Machine shop owner/operator sense 1970
rebuilt 239 all new valve train/new exh. Seats.
Mis fire on # 4/#7/ no vac leaks/comp. 110# all, plugs out/12v batt. 6v starter. #7 had 75# idling/ reground 4 valves/seats #4/#7
mis fire continues. Added .030 shim to springs on all.can valve guide seal...