what class can i run

[Duster 318]

i have a stock 1970 duster 318 with a 2 barrel carb. and i was wondering how to figure out what class it fits in thanks.

[Lew Silverman]

If you look at the Classification Guide, the 1970 Duster with the 318 2-bbl is factored at 15.32 so I believe that would make it a natural "O" car. Of course you could add or subtract from the advertized shipping weight of 2834 lbs (+170 lbs for the driver) and run "N" or "P". The horsepower listed is 185 factored down from the factory 230 HP.

I am sure there are more than a few folks on here who will be able to give you the pro's and con's of this particular combination. I think I remember that the 2-bbl has been a problem, but I could be wrong.

Good luck with your project!

Lew

[Mike Carr]

1970 Duster, 318 cid, 230 hp factory rating, de-rated to 185 hp by NHRA (190 hp with the NHRA-approved aftermarket cylinder head Edelbrock 60767 ). Factory shipping weight of the car is 2,834 pounds. Divide the shipping weight by the horsepower to get the weight break to determine which class(es) a car can run.

Weight break is 15.32, putting the car into O/SA (or O/S with manual transmission) With weight adjustment, can also run N/SA and P/SA.

In Super Stock, motor is rated 195 w/OEM head; 205 with Edlebrock head. Weight break is 14.53. Car falls into SS/MA, and can run SS/LA and SS/NA.

To get minimum weight for each class, take the 'top' weight break for each Class. For O/S-O/SA, 15 x 185 + 170 = 2,945 pounds min wt across the scale, with driver, at the conclusion of the run. Each Class has it's own weight break, so use that weight break to determin min wt for each eligible class.

All cars listed here that are eligible for NHRA Class Racing: http://www.nhra.com/competition/classification.aspx

Explanation of Classes, Class Weight Breaks, etc that I wrote for the site:
http://classracer.com/classes.html

[Duster 318]

thanks for the info! i came up with O/SA also but i wanted to make sure i was correct

[Rory McNeil]

And if it helps, we have a local racer with a 318 2 barrel that runs high 12s as a legal Q/Stocker.

[Duster 318]

wow. mine should run high 12s also

[Sam Capizzi Jr]

I highly doubt that you can to run high 12s with a "legal" 318 2barrel. The 185 horsepower rating is about 10 hp to high. That's at legal P weight for a 1973 dart swinger at 3130 pounds

[dartman]

My 2 cent

The difference in cost to build a 340 over a 318 wouldn't be that much.spend the money wise and do a 340 combo.lot of good used part out there for sale.and you will like the power of the 340.

[Sam Capizzi Jr]

Originally Posted by dartman

My 2 cent

The difference in cost to build a 340 over a 318 wouldn't be that much.spend the money wise and do a 340 combo.lot of good used part out there for sale.and you will like the power of the 340.

X2. I totally agree.

[Billy Nees]

Originally Posted by dartman

My 2 cent

The difference in cost to build a 340 over a 318 wouldn't be that much.spend the money wise and do a 340 combo.lot of good used part out there for sale.and you will like the power of the 340.

You had better be willing to give that fellow more than your 2 cents if you convince him that he can do a 340 combo for not much more than a 318!