![]() ![]() Somebody here on the list must have a '60's or '70's vintage Isky catalog that should give you the specs and tell you exactly what you have.įrom what I gather the 505T roller cam I had was originally intended for a small inch, maybe a 265 or 283 inch or so, 'rev to the moon' "gasser-type" race engine. Besides having casting marks and small 'sand grain' casting irregularities visible at various places, the hardening process used on the cast iron turn the camshaft a 'flat black' color - while the steel billet roller blanks have a very smooth, machined finish and a slightly shiny 'natural steel' or sometimes, a slight burnished 'copper' color. One quick way to tell a roller from a flat tappet cam, other than the shape of the lobes, is that Isky and most other manufacturers roller cams are machined from steel billet blanks, while the 'regular' (solid and hydraulic) flat tappet cams are made from cast iron blanks. That's why I asked if there was a "T" after the '505' stamped on the nose. The 505T that I had was a definitely a roller cam. ![]() ![]() I'm not sure, but your 505 Magnum may be a solid lifter (and possibly, even hydraulic lifter) flat tappet cam. ![]()
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