JE 23 Degree Head Pistons

JE 23 Degree Head Pistons Factory GM heads are used to define standard valve spacing and angle (thus 23º) for many small block Chevy’s. Additionally most 23º aftermarket cylinder heads incorporate what is commonly known as "60/40 Shift" (See diagram at right) in order to allow for larger valves. All JE flat top and inverted dome shelf piston designs accommodate "60/40 Shift" and will work with most aftermarket 23º cylinder heads, including those with oversized valves and angle milled surfaces. TFS "Twisted Wedge", AFR227 and Brodix 10X cylinder heads will require custom pistons.