1978 GMC C15 Twin Turbo LS

1978 Chevrolet C-10 Description

1978 GMC C-15 Grand Sierra
Twin Turbo 5.3 LS

LINK to video.

https://youtu.be/dFzcmShgrsI

-NHRA 8.50 cert cage. 1 & 5/8 mild steel. Has door bars but you can’t swing them out you have to just unbolt and take out. I take them out for street driving.

-Truck has been 9.706 at 139.69mph. Non-intercooled with E-85 on a 1.543 60ft leaving off of 5lbs at 3800rpm and it has been 1.4s to the 60, the suspension just needs dialed better.That was before the upgrade to 160 injectors and 2nd fuel pump because last year I ran out of pump.

-Truck weighed 3950 with me and a full 15-gallon fuel cell. But has since had some weight reduction done and haven’t reweighed.

-Super clean truck but does have a few scratches and paint imperfections, it was repainted in 1982. I replaced the floors and cab supports when I built it. Dash has some cracks and door panels have some wear and have been notched for door bars. I street drive it a lot and it does very well.

Clean Indiana title.

Street legal truck (has horn, turn signals, high and low beam headlights, Etc.)
Runs on pump E-85.

----------Engine---------------
-GEN 4 SBE 5.3 (engine was rebuilt over winter with new main and connecting rod bearings and ring gap set)
-BTR stage 2 twin turbo cam
-TBSS intake and throttle body
-Stock 799 heads.
-BTR Trunnion upgrade
-Chevrolet performance high volume oil pump
-BTR chromoly pushrods
-BTR spring
-BTR LS9 multilayer headgasket
-LS7 lifters
-ATI balancer
-ARP Head studs
-Holley 160lb injectors
-Holley fuel rails
-Holley fuel pressure regulator
-(2) Holley 12-1800 Dominator fuel pumps with pre and post filter.
-2 Borg warner S366 366/68/88/T4
-Stock truck manifolds flipped and with v-bands to stainless to turbos and were just cerakoated.
-TIAL 38mm wastegates
-TIAL BOV

-HOLLEY DOMINATOR ECU with single boost control solenoid and aux input and output harnesses
-HOLLEY 7inch touch screen dash, GPS speed harness, and fuel level gauge I/O harness.
Has hall sensors monitoring front and rear wheel speed to act as “torque management”

-Drive by wire

-F body radiator and fans

----------Transmission---------------

-RPM built TH400 with probrake and reverse manual valve body, SFI bellhousing

-PTC 9.5 converter

-Local driveshaft shop built the driveshaft and guaranteed it to 1500hp.

-JEGS trans cooler with fan

-JEGS SFI flexplate

-----------Rear-end--------------

-QTP 9 inch. thick wall and back brace

-35 spline Moser axles with 3.50 gear and spool

-QTP rear brakes

-1350 yoke

--------Front Suspension---------------

-CPP 3-inch drop springs

-McCaughey’s suspension 5x4.75 front conversion with drilled rotors and 2.5 drop spindles

-Comp engineering adjustable shocks

-Stock control arms rebuilt with poly bushings

-Stock crossmember

-------Rear Suspension--------------

-Calvert split mono and Caltracs

-QA1 double adjustable shocks

-1-inch lift shackles

------------MISC------------------

-Kirkey 17 wide seats

-Jegs 5-point harness

-Kilduff machine lightning rod shifter

-RBZ billet steering wheel with transbrake and bump buttons

-Champion rear beadlock wheels black stripsters with Mickey ET street radial pros. 275/60-15

-Jegs SSR spike front wheels with 28-inch mickey thompsons

-Wheels were powder coated.

-New windshield

-15-gallon Jegs fuel cell with GM fuel level sending unit

-1.032 master cylinder

-Jegs line lock that is wired to only work when bumping on transbrake to not make it so violent.

-Ultraflo 6” SS round mufflers

-Gutted front core support and dimple died

-Custom made front bumper

-LED light bars behind grille for headlights with low/high beams

-Windshield wipers work and horn also.

-Has power steering

-No radio or heat/ac

-------THE BAD------------

-Driver side cab corner had some rust issues that looks like previous owners fixed and that weren’t discovered by me until after truck was reassembled and has some missing metal. That’s the only rust issue and it’s really hard to even notice when the truck is on the ground. Its been sprayed with rust encapsulator.

-original Carpet isn’t the best fitting and has factory holes where bench seat bolts were.

-door panels being notched look a little odd when no door bars are in and are a little worn.