Ignition Wiring - Team Camaro Tech
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post #1 of 7 (permalink) Old Nov 26th, 02, 10:43 AM Thread Starter
Join Date: Jun 2001
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Hi guys,

I was just in the garage changing my spark plugs and wires when i decided to check out the correct wiring diagram in my hanes book. it seems as though whoever hooked up the wiring last time seems to have hooked them up according to HEI system, but I know that pre-1975 had conventional ignition.

i got the car recently (71 SS 350) and the only aftermarket parts i am aware of the holley street dominator manifold and carb. i don't know if he switched to an HEI system. can anyone tell me how i can tell the difference?

i'm sitting here not sure if i should go back to what the hanes says or rewire it the same as it is currently

thanks in advance

[This message has been edited by robbZ28 (edited 11-26-2002).]
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post #2 of 7 (permalink) Old Nov 26th, 02, 11:18 AM Thread Starter
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well, it looks like it might be an HEI ignition. this being the case, when looking for correct plugs and wires, do i need to change anything? when i bought my new wires at kragen, they were 7mm, but the ones currently on the car are 8mm.

should i be getting different plugs and wires?
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post #3 of 7 (permalink) Old Nov 26th, 02, 02:14 PM
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Is there a big square coil under a cover in the middle of the distributor cap?

'69 Z28 Fathom Green
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post #4 of 7 (permalink) Old Nov 26th, 02, 05:11 PM Thread Starter
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i figured out that it is HEI, so i just swapped the wires for the correct wires and everything seems to work perfectly.

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post #5 of 7 (permalink) Old Nov 26th, 02, 05:29 PM
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is'nt HEI when the coil is on top of the dist. cap?
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post #6 of 7 (permalink) Old Nov 26th, 02, 06:02 PM
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The HEI uses "male" ends on the distributor cap, whereas the conventional points style ignition uses "female" ends on the distributor cap. The 8mm wires are correct for the HEI. Also, spark plug "gap" for an HEI is .045 where point style gap is .035.
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post #7 of 7 (permalink) Old Nov 27th, 02, 01:08 PM
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Just wanted to add that the 'factory' HEI setup descriptions mentioned are accurate. However, at the core of any HEI system is the hybrid ignition module. It is the module that creates a high energy spark. I mention this because I have an HEI retrofitted system that looks like a conventional breaker point system. Sometimes looks can be deceiving.

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