Originally posted by sb72elcamino350
I am looking for a shim head gasket for a sbc 400 bored .030 over. I am really worried about my quench so that is why I am looking for them. Do they even make them for sbc 400's? If so where do you get them?
Is it too late to deck the block still?
You should use Fel-Pro gasket #1014. It is .039" thick and has revised cooling passages that will make a big difference in the ability of your engine to cool evenly.
You might need to drill the deck of the block for an extra cooling passage. Some 400 blocks already have the hole. Mine didn't. The hole is in the middle right between the two exhaust valves. The gasket allows more coolant to pass through this hole and then has restrictions at the holes by the outside exhaust valves. What this does is help to cool down the hot spot normally in SBC blocks where the inside two exhaust valves are side by side.
Don't run a shim with a high compression 400. Not unless you like late night teardowns.