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Author Topic: '74 K20, 454 swap, 2nd owner, South Texas  (Read 6696 times)

Offline rumblebox

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'74 K20, 454 swap, 2nd owner, South Texas
« on: October 11, 2015, 11:17:25 AM »
'74 K20, SM465, 454 swap, NP208 swap, 14-bolt FF, D44

My uncle bought it brand new but hadn't used it very often in recent years. I've wanted it for a while and finally asked if he would sell it to me. Well, he ended up giving it to me about 7 months ago. So far, all I've done is clean it up, install better tires, and do a few small repairs.

I've been an LSX guy for the past 15 years, and this is my first adventure into old-school carb territory.

He installed the 454 and NP208 sometime in the 80's, but the 454 has developed a heck of a rod knock. It does have 781 heads, so I'm going to work those over a bit and put them on the new engine.

Performance plans:
- massaged 781 heads with big valves
- domes
- air gap
- 850 double-pumper with annular boosters
- solid flat cam with modern firing order swap
- 1.75" headers (i know)
- mandrel-bent 3" with bullets and magnaflows out the back (I hate the sound of side-exit duals)
- NV4500 swap

As far as cosmetics are concerned, I'm putting a patina preserver over the paint, installing a factory rear bumper, and restoring the interior. I'm not a fan of modern wheels on classic 4x4's.... They just look completely bro'ish to me.(Street trucks are a different story) So I'm repainting the steelies and trying to find some 69-style hubcaps that don't cost a fortune.
« Last Edit: November 09, 2018, 12:44:23 PM by rumblebox »
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74 K20, 468, Sniper EFI, SM465
90 Suburban, beater
66 GTO
07 Denali
11 335d

Offline Irish_Alley

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #1 on: October 11, 2015, 11:18:57 AM »
welcome from maryland
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Offline rumblebox

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #2 on: October 11, 2015, 11:44:05 AM »
6.0, LS3 heads, cam, stall, full suspension, etc, etc.
I had a 99 formula that got creamed in a parking lot. So i found a V6 car with a blown engine for cheap that was in way better condition anyway to convert everything from the old car.

][/URL]

I sold the formula to buy this:
07 Victory Hammer, Lloydz intake, Bassani exhaust, Dobeck auto-tuner
« Last Edit: October 11, 2015, 11:49:58 AM by rumblebox »
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74 K20, 468, Sniper EFI, SM465
90 Suburban, beater
66 GTO
07 Denali
11 335d

Offline AZ87V10

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #3 on: October 11, 2015, 12:43:28 PM »
Welcome from Northeast AZ!
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1987 Chevy V-10 Silverado short bed, 350TBI, 700R4, NP208, 3.73's, 31's
2001 Dodge Ram 1500 Laramie Quad Cab 4x4 short bed, 5.9L V8, Auto, 5 inch lift, 35's, 4.56's

Offline Captkaos

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #4 on: October 11, 2015, 01:29:11 PM »
Welcome to the site!
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Offline LTZ C20

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #5 on: October 11, 2015, 05:21:03 PM »
Welcome from central California.
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LTZ Cheyenne C20

Offline VileZambonie

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #6 on: October 11, 2015, 06:44:02 PM »
Nice!
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Militiaman55

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #7 on: October 11, 2015, 09:25:24 PM »
Welcome, LOVE the 74!
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Offline Joec123able

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #8 on: November 12, 2015, 10:08:55 PM »
Gorgeous truck!!! Love it just the way it sits
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Offline Jason S

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #9 on: November 12, 2015, 10:15:17 PM »
Wow! 

Missed the '74 when originally posted... Very nice. 
I'd love to see more photos.
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1973 GMC K2500, Super Custom, Camper Special, 350, TH350, NP203, 4.10's
1974 Chevrolet K10, Custom Deluxe, 350, SM465, NP203, 3.73's

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Offline zieg85

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #10 on: November 13, 2015, 06:25:50 AM »
Welcome from west central IL
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline Tazman

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #11 on: November 22, 2015, 02:12:53 PM »
Welcome from AZ.
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Offline TheChev

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #12 on: November 30, 2015, 05:52:24 PM »
I like it! Really similar to my '74 except for the color and mine has a 350. Pretty nice to find these trucks with original paint, that should buff out nice like mine did
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Offline Jim_Hensley

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Re: '74 K20, 454 swap, 2nd owner, South Texas
« Reply #13 on: January 09, 2016, 06:16:58 AM »
Welcome from Temple,Tx. Nice truck.
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