what class can i run

[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!

[Paul Wong]

Originally Posted by 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

It can be done, but it is not easy. I got a legal 273 2 barrel 4 speed valiant in the 12's in Q/S that went through several NHRA teardowns and was looked at at Indy in 2005.

A good fuel system helps a lot with a carburetor with small volume like a mopar 2 barrel.

[Sam Capizzi Jr]

Originally Posted by Paul Wong

It can be done, but it is not easy. I got a legal 273 2 barrel 4 speed valiant in the 12's in Q/S that went through several NHRA teardowns and was looked at at Indy in 2005.

A good fuel system helps a lot with a carburetor with small volume like a mopar 2 barrel.

Paul when you say good fuel system are you talking volume or pressure? And do you run the carter 2bbl