<<20th Anniversary Turbo edition, fastest "official" TransAm ever produced>>
I'd like to see a comparison of the 20th Anniversary T/A vs. a 73-74 Super Duty T/A, or a 69 Ram Air IV T/A. Put some modern rubber on either of those cars and I'll take you on in either one.
<<(there were some big block ram air TAs that went out the "back door" of GM that were running low 10s in the early 70s).>>
Nope. All Pontiac V-8 blocks are exactly the same size externally, so there is no such thing as a "big block" Pontiac, not like a big block or small block Chevy or Ford.
Plus, no way an early 70's model Firebird could run 10's with factory parts, even the most exotic parts. They just weren't capable, then or now, of the kind of horsepower you could get out of a Chevy. You can get the parts to get that kind of power from a Pontiac engine now, but not then, at least not in a body that heavy.
An interesting side note: Until the decade of the 90's, the 1965 (poss. '63) Pontiac Catalina with a SD 421 and 4-speed held Car and Driver's fastest recorded 0-60 time at 3.9 seconds.
Think about that. 3.9 seconds on those old-timey, skinny, bias-ply tires. Wonder what one of those is worth now......
<<"I based my statement on info provided by a friend of mine who is an ASE Master tech >>
An absolutely worthless certification. Any Jiffy lube grease monkey could get ASE certified with minimal studying and no experience.
Regarding the GN's and GNX's....I've seen them give both Rustangs and Camaros fits at the dragstrip. The key is to keep the engine as cold as possible, they lose lots of power when hot.
I used to see this one guy at a local track here who had a GN, modified quite a bit, that ran 5.60's in the 1/8 mile. (that's 8.90's in the 1/4). The car was street legal, running on street legal slicks. Awesome. Left the line with the front wheels about a foot in the air.