Nos ford svo discontinued gt40 valves 1.940 - 1600 stock length ss swirl new

Jac Mac

Active Member
These are not genuine GT40 valves, the M prefix to part number suggests that they are later replacement Ford Motorsport items. GT40 valves part number had 'C' prefix, exh should be 1.625" dia and inlets had 30° seat angle and also all had single valve keeper groove. That double groove would suggest these might be made from SBC valve stock.