Pure stock 340 Mopar

[mike coates]

Terry
I do run the 727, but have a manual valve body. When I was putting it together, there was a debate on this and I believe Dwayne said it was OK.
there was also a debate on the transmissions and at the time, it was worked out that if you ran a 904 (or any non original trans in other brands) you had to use the current HP rating, but if you ran the original (727, etc) you would get a 10 hp reduction for carbs (5 for FI cars).
Like I said earlier, I haven't raced for awhile so I don't know if anyone still uses this, but it was never made official and I still use the rated hp because of that. So I am at a disadvantage due to that....plus my valves are stock with no back cut...probably why I only run .1 to .2 under, among other things...
Mike

[Ross Family Racing]

Todd,
I ran my '72 Cuda in Pure Stock for several years.I set a couple of records early on and went through teardown with the old stocker style cam.(I actually had an old cam I bought and used from Ed Hamburger back in the early 80's).
The 904 was run in my car after a call to Mike Baker at IHRA.I asked if the 904 could be used in place of the 727.He asked me if it was the same number of forward gears(to which I answered yes) and he told me it was fine to run that transmission.
At Norwalk in 2005 when I qualified #1 in Stock is when some turds hit the fan. It was then decided to let the cars with the stock trans have a 10HP deduction. We were several times checked to see if we had the mechanical fuel pumps,as were others. The rear tire size is limited to 29.5 and when Mickey Thompson came out with the 29.5 radil slick we used that.Truman Fields actually ran the 29.5 Mickey radial before anyone else because he was testing the tire for M/T.We could not yet purchase that tire.
I ran the Hooker 13/4 Super Comp headers with Flowmaster mufflers with turndowns right off the end of the mufflers.
I decided to step up to Stock Eliminator with the associated cost of a 10,000 engine,$4700 Transmission,and $2700 Headers (from Mark and worth the money).Pure Stock is a great place to run and very cost effective. All of the S/SS associations around our area let these cars run as they are a part of IHRA Stock Eliminator.
I am putting together an '80 Aspen 318 4bbl.car for Pure Stock and local brackets.The 318 HP combo uses many of the same parts(heads,cam ect.) as the 340 and 360.
Good luck with your car.
Jeff Ross
IHRA G/SA 313
NHRA F/SA 3313

[Myron Piatek]

I've been using TTI 1 5/8"-1 3/4" step headers for many years. After the first couple of years of tuning, I added the TTI 3" X-pipe and Dynomax Ultraflow mufflers ending at the rear housing. After removing the extra 60-70 lbs the exhaust system added from elsewhere in the car and a little more tuning, the car was between .05 and .10 faster than the best I could get with their open header and collectors.

I may try the Dynomax bullet-style mufflers at a later date to save weight and have more room around the differential. But I don't know off hand how specific the IHRA Pure Stock rules are pertaining to mufflers for your application.