[threefidee]

Just got my August issue and Mark's '71 455 HO Trans Am is featured in the shootout. She runs good.

Jody

[Judge273]

I can't read the exact time...is that a 12.4 something? Scott Tiemann got that thing moving!

[Father&Son73T/A]

Originally Posted by Judge273

I can't read the exact time...is that a 12.4 something? Scott Tiemann got that thing moving!

Yeah,a stock 71 TA pullin 12's on street tires?
That's nuts.

[Lloyd-TX]

Originally Posted by Judge273

I can't read the exact time...is that a 12.4 something? Scott Tiemann got that thing moving!

Yep - best pass (corrected) was a 12.40 @ 112.44.

Dan J., Mark W. and Scott T. certainly know what it takes to make a pure stocker HO run!

[70RAlll]

Originally Posted by Lloyd-TX

Yep - best pass (corrected) was a 12.40 @ 112.44.

Dan J., Mark W. and Scott T. certainly know what it takes to make a pure stocker HO run!

Please do not take this the wrong way guys...I ,myself , own a 71 HO.. But I question a STOCK 71 HO running low 12's?? I haven't finished my car yet, so i can not say for sure. But I was unaware that a 1971 TA ever ran low 12's in stock form. Am I missing something here??I thought these were low to mid 13's cars in stock form. I know I have test numbers somewhere here, just too lazy to find it. But with internal modifications, which would be undetectable, I am sure a 71 can run low 12's. But just don't get it with a stock car, even if you upped the compression to just under 10. I think you would have to stoke the engine to over 500 cubes and change to cam to get low 12's . Someone help me with the correct numbers without trashing me. I will state it again, I am not stating emphatically that it is impossible, just was unaware that they ran this fast in stock form..

[rustedgoat]

Its not stock is in how it rolled out of GM but "pure stock" is a racing class in which alot of the rules require you to use mostly original parts with correct castings #'s, no porting, no headers and I think no suspension mods. Kind of like racing correctly restored muscle cars. These guys know how to blueprint, build and fine tune these engines and get the power to the ground very efficently. Very, very cool to watch them race

[Jim Rotella]

Originally Posted by 70RAlll

Please do not take this the wrong way guys...I ,myself , own a 71 HO.. But I question a STOCK 71 HO running low 12's?? I haven't finished my car yet, so i can not say for sure. But I was unaware that a 1971 TA ever ran low 12's in stock form. Am I missing something here??I thought these were low to mid 13's cars in stock form. I know I have test numbers somewhere here, just too lazy to find it. But with internal modifications, which would be undetectable, I am sure a 71 can run low 12's. But just don't get it with a stock car, even if you upped the compression to just under 10. I think you would have to stoke the engine to over 500 cubes and change to cam to get low 12's . Someone help me with the correct numbers without trashing me. I will state it again, I am not stating emphatically that it is impossible, just was unaware that they ran this fast in stock form..

These Pure Stock cars are not bone showroom stock. They are allowed some minor modifications, but nothing really radical. If you look at the article closely, you'll see that Mark's bottom end was balanced, the compression ratio was increased to 9.63:1, the carb was rejetted, the distributor was recurved, and the exhaust was upgraded with a 2.5" mandrel bent Pypes system and an X pipe. These engines really respond to those legal PS tweaks. Just look at Paul Glasco's '70 Knafel Magnum 400 clone in that same article. With similiar modifications, it ran a corrected best time of 12.29 at 112.80. There are several Ram Air IV and SD455 cars running mid-to-high 12 seconds in these PS races. It's really amazing what they are doing with these cars.

[rustedgoat]

I'd like to know what kind of times these guys involved in pure stock could run if they had no rules but still look stock, run pump gas, and be street friendly. You know what alot of us restoring are cars are trying to do. Porting and streetable cams allowed but factory intake and exhaust a must. Something along the lines of a F.A.S.T. car but again streetable.

[70RAlll]

Originally Posted by Jim Rotella

These Pure Stock cars are not bone showroom stock. They are allowed some minor modifications, but nothing really radical. If you look at the article closely, you'll see that Mark's bottom end was balanced, the compression ratio was increased to 9.63:1, the carb was rejetted, the distributor was recurved, and the exhaust was upgraded with a 2.5" mandrel bent Pypes system and an X pipe. These engines really respond to those legal PS tweaks. Just look at Paul Glasco's '70 Knafel Magnum 400 clone in that same article. With similiar modifications, it ran a corrected best time of 12.29 at 112.80. There are several Ram Air IV and SD455 cars running mid-to-high 12 seconds in these PS races. It's really amazing what they are doing with these cars.

Guys, I am sure everyone will start screaming at me. But I am sceptical at heart. A 71 HO engine just doesn't run low 12's in stock form with re jetting and distributor re curving. These cars never were Quarter mile cars. Pontiac 455's torque/HP curves fall like a rock past 4500 RPM.They were always red light to red light monsters,still are!! But the stock valve train just doesn't suite high rpm full throttle service.Have any of you guys ever gone over 100mph in one of these cars with a 3.73 rear?? something like 4500 rom or more,brutal. I would be a believer if they did a random tear down ,or at least removal of valve covers after a race. It is so easy to hide internal modifications now a days. And like I said, these engines weren't designed to run the high RPM"s that a 12.40 QM would indicate.Ask any engine builder,like the guys at Butler, if they think a stock(which essentially that what this engine is-minus a dist. and carb tune) 71 455 could run a TA into the low 12's.They own their local track and I know without a doubt their answer is yes with internal modifications to the heads and valve train, but no using stock heads with stock ,non adjustable valve train.And guys ..think about this. The technology of rejetting a Quadrajet and re curving a distributor have been around since these cars were new. I don't even thinkthe 70 hemi 'cuda's ran low 12's in near stock form.They were the absolute King of the QM in their day. If TA's in stock form could do this, we would have seen articles proclaiming these cars the new king of the track.
And guys, I am sure I will get a bunch of trash talk back at me for suggesting this. But I just don't get it. I am not super expert engine builder, but I do build all of my own engines here at my shop ,by myself. SO I know a bit about the chacteristics of these engines. Granted I have NEVER ran a QM in one of these, so I could be dead wrong here. Just doesn't make sense to me that simple jetting and re curving could slice almost a full second off generally accepted stock times. Heck the Motion Camaros were only guaranteed to run 13's...we are supposed to believe that near stock TA's are running 12.40's without internal modifications?? I am still skptical.. Please someone help me see what I am missing. I am not too much of a smarta$$ that I can not accept when I am wrong.To the contrary...I would love for someone to show me where i am wrong.

[njsteve]

Not nickpicking here but the Motion Camaros were gauranteed to run an 11 second quarter mile with one of their drivers behind the wheel or you got your money back, NOT 13 seconds.