I ran the same Comp #901's on a .470"/.470" cam and a .489"/.480" cam. They were good for my setup to about 6100/6200 rpms before valve float. Very good spring for both of my hydraulic flat tappet cams. I have been told they are good up to .490" lifts.


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)