124″ twin turbo25 Aug, 2018 in Head Hoggers tagged 124" short rod turbo / engine building. / haley horsepower / harlay head porting / Harley 165" / harley big horsepower / harley cp pistons / harley engine machining / harley machine shop / Head Hoggers / Head Hoggers turbo heads by headhoggers (updated 2792 days ago) Just got this 124″ short rod twin turbo engine wrapped up and it’s on its way back to customer. 124″ short rod Custom pistons HH stage 3 turbo heads Case serts 58mm HPI TB Custom turbos