Cruiser is a 1977, with a '79 engine. Rebuilt head installed ~ 9 yrs ago-all new valves/springs/guides, and OEM head gasket. Daily driver. Recently have had to re-adjust dizzy point gap more frequently to keep good vac. Engine started to slowly sound like a cylinder was misfiring. Installed new plugs/points/wires/cap/rotor. While the plugs were out, checked compression(all plugs out and very cold-55 degrees ) #3 cylinder was essentially zero(maybe 10 psi) #2 was ~ 75 psi. All others were > 130 psi. The engine gradually gets better vac after warming up for ~ 5 mins(19 inches--16 at startup)) and the misfire sound seems to go away. Exhaust pipe is fairly clean-no oily residue. Compression has not been checked hot.
Any ideas here from the group? Head gasket maybe?
Any ideas here from the group? Head gasket maybe?