How to Cut valve spring seats with comp cams cutter Comp cams 1.580 spring seat cutter cuts guide. 630 4720 1.580 spring seat cutter cuts guide. Valve Spring Seat Cutter 0.630 in OD Guide 1.580 in OD Valve Seat Steel / Carbide Universal Each. The seller is tcbspeed and is located in this country US. Looking for a quantity higher than what we have listed?