1968 Barracuda Notch - Plano, TX

clair.davis said

How do the new heads compare to the old ones? Did MM flow them when they rebuilt them, or did they have some baseline numbers for the spec porting job they did? I know a bunch of folks have flowed RB heads over the years, but it's been a decade since I paid attention to those numbers...

Clair

Click to expand...

Stock 452 flows about 205cfm @ 0.600". Basic port job using the old template kit from Mopar will pick you up about 10%. The MM guys told me the most I could expect from the job they did back then with the larger valves at that porting level would have been 250cfm. A full race port could put you over 300cfm on the iron heads. He told me I could expect 80-100hp more than the heads that I am replacing.