M8 in progress. in Head Hoggers tagged big hp harley / big inch engine kits / custom cp pistons / engine building. / harley 4 valve porting / harley big inch kits / harley bore and hone / harley case service / harley engine machining / Harley flywheel rebuilding / harley machine shop / harley milwalkiee 8 head porting / Harley Milwaukee 8 kits / Head Hoggers / Milwaukee 8 horsepower / motorcycle mobile dyno tuning New valves showed up today the M8 build. Nothing crazy here. Lol.