Breather on top of motor

I saw that it blows air out that hole. Since its blowing air out that hole dont it loose compression? If i blocked that hole up wouldn't it gain commpression?

Thats breather is on the valve cover it has nothing to do with compression.

Thats breather is on the valve cover it has nothing to do with compression.

How come when i kick start it it blows a bunch of air out?

Thats crankcase pressure escaping through breather tube. It has nothing to do with compression.

The piston pushes 426cc of air around underneath it as well as on top. It has to go somewhere. If you block that breather off on a 426 with manual decompression, the most likely thing is that you'll blow the half moon seals out of the head.

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