Engine will not idle down

[SlinktRR]

Mine leaked when I just used the pan one time, sucked in some oil from the lifter valley and ran lean with high idle in two cylinders particularly #7. I started using the felpro paper gaskets and sealant around all the ports after that. Plenty of people don't use the gaskets but when I redid mine I ended up using all 4 and the bathtub with beads of sealant around every port.

 

[hoover]

Gasket surfaces

 

[BSB67]

Generally, Mill the head’s intake surface 0.060”, and use the 0.030” paper on each side of the pan. Your favorite sealant to glue the paper gaskets to the pan. No sealant on the intake or head to gasket surfaces.