Quote:
Originally Posted by Joshinator99
My MM Wild has a one way check valve in it, so it’s a regular closed system catch can 99% of the time, which is good. The breather portion only opens if it sees positive pressure from the crankcase, so it can relieve that excess pressure (hopefully before a seal blows out)… 
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Mine didn't come with one, but I think I've got a valve cover breather that has the one way Puck in
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2020 ZL1LE A10.
LME LT4 390 short block, LME CID Heads, Kong E2650, FBO.
15" conversion, MT ET Street R 325/15.
100 octane: 1045hp/1055tq.
100 octane + Meth (1x10+): 1117 hp/1067 tq