Best of [Email]11.25@120.0[/Email] in a 69 A12 Runner w/ 12.5:1 and .626/.310 Cam Dynamics cam, 4.88's, 11.5x29.5 M&H's. The original 906 heads had original valves and valve guides, minor port relief and 3 angle valve job and were milled .020. That was in 1974.