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Mr cab my cuda is race only bracket car. the reason i have had to redo them twice is the intakes are leaking during a leakdown test. It seems the seats are dropping. 
It sounds like the seats are moving around when running or warmed up  I wonder how soon it will be before one falls all the way out  I have used B1-BS, Indy SR M.W. port size, Indy 440-1 CNC ported, Eddy RPM stock and CNC ported on two different motors all made good power, the bigger the ports(air flow) the more power you can make I have a new set of Koffels original B1 that they ported for me which I haven't use yet  I'm waiting for a really good iron block to use them on  It depends on how much power you want the heads to make and how big the motor is Lots of choices out there
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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