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09-26-2001, 06:30 PM
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#1 |
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Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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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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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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09-26-2001, 07:02 PM
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#2 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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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? ------------------ Gerardo 1983 Custom Truck TX Plates: "BAD BOW" http://www.geocities.com/abetterchemist/ |
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09-26-2001, 07:10 PM
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Just Another Crazy Canuck
Join Date: Dec 2000
Location: Richmond,British Columbia Canada
Posts: 1,228
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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 ------------------ 71 Custom/10 lb fleet .040 over 350/th350 good ol 1 wheel peel 3.73 12 bolt 275/60/15 front 31x10.50 rear on GMC Safari wheels #3 Dale Earnhardt will live forever in our hearts and memories "THE WORLD'S GREATEST RACE CAR DRIVER EVER"
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1985  454/465/205, 38.5x11-16BOGGERS   soon to be installed: 14bDETROIT,Edelbrock Performer cam,intake and valve springs,Comp roller tips,MSD HEI |
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09-26-2001, 10:28 PM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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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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09-27-2001, 12:31 AM
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#5 |
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Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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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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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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09-27-2001, 12:42 AM
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#6 |
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Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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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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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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09-28-2001, 08:52 AM
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#7 |
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Oh,you can't buy that new
 
Join Date: Apr 2000
Location: Pennsville,N.J. 08070, USA
Posts: 2,039
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i'm betting 998 or 882 as the last three numbers on your heads!DAVE
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"been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone  73 Pinto, stock, w/CragarSS's-eww  LOTS of Cummins trucks. |
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10-01-2001, 08:07 PM
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#8 |
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Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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Found the block numbers...bet the head numbers are under the valve covers...right?
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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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10-05-2001, 01:20 PM
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#9 |
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Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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Yup.
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