what class can i run
 

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.

Re: what class can i run
 

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

Re: what class can i run
 

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

Re: what class can i run
 

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

Re: what class can i run
 

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

Re: what class can i run
 

wow. mine should run high 12s also

Re: what class can i run
 

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

Re: what class can i run
 

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.

Re: what class can i run
 

X2. I totally agree.

Re: what class can i run
 

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!

Re: what class can i run
 

i would do a 340 but i already have a good 318 with lots of extra parts

Re: what class can i run
 

Have you had a good look at it Rory?........

Re: what class can i run
 

Phil, as you know , I am a Ford guy, but yes, I have looked Toms pink 318 2 barrel Callenger a few times at Mission. He ran it at the LODRS meet, and also ran it in our stickshift group a couple of times. Was I missing something? He was running 13.0s and 12.9s with it.

Re: what class can i run
 

What type of fuel system would you run with the 2 barrel, fuel line
size, tank (or fuel cell) pick-up size, pressure, etc.?

Re: what class can i run
 

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.

Re: what class can i run
 

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

Re: what class can i run
 

Sal, its volume. Our little carburetors dont have much of a bowl and at 6000 plus they need everything they can get without the carb starving for fuel. Adding pressure fools with things as far as I can tell.

Re: what class can i run
 

That's very interesting....makes sense to me. My car runs 95 mph in 90 degrees or 35 degrees. I've tried diff fuel pressures from 6-12, no change. Stock needle and seat, stock jet size. When I go up in jet size the car drops right off ET and Mph

Re: what class can i run
 

when i tried to change my jet size up it made the car run slower e.t. and mph was down. it is a carter also and the fuel pressure can make a big difference with mine.