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04-11-2010, 09:17 PM
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#1 |
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Registered User
Join Date: Nov 2005
Location: Paducah, Ky
Posts: 393
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HEI convert c-60
Here's one thats a little out there. I have a 75 C-60 that I'm trying to convert to HEI (it's a Grain Truck). It has the stock 2 bbl, with a ?governor? on the passenger's side. It had a hose going to a tee on the back side of the distributor. Anyway, I removed the old points style distributor, the real tall ones like came in 2-ton trucks, and dropped in the HEI, ran a power wire from the ign circuit in the fusebox, and she hit like a champ. Idle is near perfect, so I put the timing light on it and tweaked it where I wanted it, and connected the vacuum advance line to the governor. Still ran fine until you touch the gas pedal, and it dies immediately. Remove the vacuum line, and all is well. Any ideas where I should get vacuum for the new HEI, or what I need to do with the line from the governor? I'm at a loss over this one.
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04-12-2010, 08:41 AM
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#2 |
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Registered User
Join Date: Nov 2005
Location: Paducah, Ky
Posts: 393
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Re: HEI convert c-60
Surely someone has worked on one of these?
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04-12-2010, 09:09 AM
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#3 |
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Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: HEI convert c-60
Have you tried to pick up the vacuum off of the intake manifold? It would not be ported vacuum, but it would let you know if something else is wrong.
The Hei in my '77 6500 GMC with 427 does not have vacuum advance. Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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04-12-2010, 09:26 AM
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#4 |
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Registered User
Join Date: Oct 2008
Location: Brighton, TN
Posts: 1,267
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Re: HEI convert c-60
You dont necessarily have to run the vacuum advance. You can bump your timing up a few degrees and compensate for it. Wont hurt a thing.
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A computer once beat me at chess, but it was no match for me at kick boxing. Duct tape is like the force. It has a light side, a dark side, and it holds the world together. |
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04-12-2010, 11:31 AM
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#5 |
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Registered User
Join Date: Mar 2010
Location: lakeside california
Posts: 44
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Re: HEI convert c-60
You may have a bad wire in the HEI that's giving you trouble when the vacuum advance pulls on the magnetic pick up.
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04-12-2010, 05:11 PM
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#6 |
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Registered User
Join Date: Nov 2005
Location: Paducah, Ky
Posts: 393
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Re: HEI convert c-60
Thanks for all the help. I think the problem is with the governor, not the new HEI. Does it need to be connected to vacuum, or atmosphere?
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04-12-2010, 07:04 PM
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#7 |
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Watch out for your cornhole !
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: HEI convert c-60
I agree with srr. I'd look for a broken wire inside the HEI. When the advance pulls the mechanism, the wire separates.
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