Join Date: Oct 1999
Location: Monument, CO, USA
Which intake gasket should I use?
With the intent of fixing a vacuum leak I pulled the intake off of my 69 DZ 302 engine. Based on recommendations in camaros.net I had already bought a set of Felpro 1205 intake gaskets. These new gaskets did not match the gaskets that were previously used so I am turning to this news group to educate me. The 302 heads each have three coolant ports - front, back, and center. The 302 aluminum intake manifold only has two coolant ports which match the head - front and center. The old intake gaskets are cut for all three coolant ports while the Felpro 1205 gaskets are cut for only the front and back coolant ports. The 1205 gaskets are "blocked heat passage".
My questions are:
1) How does coolant flow through the intake manifold? Obviously the front passages provide a path between the heads and the radiator. What is the purpose of the center passage other than heating the choke spring?
2) What intake gasket should I use on a stock 69 DZ302? Is the Felpro 1205 the one to use, thereby blocking the center coolant ports?