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**special-K** · 07-15-2017, 05:50 AM

In prior years GMC had a 1000 model, but in this series of trucks the GMCs were 1500, 2500, and 3500. The Canadian built GMC models were badged differently. They were 910, 920, and 930.

It sounds to me like, and how I read it, the 402 was an unused original crate engine. Therefore, not set up for no lead fuel. I'd either find a reasonable lead additive or just run it. If it starts smoking upon start-up it's time to do the heads. Or, do the heads now and put it all behind you. I'd just run it.

The ethanol thing is something we all have to deal with. Just run Startron in the pump gas, if it's going to sit a lot. The ethanol is not good for in storage. The idea is sooner used = good/longer it sits = bad. The additive helps. I've been fine in my '72 letting it sit about 4 months in winter with nothing added... but I should use something to be safer.

07-15-2017, 05:50 AM	#46
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: What truck do I have? For the Chevy Gods, Historians and Know it alls In prior years GMC had a 1000 model, but in this series of trucks the GMCs were 1500, 2500, and 3500. The Canadian built GMC models were badged differently. They were 910, 920, and 930. It sounds to me like, and how I read it, the 402 was an unused original crate engine. Therefore, not set up for no lead fuel. I'd either find a reasonable lead additive or just run it. If it starts smoking upon start-up it's time to do the heads. Or, do the heads now and put it all behind you. I'd just run it. The ethanol thing is something we all have to deal with. Just run Startron in the pump gas, if it's going to sit a lot. The ethanol is not good for in storage. The idea is sooner used = good/longer it sits = bad. The additive helps. I've been fine in my '72 letting it sit about 4 months in winter with nothing added... but I should use something to be safer. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 07-16-2017 at 09:29 AM.