I had the 6 & 8 BTDC around the wrong way. To clarify HEI distributor details: 5.0 Litre V8 (Man or Auto) Part No. 92009979 - Initial Distributor Advance = 6 Degrees BTDC. Identification on White label on vacuum advance unit - None. 4.2 Litre V8 (Man or Auto) Part No. 92004474 - Initial Distributor Advance = 8 degrees BTDC. Identification on White label on vacuum advance unit - Blue Dot.
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