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texasred · 10-05-2007, 01:50 PM

Sounds like it could be multiple issues here.

What are you running for timing? HEIs are not drop in replacements exactly. Their timing curve and vacuum advance cans are set up for emissions in a very low compression/no performance engine.

Are you running the original wiring ti the HEI? It's a resistance wire and an HEI needs the full 12 volts. That could explain the "lights on" issue.

Are you running your vacuum advance through the vacuum switch on the intake manifold? Are you actually getting ported or manifold vacuum?

Finally, HEI coils are in-cap, which means there is a LOT of heat buildup. If it's a cheap one, it could even be bad from the box.

I'd start by checking for a full 12 volts at the distributor and then throwing the old coil back on.

C.J.

10-05-2007, 01:50 PM	#2 (permalink)
texasred Super Moderator Join Date: Apr 2004 Location: San Antonio, Texas Posts: 807	Sounds like it could be multiple issues here. What are you running for timing? HEIs are not drop in replacements exactly. Their timing curve and vacuum advance cans are set up for emissions in a very low compression/no performance engine. Are you running the original wiring ti the HEI? It's a resistance wire and an HEI needs the full 12 volts. That could explain the "lights on" issue. Are you running your vacuum advance through the vacuum switch on the intake manifold? Are you actually getting ported or manifold vacuum? Finally, HEI coils are in-cap, which means there is a LOT of heat buildup. If it's a cheap one, it could even be bad from the box. I'd start by checking for a full 12 volts at the distributor and then throwing the old coil back on. C.J. __________________ Home of the 1971 Cutlass Supreme convertible Super Karate Monkey Death Car.