March 19, 2016

1973 Pontiac 400 Built for HP and Fun!

Years of storage and memories on the road have this 1973 Pontiac Grand Am showing it's age with a moldy and mouse infested interior and worn out smog motor. It pulled into the shop running on 7 cylinders with a plume of blue smoke behind it. This wasn't quite what the owner remembered enjoying about the car when he first got it in the mid 70's.

 It was quickly decided that a complete mechanical overhaul was a necessity. With orders to add a lot more power, enhance handling and freshen the interior, we began tear down on this customer project in the summer of 2015. It's going to be a sleeper, keeping the original look and paint of the classic Pontiac. The Hooker Aerochamber mufflers and new Crager wheels are the only hints at what's hiding under the hood. 


Pontiac_400
BEFORE: 1973 Pontiac 400 smog motor, stock
1973_grand_am_facia
BEFORE: 1973 Pontiac Grand Am: broken front facia



Gross_car_Seat
The seats have seen better days. Mice and mold are eating the upholstery away bit by bit. All new interior is on  the way!


Let the work begin!

Engine is removed and complete mechanical dis-assembly is under way




Pontiac_400_before
Pontiac 400 removed from the Grand Am
Pontiac_400
Disassembly in progress, headed out for machine work

Pontiac_400
The Pontiac 400 is finished with machine work and ready for assembly and paint

Pontiac_400
Pontiac 400 ready for assembly and paint
Pontiac_400_painted
The Pontiac block gets a fresh coat of paint
Aluminum_heads
Assembly of the Pontiac 400 including aluminum heads
Pontiac_400_assembly
Assembly nearing completion

Engine_build
Pontiac 400, fully re-built and ready for dyno testing


Dyno day set up

Tuning and warm up on dyno day at Advanced Engine Concepts
The owner of the car is happy with his results!
See the final "hard pull" on the dyno




Pontiac_dyno_test
The re-built Pontiac 400 now makes 475 HP and 515 ftlbs torque!
Engine_installation
The Pontiac 400 being installed into the re-painted engine bay

Pontiac Grand Am engine and engine bay: BEFORE
73_Pontiac
AFTER: The '73 Grand Am engine bay with fully rebuilt Pontiac 400, A/C, electric fan, headers, Demon carb and many new mechanical features

1973_Pontiac_Grand_am
Repaired front facia, she's ready for the road!




1973_Grand_am
New wheels and interior compliment the updated mechanical work

Grand_am_interior
1973 Grand Am interior, cleaned, new upholstery, new gauges and no more mice!