1970 Double Blown GTO

Filed in Pontiac GTO by on January 23, 2016 • views: 798;


Photos of this car pop up everywhere on the internet. A diligent search found articles that had been done on the car, but we lucked out and found the owners forum profile on pontiaczone.com. We decided to go with the owners own words to describe this car:

Year: 1970
Make: Pontiac
Model: GTO Judge Pro Street

I bought this car in 2003 off Ebay from a guy named Jim Seibert in Illinois. It had been sitting in a barn for a while. Those years took their toll. When I bought it, it had a blown injected 406 Pontiac in it and the rest was suffering from sitting. In the course of the next two years, I basically replaced almost everything in and on the car. I replaced the 406 with a much stouter 474 and got rid of the injection in favor of the tried and true dual Holley carb induction. I replaced the Turbo375 trans with a Turbo400 and then replaced the Ford 9″ 4.56 third member with a 4.11. I also replaced the entire cooling system, brake system, electrical system, fuel system, interior, trunk, floors, trans tunnel, firewall, front suspension, rear suspension, steering column, dash, wheels and tires, and exhaust.

The only thing I didn’t replace in the first two years was the full cage, body and paint. Well, in August of 2005 I was on the way to the Pontiac Nationals in Norwalk Ohio with my family and we had an accident that caused the trailer to flip with the car in it. We went on to Norwalk with the car on my open trailer anyway and when we got home, it was apparent that the body and paint was next on the list. After finding some help for the repairs, it was underway. While the body and paint were being done, I was planning another way to stand out from the crowd. I decided to try and stack two blowers on top of the 474 and see if that would work. It did and when the combination of the new paint w/ the double blowers came together, you couldn’t pry the smile off my face. I didn’t have the money to be the fastest or the prettiest, but I did something different and it now stands out in a crowd.


Chassis: 2×3 box w/ chrome moly cage
Front Suspension: rack & pinion w/ coilovers
Rear Suspension: ladder bar w/ coilovers
Rear Axle: Ford 9″ w/4.11’s
Brakes: Disc front/ drum rear
Wheels & Tires: MT ET Streets 18X33.5 on 15X14 Weld Pro Stars on rear/ 15X4 Weld Pro stars on front

Paint Color: PPG Orange Glow over a silver base

Seats: Porsche 944
Upholstery: Tan Leather Allante
Carpet: Custom Tan
Dash: Custom
Gauges: Autometer Pro Comp
Shifter: Hurst Lightning Rods

Engine: Pontiac 474 w/871 Blower on top of a 671 Blower
Camshaft: .609/.609 268/276 @ .050 114CL
Cylinder Heads: 6H ported
Valvetrain: Roller
Induction: 871 Blower on top and 6-71 Blower on bottom w/ twin Holley 750’s and SuperChiller intercooler
Exhaust: 3-1/2″ all the way out w/ GTO tips
Transmission: Turbo 400
Cooling: Custom Griffin aluminum radiator w/ twin fans

Videos & Photos:

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