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#1 |
Registered User
Join Date: May 2015
Location: Dover, NH
Posts: 35
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305 V6 Engine Upgrade/Swap
I just bought a 62 GMC 4x4. It has a 305 V6 Engine in it now. Can anyone tell me how complex it will be to swap over to a small block V8?
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#2 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: 305 V6 Engine Upgrade/Swap
Very doable, but I would encourage you to look into the old V6's a little more. Kick butt engines once you get to know them.
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#3 |
Registered User
Join Date: May 2015
Location: Central Massachusetts
Posts: 495
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Re: 305 V6 Engine Upgrade/Swap
I would highly recommend that!! You'll be surprised what those things can do... and they're only original once. Besides, slapping in a 350 is getting to be pretty run-of-the-mill now a days.
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#4 |
Registered User
Join Date: Feb 2016
Location: Mountain Top, PA
Posts: 114
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Re: 305 V6 Engine Upgrade/Swap
Agreed. I'd keep the 305 if it is in good shape! Nice torque for a 4x4. Here is great info on the big block if you haven't seen it already.
http://6066gmcguy.com/ |
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#5 |
Registered User
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: 305 V6 Engine Upgrade/Swap
Totally agreed. SBC's are boring as heck and are nothing special to speak of. A good running 305 V6 will out last any small block and out torque any small block close in size. Tough as heck and will pull anything you can throw behind them. Not the best on fuel....show me a small block that is carbed and IS.....but deliver great torque and power. Bullet proof engines that were over built. A 500 cfm 2 barrel holley and dual exhaust really wakes them up. Not to mention you could always scout a bigger v6 down for more power.
I did a 4 barrel and dual exhaust with mine. Love it. Wouldn't trade it for anything accept a bigger v6. ![]()
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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#6 |
Registered User
![]() Join Date: Jun 2016
Location: Oxford, MS
Posts: 38
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Re: 305 V6 Engine Upgrade/Swap
What manifold did you use for the 4-barrel carb?
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#7 |
Registered User
![]() Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
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Re: 305 V6 Engine Upgrade/Swap
I used a Magnum intake from a 351M. All you have to do is machine the base down and open them up. With a non-magnum intake you'd be cutting into the exhaust cross over and fill welding would be required.
__________________
1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw |
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