The 272 camshaft: A great upgrade for the M20 engine. This is a brand new camshaft made in Europe, not a regrind. The design and results are identical to the Schrick 272; higher lift helps mid range power and extra duration helps the top end. This cam will pull right up to 7000 rpm.
The 284/280 camshaft: This cam is especially well suited for an aggressive-street/dual-use M20 engine build (ideally a stroker). It will make plenty of mid to high range power. This is a new made-in-Europe camshaft, not a regrind.