If standard bore, pistons commando 2 valve relief semi dome, std 4 valve unidirectional pistons. If bored all bets off as it could have higher compression flat top piston also.
Check the valve lift, should be about .420 and is it a 4 bbl?? The distributer will be a dual point. If you can pull a plug and see if you can tell if the piston is domed.
