.006" for the valves.The sight plug is hard to see into on the 400at so take your time to make sure it's at TDC.
start at 2 1/2 turns out on the screw but you may have to go more (unscrew)if you get any backfires on deceleration.
start at 2 1/2 turns out on the screw but you may have to go more (unscrew)if you get any backfires on deceleration.