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68 GMC V6 Specs

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Mokicker

03-15-2008 17:48:55

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Brother gave me a solid old 68 GMC 1ton with the 305 V6. Needs tuneup and I can't find specs anywhere. Anyone have the point gap, dwell, timeing specs etc?

Think it will make a great tractor puller/hauler.

Appreciate your help.

Carl

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MarkB_MI

03-16-2008 04:13:01

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Re: 68 GMC V6 Specs in reply to Mokicker, 03-15-2008 17:48:55

Motors truck manuals are usually available on eBay.

The V6 Jimmy is a wonderful engine. Gobs of torque. I recall hearing about someone who swapped out a small block Chevy for their V6; they ended up having to swap rear ends as well because the Chevy didn't have the low end torque of the Jimmy.

GMC made several different versions of this engine, including a V-12. These were popular irrigation pump engines for many years, running on natural gas.

One interesting thing about the GMC engine is that it's a 60 degree vee. Almost all V-6 engines today are 90 degree engines with offset cranks.

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mokicker

03-15-2008 18:29:31

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Re: 68 GMC V6 Specs in reply to Mokicker, 03-15-2008 17:48:55

Thanks Gents,

Thought I had a manual for that year; but, can't find that one. You missplace things like that when you're in the military and move every couple years.

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2x4

03-15-2008 18:14:10

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Re: 68 GMC V6 Specs in reply to Mokicker, 03-15-2008 17:48:55

pick up an old Motor Manual for the correct year like Larry is telling ya. They are extremely helpful for lots of specs & repairs. Probably find one on Ebay. I used to have a '61 GMC with v6 305. Its a gas hog & not real powerful but it'll do good for hauling tractors. I hauled cross ties & logs with mine. Nobody collects those motors so parts are plentiful.

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Larry from Maryland

03-15-2008 17:58:21

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Re: 68 GMC V6 Specs in reply to Mokicker, 03-15-2008 17:48:55

Timeing 7 1/2, point gap.019, plugs 45ns,From 1970 truck service book.

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Jon Hagen

03-15-2008 19:32:18

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Re: History of the GMC V6 / V8 / V12 :-) in reply to Larry from Maryland, 03-15-2008 17:58:21

lots of fun reading about history and specs for the GMC V6/ V8 / V12, enjoy. :-)

GMC V6/ V8 / V12

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