2021, 2022 Pure Stock Drags

Very impressive! You’ve done an excellent job dialing it in, very potent!

I will also update this with results from the F.A.S.T. frostbite nationals at US131 Motorsports Park on October 28th. Unbelievable weather and track conditions yielded new personal bests for most cars there. At noon, the density altitude was still -400' !

My 70 AMX ran a new best of 12.60 @ 108. I was paired with a clean original paint 340 Duster (that qualified with a 12.61) for the best of 3 shootout, and managed to win the first 2 by reaction times to take the W. We ran the 3rd round for fun, and I proceeded to shift from 1st straight to 4th gear and watched the 340 drive away lol... At least I now know that the AMX will run 13.34 going from 1st to 4th in good air 😄

Great way to end the season!

20221103_193759 by Joe Pinsoneault, on Flickr

Edited by n2ojoe - Nov/21/2022 at 7:55am

Fantastic job, Joe! I hope to be doing this one day.

67 Ambo conv
68 AMX
68 Ambo 4 door
70 Ambo 4 door
(2) 71 Hornets (1 SC/360)
73 Hornet 2 door
77 Matador coupe
77 Sportabout
78 Concord 2 door
81 Concord wagon

n2ojoe wrote:

Here is a little coverage of the event. Bill Ketchum's Ambo wagon even gets a little feature!

https://youtu.be/RG5xLDuNOvU

Need a couple more of those so he can circle them wagons.

n2ojoe wrote:

As far as the stock iron intake and exhaust manifolds, they definitely are a restriction along with the 4300 carburetor. What I have learned is that the combination of an increase of compression and a small duration, wide lobe separation cam installed retarded really works well.

We know that the limited induction simply does not support 390+ cubic inch over 5000 rpm, so I tried to maximize torque in the midrange.

I have custom Race Tec pistons to max out the 1.5 extra point compression rule for 11.7:1. I currently have the Lunati 256 cam with 213/220 duration and 112 LSA installed 4 degrees retarded. It idles super smooth and the high port velocity makes killer throttle response and torque. It dyno'd at 369 hp @ 4900, and 450 lb/ft at 3500. I also think the small Summit cam would be a good choice for this combo.

The T10 is a 2.43 ratio, rear axle is currently 3.73. The launch on the stock size Polyglas is tricky and takes a lot of practice. I try and hold 3000 rpm while staging, then slip the clutch and get rolling enough to feel the tires bite before fully releasing the clutch. An auto trans would sure be quicker, but I like the challenge of the T10. Shift at 5000, finish line is 5300-5500.

LOL, no huge secrets here! I've actually already spilled the beans on the combo back on page 3 of this thread. I'd love to see more AMC's get involved! All the rules are on the Pure Stock drags website: www.psmcdr.com