Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

The dual-coupling units were used in their OEM applications because that was the NHRA class rule for Stock, but I never saw one in a Gas Coupe or Modified Production race car. Those cars would have (if they were not a manual-transmission car) an aftermarket, earlier model "Dual-Range" HydraMatic which only had a single fluid coupling.
There were several companies that sold modified units for street/strip duty and racing; the most popular was built by B & M (whose "Hysro-Stick" was a ruaway hit in the marketplace,) but, there were several others (Bee-Line, Vitar, Quartermaster, C & O Hydro, and a few whose names I can't recall at the moment.)

Though there were a lot of really fast Pontiacs (mostly,) in the "dual-coupling" period of time (1956-1963) virtually all of the HydraMatics in Gassers, Street Roadsters, Altereds and Modified Production race cars were of the earlier, "Dual-Range," single-coupling type.

BTW, "Dual-Range" was a sales gimmick, nothing more. In 1952, They (G,M,) added another position to the shifter indicator; the letter "S", for "Super." Putting the selector in that position simply kept the transmission from up-shifting into 4th (top) gear, making the car more responsive. It could also be used as a braking device at hiway speeds. Big deaL...

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

Freddie has sent me several records sheets (thanks) and that is helping the effort. Trouble is, they are the cryptic "69 Chevy" style so you have to guess at model/engine. I am getting pretty good at it.


But here is one for any gurus:
June 1971
H/S Gary Moore-Carroll's Auto Service-Pierson Pontiac, Tulia, TX
114.06mph, Houma, LA May 71


So I am ASSUMING the car is a Pontiac but they don't even give the year. A 70 GTO 400/350 fits but that is a total guess.
Web search discovered nothing on the car.
Anybody recall?

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

It was a Firebird .

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

Thanks!!
Google just needed that one extra word:


http://www.hotrod.com/cars/featured/...tiac-firebird/


Gary Moore of "Acre Maker" cars:
71 Firebird 455ho/335hp
12.22-114.06 h/s



Ok let me push my luck a little, here is another mystery car:
65 Winternationals
Corky Schroeder
"Pontiac" (no year / model / engine)
14.23 at 98.57 E/SA


Any ideas??

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

Found this entry list for the 1965 Winternationals, but just lists entry as a 1960 Pontiac. Number 760.

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

Here's an 'Acre Maker' '61 Pontiac.

http://georgeklass.net/uploads/3/4/5...135667.jpg?657

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

Gary Moore, Tulia Texas. Great guy, Gary and Ann still race. He had that '61 Ventura when we met them, I was driving a stock one like that (color and all) to work & back at that time.

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

Thanks Terry even that hint helps. Only 2 cars really fit, assuming there was no factoring yet:
60 Cat 9P wagon, 4360/363hp=12.01
or
60 Ventura HT, 3966/333hp=11.90 right on E/SA
So I guessed the Ventura, with prepped engine & trans, down at shipping weight, 1st try in the Gonkulator said
13.91 at 98.72
Closer than usual for a 1st guess!
I just cut down the traction G's a bit, that's all it took for
2.27
9.21 at 78.4
14.21 at 98.58
One of the fun things about re-visiting the vintage NHRA stuff with the Gonkulator is I can see about what 60ft time they must have run to jive with the rest of the combo and et/mph. 2.27 seems slow, but my daily driver cars Gonkulate to more than a 2.40 short time back in the 1970s based on the few vague scribbled timeslips I got back then. Sometimes only the ET was scribbled on the timeslip, not even the MPH! Tires were awful back then.

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

I wonder when NHRA "pulled" the 4-spds out of the '57 Pass Cars...what most of the
owners did...and how much slower was the car with either a 3-spd stick...or the PG?

Re: Lookin for NHRA Stock Class ET/MPH from 1970-71
 

From what I have learned from this thread, the HAMB Junior Stock thread, and Boyce's Junior Stock book, a lot of stuff was legal in 1969 but not in 1970:
* Chev Sedan Deliveries:
* Hydramatic ok in 1969
* Had to run iron PG in 1970
From the data I have, it looks like folks lost a couple tenths at first, but as the 4000-stall converters caught on the difference almost disappeared. The Gonkulator runs I am computing show about the same.


* Chev 57-58
* 4spd ok in 1969
* Had to run 3spd in 1970
* Again, maybe a couple tenths was lost though data is sketchy, I don't have any direct before & after.
* The Gonkulator calculates that most of the loss was in the shifter - the 3-on-the-tree was a LOT slower, but even on the floor, the 1-2 shift is fast on a 4spd but slow on a 3spd (unless you get clever with the shifter as some did).