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Old 09-26-2001, 06:30 PM   #1
stllookn
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Post HEI Questions

When did they start putting the HEI's in our trucks and how would I know if I have one. Just pop the cap and have a look see...mine is a Delco cap but not sure if it is electronic.
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Old 09-26-2001, 07:02 PM   #2
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stllookn,

I'm not sure when GM started using HEI. I think it was in the late 70's. To find out if you have a late model one remove the spark plug wire cap. Under the cap check for either points (round thingy) or a flat module that is kinda moon shape. If you have a module then its a late model HEI. What is the year model of your truck? Is it the original engine?

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Old 09-26-2001, 07:10 PM   #3
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HEI came out in I believe latre 74 for some cars and then everything in 75
how many plug wires attach to your distributor? if its only 8 then its HEI if it has nine the ninth one being a coil wire(RIGHT IN THE CENTER OF CAP) it has points

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Old 09-26-2001, 10:28 PM   #4
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Bur is right. 8 it's hei...9 it is crappy points. Then you'll notice the HEI has a massive cap verses the points cap.
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Old 09-27-2001, 12:31 AM   #5
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Mine is a '77 but with a replacement rebuilt engine. The origninal was a 305 and it now has a 350...the guy I got the truck from was not sure about anything...he just took really good care of it. The engine has a cam...can tell from the idle, headers, Edelbrock carb and manifold and the rebuilt tranny has a shift kit. Seriously...this guy thought he had two door skins to go with the truck, just in case (small rust bubbles on bottom of door)...when I got there he had two brand new doors and wind wings still sealed in plastic as well a new bumper. I am very pleased but still trying to figure out everything that was done to the vehicle.
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Old 09-27-2001, 12:42 AM   #6
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That was it...only eight wires...none on top for the monster coil so it is an HEI. Now I spend my time looking for casting numbers to find what year the block is and if it has Vortec heads...very unlikely.
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Old 09-28-2001, 08:52 AM   #7
crossy
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i'm betting 998 or 882 as the last three numbers on your heads!DAVE
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Old 10-01-2001, 08:07 PM   #8
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Found the block numbers...bet the head numbers are under the valve covers...right?
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Old 10-05-2001, 01:20 PM   #9
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Yup.
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