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ok, this may be a dumb question. but when do you need a pop off valve? im putting a b&m 144 on my slant six. i bought a kit for a 350 chevy. there was no pop off valve on the manifold for the 350. i have been reading online trying to figure out when you need one. do the smaller superchargers not...

http://www.pentastarparts.com.au/classic/blown-225.html this is what i want.