exhaust ports so are the headers. The problem is the intake manafold is 1/2 inch thick and the headers are 1/4 inch thick. How does this work with the circle piece that holds both of these down and together.

[Walter Moore]

That appears to be a common problem with some headers. See this thread for example:

http://www.classiczcars.com/forums/showthread.php?t=14869&highlight=header+mounting

I know it is from 2004, but the "solution" seems to be that you need to make or find stepped washers to make up the difference in height.

[Zs-ondabrain]

You need "Half Moon" spacers. It's basically a 1/2" thick washer, with 1/2 of the circle diameter shaved to 1/4". The 1/4" part is for the intake manifold side and the 1/2" side would be for the header side.

I had to use those on the 71' Z that I used to have. Worked like a charm.

Dave