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Old 10-21-2018, 11:06 AM   #42
68 P.O.S.
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Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
Re: 1970 c10 distributor upgrade recommendations

Not quite. I advocate pulling a stock GM HEI distributor from the junkyard (especially since its CHEAP), but not just stabbing it in there. It needs to be setup correctly first before installng it. GM used a wide variety of internals in the smog area so you never know what you're gonna find. So if you go the junkyard route, you're probably gonna need a new cap & rotor at least, and need to get the #375 centerplate and #41 weights to give you 22 degrees mechanical advance. You'll have to scour junkyard distributors to find these. Or rob them from an aftermarket distributor since they use this combo of weights and centerplate as well. You'll also need an adjustable vacuum advance because a lot of those GM units provide way too many degrees of vac advance. Buy the Crane 99600-1 vac advance kit, it comes with an adjustable vac can, a travel limiter, and 3 sets of advance springs. Install 1 blue/1 silver spring so the advance will be all in at 2800 rpm, limit vac can to 10-15 degrees advance, and adjust vac can to 2-4 turns out from bottomed out for your vacuum level. Or you could save yourself the time and talk to this guy: https://www.davessmallbodyheis.com. He's the HEI master and will make a custom curved dist for you doing all the stuff I mentioned and more.
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72 C10 lwb fleetside -stock 350/350 combo
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