I have a 1986 Chaparral V6 4.3 MerCruiser, Thunderbolt IV 175 hp..
Serial B579723
Carborater is a two barrel McM 175 3304-9565
Working on the boat I replaced the head gaskets, intake gaskets, riser gaskets, and adjusted valve trains, by taking the slack out of the push rods, then turning the...