The Pro-Filer head is the same core boxes as the Z304. Pro-Filer cast them. We took that head and did our own thing. Darin designed the chamber before he went back to RM. The intake is a hand port I put into that casting and then was put into the core boxes.
It flows well, makes good power, just hasn't caught on.
SBF 20° head preference
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Re: SBF 20° head preference
Does anyone have cast iron Trick Flow 170 cc heads for sale ?? They made them in early 90 s