Ok, I have a 383 with a edelbrock performer(newer) manifold. I have changed the intake manifold gasket 3 times in six months with Very little driving. What gives? I am using the felpros. I keep getting coolant in oil. Runs fine for a while then starts to leak after a couple of months. I have tried putting Rtv around the coolant ports(thin), tried without(let felpro seal it), and again last night did the same. What would cause this? The bolts were tight when I changed last night so it was not due to loose bolts. I am afraid to start up this morning just to have it happen again. Its not the head since it fixes everytime I change the gaskets.