Spring. Valve. Race 75 PSI. Extreme lift cam
Race use only for over 7mm lift cams
Extreme springs have a shorter life span over normal valve springs; should be changed each top end rebuild.
Specifications OUTER SPRING:
Length: 34.3mm
I/D 17.4mm
O/D 23.2mm
Wire Guage: 2.7mm
Specifications INNER SPRING:
Length: 28.8mm
I/D 11.9mm
O/D 15.5mm
Wire Guage: 1.6mm