Hey Stephen, I worked on a 173cc runner with the 2.190 valve some time back, I belive it flowed 365cfm@ .850. Could maybe get more with futher testing.My SS head with the 2.090 valve flows 349cfm@.850 the 427 valve dosen't pick it up all that much.
Tell your DAD hello.
Thanks
Jeff Colvert
Jeff Colvert Racing CNC Cyl.Heads
69 Mustang SS/G first in the 9's
68 GT500KR 2330
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