HH custom pistons19 Feb, 2018 in Head Hoggers tagged harlay head porting / harley 4 valve porting / harley big horsepower / harley big HP / harley big inch / harley big inch engines / harley bore and hone / harley case service / harley cp pistons / harley cylinder boring / harley engine building / harley engine machining / Harley flywheel rebuilding / Harley full service / harley machine shop / harley milwalkiee 8 head porting / Harley parts and accessories / Head Hoggers / mobile motorcycle tuning by headhoggers Just finished up another big inch bore and hone with our custom pistons we do with Shaker Products/CP. These are 4.125 bore 12:1 comp, horizontal gas ports and our custom Shaker profile dish. These pistons are badasss !