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09-10-2007, 10:45 PM | #1 |
One of the few GMC'ers
Join Date: Jul 2005
Location: Des Moines, Iowa sometimes Butler, PA
Posts: 146
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converting to hei...87'
so i got a newsed engien from my local junk yard been told its from a 90' anyways has center bolt valve covers and all its sposed to but the guy bfore me put a 2 barrel intake and carb on it with a HEI distributer. now ive been led to believe that the coil in cap heis are better then what came in my 87'. now after i put my old throttle boddie intake on i put the hei dist in but the vac. advance on it gets in the way of EGR and water line on the manifold. what am i doing wrong here i am putting dist. in the same ways it came out and all i dunno what should i do
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87' Silverado 4x4 "Young, Dumb And Full Of Cum" |
09-11-2007, 07:46 AM | #2 |
Registered User
Join Date: Dec 2006
Location: Central Maine
Posts: 210
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Re: converting to hei...87'
Your '87 should have already been equipped with a "coil in cap" HEI unit. As far as I know, there hadn't been any significant design changes in these distributors since the 70's. That being said, I guess I'd use the old one if the fit is better.
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09-11-2007, 08:09 AM | #3 |
Registered User
Join Date: Dec 2004
Location: Readsboro, VT
Posts: 502
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Re: converting to hei...87'
I've used both style HEIs and never found one to be any better than the other. I converted my IROC to a small-cap distributer with no problems whatsoever. But, there's no reason not to use the large-cap style if that's your preference either. Just make sure that you use the appropriate gear for the distributer. Whether your new motor has a roller cam or not will determine whether you use a bronze gear or a regular steel one.
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09-11-2007, 08:24 AM | #4 |
The Crazy Machanic
Join Date: Jan 2007
Location: Nokesville Va
Posts: 1,437
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Re: converting to hei...87'
id say use the one that stock from your truck it should be like the one from my 89 that had tbi. using it and your stock intake is it was before wont hart the engine unless like jim said it had a rollers or not ur engine the factory one was not the 90 i dont know, it might have been a vortec engine and i think those did have rollers.
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*1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) * 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one |
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