Need Advice on Machining the Intake Surface of the Head (gasket crush)

Need Advice on Machining the Intake Surface of the Head (gasket crush)

Just wanted to add that the intake is an aluminum 6 Pack manifold.

brian6pac said
That wouldn't be enough for me to worry about, get a good gasket and bolt it on, I always use a little gray RTV for coolant around the water passages anyway. Cometic will make gaskets any thickness you need.

I was more concerned about sucking oil from the valley into the intakes if I don't seal well on the ports.
I called Cometic about thicker gaskets. They have a 0.060 like Felpro, the next size up is 0.094 thick. Nothing in between. You have to pick a thickness from their stock of materials.

yellow rose said
Right, so the shims are changing his readings. Who says the shims are flat? Who says they are exactly parallel to each other?

I made the shims from an old Felpro 0.054 head gasket.

Marcohotrod said
U r measuring an uncrushed new gasket? I cut my heads .017", and like a good squeeze on the intake gaskets, did not cut the intake faces.

I measured a new Felpro MS 90109 gasket. Measures 0.054 / 0.059 across the raised sealing beads. I don't know the prior history on these heads, but the machine shop said the deck side had been resurfaced before. They didn't say anything about the intake side being resurfaced.

Marcohotrod said
Measure the thickness of a used gasket, that is real world. Notice how head gaskets are listed as compressed thickness. You can have the head intake faces angle milled, but your actual top to bottom average difference is only .005". If things are not perfect, and they never are, u want more gasket crush. Cut the surface and u get less gasket crush

The used Felpro gasket measures 0.039 / 0.047