1 pr of Merlin VR 310 heads, 2.25/1.94 valve combo, I put the larger exhaust in because I was running spray. On a flat tappet 427, they went 9.64 at 142 at 3610 lbs. Manley severe duty valves, Comp Ti retainers, 1.55 Crane spring, Comp Cams stud girdle. Would like to get $1100 out of them, time to step up, heads are in perfect condition, and very lightly ported.
