[blykins]

Easiest way to tell is to put up a spec sheet of the engine, or better yet, the cam card. You could also call the builder and ask what/which cam it is.

Second easiest way is to pull the distributor out and shoot us a picture of the cam. Cast core camshafts, even rollers, are very rough between the lobes, because they...…..are...…..cast...…… Billet cams are made of a billet of steel and have a more machined appearance.