a lot of 12v have the grid heater integral to the plenum plate...
like mine
hint: remove the plenum plate if you want to gut the heaters so you don't lose a lock washer down the #3 intake port!! :{:{:{
I got it fished out after removing the plate
might be missing a flat washer, but fished like crazy and rolled the engine over 360* w/ no binding, all intake valves have correct lash.
pray for me and don't do what I did! LOL
like mine
hint: remove the plenum plate if you want to gut the heaters so you don't lose a lock washer down the #3 intake port!! :{:{:{
I got it fished out after removing the plate

might be missing a flat washer, but fished like crazy and rolled the engine over 360* w/ no binding, all intake valves have correct lash.
pray for me and don't do what I did! LOL