GMC 305 V-6 Big Block????
I picked up my $250.00 Craig's list truck today and it has a 305 GMC V-6 Big Block with a 4spd in it. Before anyone trips I found a website about the engine... I just need to know if anyone knows more or had any personal experience with this engine...
http://www.6066gmcguy.org/gmcv6b.htm |
Re: GMC 305 V-6 Big Block????
it's not a big block... it's just the GMC truck engine V-6.
They run forever love to drink gas like mad parts are not avalible at the corner auto zone Most parts store guys will tell you there is no such thing as a 305 V-6 (tell them it is a '66) More torque than you'll ever need unless you are dragging houses around don't like to rev much at all Neat lookin old monsters that will get you a lotta looks at the cruise in |
Re: GMC 305 V-6 Big Block????
That site is pretty the authority as far as internet info goes on them. I have 2 of them, and I'm a big fan of them. They are very reliable and last forever, and they have tons of low end torque. They aren't a high revving engine and usually geared low, so they aren't the best highway engine in stock form. With higher gears, they do fine.
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Re: GMC 305 V-6 Big Block????
years ago i drove a dump truck that had a 401 v6,Everything LHM said is true.put 21 ton of wet sand on it and go(way overloaded).it would pull down to 500 rpm and just keep chugging.It had two 50 gallon fuel tanks on it and needed them.in the 10 years i was around it the only parts I can remember it needed was a water pump and the carb rebuilt.
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Re: GMC 305 V-6 Big Block????
The website you found has about all the info you will find for them on the internet
Dont twist it over 3400 (I liked to shift mine at 2800) They have dual thermostats & are supposed to maintain no more than 4 degrees difference between cylinders & they last forever, just dont buzz it at high RPM for long & you'll be ok They like big exhaust like a diesel, I had 2-1/4" on mine & I think it was fine for a stock carb, but if you were to put a bigger carb on it & take it apart & have it balanced & find a way to put a harmonic balancer on it so you could twist it higher, I think 3" would be better Over Drive trans & some different gears in the rear to keep the RPM low would be a great addition... A NV-4500 would be what i would put behind it And my truck got rather decent mileage, Unlike what Andy said... But I drove mine slow & it was a 1/2T 3-speed |
Re: GMC 305 V-6 Big Block????
i have a '68 gmc 3/4ton with one in it. 4 speed, dana 60 rear. i use it around my place hauling and moving stuff. it's not street legal but it makes some cruises on the old black top country roads behind my house. not real fast but it pulls good. as mentioned above,parts aren't at every parts store but can still be found with a little seaching. i bought a carb. kit, valve cover gaskets and a fuel pump for mine.
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Re: GMC 305 V-6 Big Block????
Thanks for the good education!!! Keep the info coming... I am at a point where I have to decided to clean it up or go in another direction... I think for now I am going to clean it up and see how well it does... The thing runs like a sewing machine...
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Re: GMC 305 V-6 Big Block????
Wow, I didnt know GMC made V-12s...... Thats some good info...:alky:
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Re: GMC 305 V-6 Big Block????
They are truly unique and are quite a conversation piece. I have the 351 Magnum version in my dump truck, and it is a Beast!!! I also have a 401 Magnum out of a 2 1/2 truck that I hope to use in a pickup someday.
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Re: GMC 305 V-6 Big Block????
In original use, the engines did not have the "zoomie" headers. There were cast iron manifolds with mufflers. They were still pretty loud, though. I think GMC also made these to be used in tanks in the late 40's / early 50's as well.
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WIDESIDE 72, those pics are great. |
Re: GMC 305 V-6 Big Block????
Met a guy years ago who had a business.His clients(old Farmers) used the V-12's for irrigation like above.His business was to tune/maintain those pumps and engines.He claimed most needed points,condenser,plugs and an oil change a couple times a year.He also kept a couple rebuilt for replacements.
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Re: GMC 305 V-6 Big Block????
cool engine --- i'd clean it up and roll with it
fits right in with the current "dare to be different, newstalgia" vibe thats floating around the auto scene now (a vibe that i like -- bring on the 6's, W motors and other asorted niceties) |
Re: GMC 305 V-6 Big Block????
The V6 was designed for rugged low rpm torque and long life. They ranged from the 305 in pickups to the 478 in larger trucks.
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Re: GMC 305 V-6 Big Block????
I don't know about the term "big block"...but it appears to me a 305 V6 (and 351, 401, etc) is "physically" bigger then a say a 305 or even 350 sbc V8.
it's no hot rod motor...but a great, low rpm, long lasting, torquey, "truck motor". dang thirsty though compared to a I6. |
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thanks a lot !!! :metal: |
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http://www.6066gmcguy.org/V6pwr/B-702-a.jpg http://www.6066gmcguy.org/V6pwr/B-702-c.jpg http://www.6066gmcguy.org/V6pwr/B-702-d.jpg This a GMC V12 Powered IH TD-18 http://www.6066gmcguy.org/V6pwr/V-12-KoO-01.jpg http://www.6066gmcguy.org/V6pwr/V-12-KoO-02.jpg Lastly, here's a few V12's running. |
Re: GMC 305 V-6 Big Block????
wonder if i could wedge one of those v12s into my gmc???>>
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