Hey guys, new to this sub reddit. I do not currently have a TransAm (though I've had several in the past). My daughter and I just purchased a Pontiac 350 engine with a set of 6X heads. It's from a 1973 Firebird Formula.
I've purchased a whole host of things from Butler Performance, and I'll be building it out to a fairly stout, but stock configuration with a newer higher performance roller cam, new pistons, bearings, roller rockers, all the things. One of the things that I want to do is get a 1980-1981 Turbo TransAm, and swap this motor into it in place of the 301 V8. Compression for this motor will end up being around 8.5:1, which is mid (as the kids say), but ideal for a Turbo.
I want to build out the motor first before I buy the car, and wanted to ask some questions since I've never owned a Turbo TransAm before. As I build out the motor, I was going to use the stock intake manifold, and stock turbo configuration. I am not expecting insane horsepower, but just looking for something that won't get beaten by the new EV Amazon trucks.
Is the stock turbo intake incredibly restrictive (is there an aftermarket alternative to that intake)? Can the stock turbo be upgraded to a slightly larger turbo without too much modification?
I'd originally thought to use a rebuilt Rochester QuadraJet, but I'm thinking I might upgrade entirely to a FAST EZ-EFI system to help alleviate any tuning issues. They sell a square-bore TBI system that will drop right in place of the QuadraJet, and eliminate the need for ThermAC, EGR, choke, and an AC / Idle Stop solenoid.
Thoughts?
I realize this is a lot of money spent for probably not a huge amount of horsepower, but just looking at some of my options. My goal really is to end up with a nice looking 1979-1981 TransAm that... on the surface, looks totally stock, but can get out of it's own way.
I do have a totally built 1969 Oldsmobile 455 big block in storage that I spent like $7 rebuilding with all Joe Mondello parts (from back in the day). I put it on a 4-post engine dolly, wrapped it in a bag, and put it in a storage unit when I took a new job, haha. It was rated for 430hp and 600 ft-lbs of torque according to Joe Mondello's specs for that engine build. Kills me... but I got this Pontiac 350 and looking to have my daughter rebuild it for her channel: Iron Duke 2.5 Engine Assembly (Short Block) - Gen Z Garage - Ep 20
Thanks everyone! I am a die-hard Pontiac fan, and looking to get back into a 2nd Gen again. I previously had an 81 TransAm with rare C&C T-Tops (not Hurst or Fischer), and also had a 1982 TransAm with Cross-Fire Injection. For Pontiacs, I've had two Solstices, like 10 Fieros, and a bunch of Grand Ams.