Quote:
Originally Posted by special-K
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 got 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.
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I haven't seen Startron in this part of the country. I use Sta-Bil for storing gas in jerry cans. Lasts up to a year, but the ethanol-mix invites water and that sinks to the bottom and causes corrosion of the can's insides. So when I pump it out with a 3/8'' hose on a Holley Blue pump I have recleanable filters inline, before the fuel pump and stop and blow them out, if I see little red [fuel can liner] flakes. I have also used Sea Foam for gas storage, but it takes about half a bottle for one 5 gal jerrycan. Sta-Bil only takes 2 oz/5 gallon, so it's more economical.
As far as a lead substitute, I used to use a generic house product from Checker Auto. Now they're O'Reilly. But it wasn't that much.