This winter I have been reading old mopar mags and wondering how people have such fast cars.

These are near stock 340's, 318's and mild 440's running consistently in the 12's in the quarter.

The last time I raced was with my mild 440 and my best time was a 15.4 @ 94mph. Embarassing.

Anyway, since then I have put a 383 in my car and haven't made it to the track.

Here is the currently combo
1971 roadrunner

-383 with 9.1:1 compression

-comp XE262H 462/470 lift 262/270 duration cam

-mild pocket port 452 heads with stock "smaller" valves.

-Mopar M1 dual plane intake

-Edelbrock 750 cfm carb with K&N filter, open 6pak scoop hood.

-Headman headers, 2-1/2 dual exhaust with X pipe.

-FBO electronic ignition, mechanical advance

-automatic trans, 2400-ish stall converter

-Sure grip rear end with 3:55 gears

Our elevation here in utah is approx 4500 feet above sea level, and the car runs awesome on the street. Definately not a king of street, but reliable and runs strong.

I have yet to run this combo at the track, but I have seen "stock" 383's run low 13's in the quarter.

Is there any reason why this combo I have should not dip into the 13's?

Anyway, for a cold day here in Utah this is all I have to do at the moment, so what are your thoughts?

Oh, the dream (if finances permits) would be a keisler 5 speed behind this setup, which would really wake it up!

anyway, thanks for reading, what are your thoughts?

eight

A big part is your altitude. At 4500+ ft your probbably 1 to 2 seconds slower than if you were running at sea level.

The cars weight, gearing, and traction (60' time) also make a big difference. If you can launch the car at 5,000+ RPM and get it to hook you could reduce 60' times by about 1/2 second compared to launching at low rpm because the car won't hook up.

Tuning is a big one, many performance combos fall short because of a poorly tuned carb/distributor advance curve.

My old 383 was very similar to yours, with a little more converter and gear. It ran 13.7's at 101 in a B-Body on street tires, and I was pretty happy with that. I'm in the Seattle area, with little / no altitude. I don't know what the altitude will do to ya, but I would think mid/low 14's should be do-able.

Thanks for the reply guys...

I will run a baseline when the track opens and go from there.

The intake is the mopar M1 dual plane, I should specify that. I wouldn't dare run a single plane on this motor!

I have decided if I do make a cam swap, I will change up to the comp XE268H and swap to a 2800 stall converter.

This way I am not going major overkill and still am streetable for the 200-300 mile road trips.

Plus, the cam is still close enough to the cam I have now so I don't think I will have to mess with the distributor.

Anyway, thanks for the input. I really appreciate it!

Any more ideas out there, keep them coming!

Should be fine with M1 dual plane let us know how it runs!

Had a 69 RR w/4 sp,383 4 barrel and 323 gears. Stone stock ran 14.79 with 90,000 miles. When I pulled the motor it barely had a lip at the top of the cylinder.