Chrysler Plymouth Dodge Mopar 318 and 5.2 Magnum engine Icon forged flat top piston set. This set works in either the older style 318 A engine or the newer 5.2 Magnum series engines. This forged 318 piston set is for use with a standard stroke crankshaft of 3.313 in., .030 oversize bore with a stock rod length of 6.123 in. and a pin size of .984 in. The pistons have 2 valve reliefs in them for valve clearance with higher lift cams. Compression is 10.1-1 with a 60cc chamber head or 9.2-1 with a 68cc chamber. Ring grooves are 1/16 1/16 3/16. They work with either a floating piston pin or pressed pin type connecting rod. Set includes 8 pistons, 8 piston pins and pin lock rings.