owed.Shaft mounted rockers are allowed.2.7 Stud GirdlesStud Girdles are allowed.2.8 Pistons, Rods, Cams, CrankshaftSolid Steel connecting rods required, no titanium, aluminum, stainless steel or other material allowed in or on connecting rods.The maximum connecting rod length allowed is 6.000??? (inches).Any flat top, dished or dome round aluminum piston permitted.