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Mark's '73 Pontiac Trans Am

This is a '73 TA I found in a machine shed in '99. It actually belonged to a friend and I didn't know that he owned it. It is an original show car that he bought and started using for everyday transportation. It started to surface rust on the hood underside and a judge at a car show somewhere asked him to not put the car in judging. It was fine for him to bring it to the show but they could not judge it due to the surface rust. So he put it in the machine shed at a friends house and totally dismantled the car.

When he offered it to me he had completely taken out the motor, drive train, rear end, and dropped the front frame stub out the bottom. Because the spoilers and flairs were all moulded in and painted he could not dismantle the sheet metel so that is how I found it. Sitting on make shift saw horses like a model car body, completely intact with no frame and or running gear.

Once I started to reconstruct it I had to build it all back together with the sheet metal all installed. The pics you see are the first days on the street. First car show in 2002. While it was apart I built the motor (see below for specs).


Specs as of 2002
Block:Original but Service Replacement 455 (now 462 cid)
Pistons:Forged TRW SD single trough
Rods:Fully floated, blueprinted, polished, and ARP'd cast rods
Heads:Fully ported 6X-8
Cut and chamber ported to 97cc
Comp ratio:9.1 : 1
Cam:Solid Crower 264/268 degrees @ .050
.552/.558 net lift 108 C/L
Lifters:Cool face solid lifters
Headers:Headman 1-3/4 inch
Intake:Edelbrock Torker II
Carburator:830 Holley
Transmission:TH400
Rear end:10.5" 10 bolt, 3.73
1/4 mile ET:12.0 sec @ 110 MPH
Mods in 2003
Power adder:Cheater nitrous plate system
1/4 mile ET:10.9 sec @ 121 MPH
Mods in 2006
Intake:Wenzler tunnel ram
Carburation:Twin 600 DPs
Twin plates to use the cheater nitrous thru
Water pump:Meziere electric
Other:Removed the heater system
Power steering replaced with an S10 manual gearbox
1/4 mile ET:10.25 @ 133.8 with a 200 shot nitrous (Oct '07)
Mods for 2008
Power adder:77mm turbo w/.96 A/R turbine
5 inch exhaust exit, 4 inch electric dump valve that will
open on request and exit out thru the front passenger
fender. When closed it exits back under the car and out the back.
From the turbo the charge goes thru an air to water
intercooler before going back up to the blow-thru 830 Holley.
Rather docile on the street and with the electric exhaust valv
should sound wild at the drive-in.
Cam:Boost-compatable 248/248 @.050 .520/.520 net solid with a 114 LCL
1/4 mile ET:Should be easily in the 9s.

Related

Night at the track with Marks73TA
Turbo installation on Mark's 73 TA

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