Comp XE268H v Crow 18619 - 318

On the subject of lobe rates, the Howards profile I had referenced calls for 122 seat and 335 open pressure @.506 lift with new springs (figure on 7 pounds less after break in). So there’s no doubt it is fast rate/high pressure profile. For comparison, the rates for it would work with my “shelf baby” Racer Brown solid thats [email protected] (lash lift) /[email protected] (125 seat/335 open after break in). As far as the high or low rate lifter rate debate, both have their merits. Incidentally, Isky is one of the first manufacturers that developed high lifter rate cams. I do recommend contacting Mike at B3 racing engines whenever setting up a performance valve train, because valvetrain stability problems are caused by incorrect geometry as much as any other factor. Here’s some of his handiwork for sale posted by another member.
[FOR SALE] - PRW rockers 273-360, 1.6 Ratio, with B3 racing relocation kit