No, not really, the 307 4 valve relievs are not made for our engines either. wrong angle, SBC 23 degrees as to our inlines like 15 or 18 degrees???
Plus the valves are of different spacing between the intake & exhaust.
When I checked for piston to valve clearance ( Chevy 250)on a cam I ran w/.585 lift, & 248 degrees duration @ .050 I had a mile of clearance, really not even close.
I never ran a cam w/huge lifts or big overlap, so I really do not know when the valves would get close to the pistons???
CNC Dude,Twisted6? Chime in. :-)
MBHD
