Head dimensions approx

Up to 30% weight reduction over stock components

CL (FR & RR)

RCM (Rubber Coated Metal) rocker base gaskets

this is it

Hasting Piston Rings Pan/Shovel 74" std. Insug/Manifold Head dimensions approxStd cyl. bore: 3. 4375" (87. 312mm). 1st ring: 1. 6mm. 2nd ring: 1. 6mm. oil ring: 4. 75mm. Tech tip: Piston grooves vs piston rings. It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3 piece