I've noticed on my low deck motor that the FelPro head gaskets have a restrictive slot where the coolant flows from the block into the heads. Does a factory head gasket have the same slot? Any harm done to open it up and get more flow? Or maybe there is a reason for it? Someone smarter than me must have designed it that way.
Which slots are you talking about? Pictures are worth a 1000 words
If your talking about the narrow short slits in the middle of the block and heads the factory did that for allowing a small amount of coolant to transfer from the block into the heads instead of making all the coolant go all the way back to the rear of the block to transfer into the heads through the big hole at the top rear of both sides of the blocks and heads
