This Protofab TA / GT1 car was built by the Duntov Motorsport team in 1981 to the then current Trans-Am rules. Eppie Wietzes had just won the Trans Am title in a similar car. The car was initially bodied as a 1982 Corvette and won every race it finished until the 1983 SCCA Runoffs where it finished 3rd, but first in class! By then fully tube framed cars were legal in Trans Am and GT1. In 1986 it was rebodied as a C4 Corvette and placed 7th in the Dallas Trans Am in 1988, but again first among Corvettes. Following the 1988 season, Gary Pratt (currently of Pratt and Miller) with Protofab Engineering sent the team a spare body from their successful 1988 IMSA campaign. The car first ran with the Protofab body in December 1993 when it lapped the field at the last SCCA race of the season at Texas World Speedway. Its last race was in October 2004 at TexasMotor Speedway where it retired with a broken differential while leading.
The car was purchased from Alan Sevadjian by my father Bruce Thomas ,in around 2009, It was shipped to Australia to be campaigned in vintage racing, it was tested at Winton raceway at a VHRA event, but was deemed to not fit into an Australian vintage racing class, apart from an unrestricted class. Bruce decided to send it back to Texas to be sold.
In 2016 Duntov put the car through a total frame up restoration, including engine, transmission, differential, brakes ect. Everything. The body was taken down to its fiberglass and carbon fiber primer, repaired and repainted. Its first test session was at COTA in November 2016 where it showed potential but was not yet ready to race.
This was the cars last race outing, since then it has been in storage, with the engine stripped to fit new custom pistons to suit the modified heads. I Inherited the car from my father in 2022 and have fully rebuilt the engine, reassembled the car ,new fluids throughout ,fired it and cleaned everything.
The car is offered with zero or break in hours only on engine ,trans and differential, ready for SVRA group 10 or SCCA GT-1 class.
SPECIFICATIONS
ProtoFab IMSA type C4 body panels.
All panels are removable by Dzus fasteners, and it has a comprehensive tube structure Rollcage front to back.
Chassis was originally a GM supplied replacement C3. No chassis number.
Corvette uprights at the front, custom tubular A arms, and heim joints. Composite transverse leaf spring, rack and pinion steering.
Rear end is corvette centre section with external oil pump, filter and ducted radiator. Oversize half shafts and U joints, and custom built hub carriers.Custom long outboard pivot arms run through the chassis Kickup to forward mounts
Rear is sprung with corvette transverse composite leaf.QA-1 adjustable shocks.
Gearbox is a Saenz 910 Five speed Dog Ring racing transmission, freshly rebuilt with all new bearings throughout. External electric oil pump, filter and ducted radiator at rear.
Clutch and flywheel is triple plate Tilton ST 246, new friction discs just fitted.
Brakes are Alcon four piston Alloy with radial vented 13” Rotors. Driver adjustable front/rear bias. Ducted cooling from front Spoiler to internal diameter of rotor.
Wheels are Jongbloed Magnesium centre three piece, 16x12 F 16X13 R. Goodyear sportscar special racing slicks.
Engine Originally Built by Rehr-Morrison racing Engines.
Chevrolet “bowtie” racing iron block, 4 Bolt Splayed main caps.
366 Cubic Inches.
Bryant racing 3.6” stroke Steel Crank, Childs and Albert rods ,Carillo custom pistons with custom narrow, sealed power radial ported rings.
Aluminium chevrolet bowtie 18degree high port heads with extensive porting and exhaust port riser plates.
Erson billet roller solid Cam E11099 custom grind.(specs on request).Bronze lifter bushings. Jesel shaft mount roller rockers.
Chevrolet 10185053 Intake ported and matched
New Brasswell custom built 750 cfm 4150 style four corner idle double pumper racing carb.
Engine just rebuilt with all new bearings and seals throughout, honed to fit new piston set, all clearances set and recorded.1/2 hr run time only on Engine.
According to Alan the engine made 725 HP at 8000 RPM.
Dry sump lubrication with oil cooler, filter, three stage radial pump and 5 Gallon tank at rear of car.
Ignition is tach drive Accel distributor, advance Locked. Accel CD ignition box, complete redundant driver switchable ignition system installed. New Optima sealed gel Battery.
Halon fire extinguisher with hard line plumbing to fuel tank area, cockpit and engine bay.
Static Compression ratio 13.4 :1. 112 octane race fuel required.
Bladder fuel cell, foam filled. Dry break quick fill fuel Inlet.Two redundant fuel pumps on separate switches.
Supplied with set of tall, narrow transport wheels, a large number of Saenz gear sets to suit, and header-back muffler system for noise restricted tracks.
Enquiries to Ben Thomas 512-426-8077. [email protected]
Car located in Johnson City, Texas. Viewing anytim