We recommend that you examine the terminal isolator for cracks whenever you change your points and condenser. If the stud is corroded it can impede connectivity and ignition. If the plastic isolator is cracked it can interrupt ignition by grounding to the distributor housing. This insulator is the square unit with the key-way in the center to match the keyhole in the distributor housing. The outer square piece is slightly larger than the inner just like the original.
DELCO DISTRIBUTOR TERMINAL INSULATOR (SQUARE SHOULDER) --- NOTE AS DISTRIBUTORS CAN BE CHANGED THROUGHOUT THE YEARS IT IS BEST TO SEE WHICH STYLE YOU NEED THIS IS JUST A GUIDE OF WHAT WAS ORIGINAL. SQUARE STYLE INSULATOR NOTE: SQUARE WAS THE LATE STYLE FITS DISTRIBUTOR HOUSINGS WITH .300 DIAMETER HOLE WITH A KEY --- International Applications: A, SUPER A, AV, B, BN, C, SUPER C, H, HV, SUPER H, M, MV, SUPER M, SUPER MV, IH, I6, W4, W6, T6, 04, 06, SOME IH MODELS USING 41111411 DELCO VERITCAL DIST. --WITH SQUARE INSULATING TERMINAL --- Replacement Part #: IH: 1914142, 1914144, 1916806, 1916805, 817363, 120622
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