Rollmaster D/R Timing Chain Set Nitrided With Torrington Bearing (ROCS3130LB5)FORD 302 351C DR TIMING CHAIN Suit Ford 302 351C SVO with Scat or Eagle Crankshaft Part Number: ROCS3130LB5 All Timing Chain Sets are made from billet steel, have 9 Keyways (unless otherwise stated) and have a heat treated crank sprocket. Red Series: standard billet steel set 9 Keyway Gold Series: premium billet steel set with all sprockets nitrided by better durability and longer life. 9 Keyway Blue Series: economy sets for quality but with a budget,