I Might Just Know What I'm Talking About
Join Date: Sep 1999
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Re: How about some help on the GM HEI install
Doug, personally, I feel that the instructions are way too complicated. Take the cap off your existing distributor, noting where spark plug one is. Rotate the motor, either by jogging the key, or by hand, until the rotor points to where plug 1 would be on the stock distributor cap. This puts the motor in the right spot. Ignore all that stuff about compression stroke, TDC, etc. You don't need it. The rotor will only point to the #1 spark plug when it needs to. So, get it so it does, and pull the distributor. When you install the HEI, pick a location for installing the rotor so it points to a plug wire location on the cap, it doesn't really matter which one. This will be your #1 plug wire spot. Install the other wires in the proper firing order, going around the cap in the same direction as the old cap was. (Mark all the plug wires on the old cap as to which one went to which cylinder when you remove them) You should now be able to fire up the motor in this position, though your timing may be pretty far off. If you think it all through, it really is very simple.
As for wiring up a good source of 12v+, look in your wiring diagram. I used a spot on the wire harness going to the old electronic ignition box on the drivers fender wll on my 88YJ. It was yellow. Then I unplugged the ignition module and taped up the connectors.
88YJ, 4"susp, 33"BFGMT, 9k#winch, rear homemade swingout, reb.258, 999, 4.10, weber32/36, GMHEI.