i posted something in the 5.0 tech and got zero input, so i'm posting here. currently on my '66 coupe, i have a matching set of mystery heads. the date code is early '87 or '77? (7A29), but an autolite 25 series plug is way too short (by a 1/2" or so to screw into the hole. the current plugs are autolite 5144 and i would like to replace them because i am getting some off-idle stall. per autolite's website, the 5144 never was used in a V8 and in the 80's it only went into a ford escort.
anyone have any idea what head i have and what plug is supposed to be in that hole? the previous owner claimed the engine is a matched set and the block is for a manual transmission.
my crap-tastic combo is these heads with early 90's stock GT cam, duraspark, triY's, and carburetor (570cfm 4150 on an E-RPM).
i can guarantee you that any help will be greatly appreciated!
anyone have any idea what head i have and what plug is supposed to be in that hole? the previous owner claimed the engine is a matched set and the block is for a manual transmission.
my crap-tastic combo is these heads with early 90's stock GT cam, duraspark, triY's, and carburetor (570cfm 4150 on an E-RPM).
i can guarantee you that any help will be greatly appreciated!