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Old 04-03-2021, 09:45 AM   #1
special-K
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Cool GMC Pickup With 478 V6

I thought this was worth sharing. Guy did a nice job on this C2500


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Old 04-03-2021, 11:22 AM   #2
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Re: Cool GMC Pickup With 478 V6

Cool truck! Surprising gas mileage due to a tiny carburetor! Still pulls like a locomotive, though. Are all the V-6s that noisy under the hood?
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Old 04-03-2021, 12:21 PM   #3
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Re: Cool GMC Pickup With 478 V6

Likely get 2 mpg more if he hooked the heater hoses up right!
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Old 04-03-2021, 01:18 PM   #4
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Re: Cool GMC Pickup With 478 V6

The orangesunshine guy must still be asleep...
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Old 04-06-2021, 02:21 AM   #5
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Re: Cool GMC Pickup With 478 V6

Quote:
Originally Posted by 68Gold/white View Post
The orangesunshine guy must still be asleep...
Naw. I had a Union meeting [that I slept thru.]
Nice 478 V6.
YouTube then autoplayed into this Good Ole Boy's V12 GMC Rat Rod on Waylon Wire's Old Iron. 3 of them 702s could run a PT Boat. All one long block, but 4 separate heads. His heads all had the OEM valvecover paint job. Only thing I could think of was, ''Damn. I got a couple pairs of boxer shorts exactly like that!''



But I still like the L25 [292 L6 RPO#].
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Last edited by '68OrangeSunshine; Yesterday at 12:28 AM.
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Old 04-07-2021, 02:19 AM   #6
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Re: Cool GMC Pickup With 478 V6

Cool truck and I found out about another engine. Thanks for posting this.
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Old 04-07-2021, 07:27 AM   #7
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Re: Cool GMC Pickup With 478 V6

Just what cubic inch sizes were there during it's run?
I remember looking up when I heard one coming down the street but I never drove one or wanted one. Seems they put those V6s in everything from pkup to school buses and dump trucks.
It just seems strange they can supply enough air volume to those torque monsters through one little carb.
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Old 04-07-2021, 08:30 AM   #8
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Re: Cool GMC Pickup With 478 V6

Quote:
Are all the V-6s that noisy under the hood?
Smart phones don't do a very good job of recording engine and exhaust sounds. I did a couple recordings that sounded nothing like the actual engine and exhaust. You would have thought all the lifters were bad and the exhaust had leaks!

Quote:
It just seems strange they can supply enough air volume to those torque monsters through one little carb.
The 478 specifications show it made peak torque at 1400 RPM and peak horsepower at 3200 RPM. At those engine speeds, it doesn't consume much air!
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Old 04-07-2021, 12:03 PM   #9
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Re: Cool GMC Pickup With 478 V6

Quote:
Originally Posted by Boog View Post
Just what cubic inch sizes were there during it's run?
I remember looking up when I heard one coming down the street but I never drove one or wanted one. Seems they put those V6s in everything from pkup to school buses and dump trucks.
It just seems strange they can supply enough air volume to those torque monsters through one little carb.
This site should help and give more information than you ever wanted to know about these engines
http://6066gmcguy.com/gmcv6a.html
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Old Yesterday, 05:20 AM   #10
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Re: Cool GMC Pickup With 478 V6

All about high torque at low rpm and long term durability. Now what if GMC had the 401 V6 option ( in addition to the 396-402 V8 ) in a 3/4-1 ton pickup with the 3.54 ratio?
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