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Old 07-28-2010, 01:59 PM   #1
68GMCCustom
Truck and auto performance nut
 
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Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
Project -underfunded - '68 shortstep/carb'd LSx/200-4r build

I'm finally to the "mostly clean" part of my build. I am doing a frame up on my '68 GMC custom. Cosmetically it looks like a Chevy with a '68 Chevy grill, though my plans are for no markings on the truck.

I will be installing a genIV '09 LY6 6.0L crate motor (using the ECE kit) with a 200-4r trans backing it up. The LY6 is an iron block 6.0L with VVT (variable valve timing) and the high flowing L92/LS3 style rectangular intake port heads. This 6.0L will not be efi...it will have a Holley Street HP 750 carb sitting atop a GMPP LSX/LS3 dual plane intake with an MSD 6LS-2 to read the sensors and fire off the factory coil packs. Comp has recommended a .224/.228 @ .050 and .566/.568 lift on 112 LSA tho I've been thinking bigger. The 200-4r is built to handle 500+hp and has a 2500rpm stall convertor.

*edit - cam went bigger! see attached:


I also have the CPP (Western) 2.5" drop spindles, tubular upper control arms, 1"/4" drop springs, drop shocks, adj. panhard, and front and rear sway bars to upgrade the suspension. I also am wanting to add rack and pinion steering, bigger brakes and rear discs, and a vintage air. As for the body...other then the addition of a cowl induction hood...the paint and body work will have to wait for me to pay off the powertrain/chassis build.

The perfectly good running and looking truck I started (after setting the body on a '72 chassis a few years ago) with:







...still can't believe I tore it apart!



and now..........
the chassis:









the motor:




and trans:


....more to come later
Attached Images
 
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Kurt -

'68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
'72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close
'06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD
'18 Kia Sorento - wife's econo-driver
'95 Chevy S10 - reg cab shortbed, LS, 4.3, auto...

my '68's powertrain and chassis build -links broken
A surprise phase - carb to efi -links broken

Last edited by VA72C10; 03-07-2012 at 02:37 PM.
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