Joined: Wed Dec 21 2005, 07:34AM
Location: indiana
Posts: 791
Does anybody know the different years/applications for bigblock exhaust port sizes?
I see that Summit has some listings for different sizes, I bought a pair of copper gaskets and of course they are the wrong size and one gasket won�t seal on the header�s ground tube surface, there is a little opening that leaks. I rechecked the application on the gasket and it says it fits from 361 to 1978 bigblock. It would work on a factory manifold but not on a header.
Port sizes that are listed are: 1 1/8 tall x 1 5/8 wide, 1.475 x 1.7 and 1.45 x 1.96
I spotchecked heads I have laying around, and the 915, 906 and 452 all have the smallest port, 1 1/8 x 1 5/8. Is the larger port for a Max Wedge? If so, why don�t they list it as such???
Joined: Mon Feb 20 2006, 08:12PM
Location: Ontario,Canada
Posts: 950
I allways goop the surface of the header flange and aroung the ports with muffler cement when using headers and a gasket.. unless they are pretty close to perfect they always end up leaking....GGGRRRR... so the gasket cement fills in the small gaps...