Re: Switch to 2bbl
 

Well you got me thinking, just checked on a 318 mopar in 70 & 69, 70 was 185, 69 - 172. Really, was there that much difference between the two? Hope someone who runs one can chime in.
Sorry if I jumped rails here.
Mike
The factor for the 70 is 15.32 and the 69 is 16.70. What class are these?
Mike

Re: Switch to 2bbl
 

its funny the 318 in 68 is rated higher, even though its the same engine. I am going to asdk the powers that be to get the lower rating on the 68

Re: Switch to 2bbl
 

70 would be O/S and the 69 would run P/S

Re: Switch to 2bbl
 

Thanks, but finally figured out where to find that.

Re: Switch to 2bbl
 

Mr Money, It really doesn't matter what the exact number is. Both will run way under.
They run J and K/SA with a 4 bbl ,and R and T with a 2bbl, and you're better off being in R and T.

Re: Switch to 2bbl
 

You're not using http://www.classracerinfo.com?? Shame on you!!

Re: Switch to 2bbl
 

If you were to get a proper 2bbl camshaft ground how much would it differ from a 4bbl grind? I’m under the assumption that you’d want less duration when you go from a 800cfm q jet to a 350cfm 2bbl. Thought hard about doing this with 350/255 before selling, I didn’t think there’d be much difference in the 69-71 350 going from 750 to 500 cfm but these later engines loose a lot more airflow capability

Re: Switch to 2bbl
 

I've used it many times, just didn't look in the right place, now I know. Great info and very helpful.

Re: Switch to 2bbl
 

So am I looking at about .5 slower for my 1973 Nova 350/175/287 horse set up? .390/.410 lift cam, good 882 heads, Boburka 207 quadrajet, dish pistons, metric 200 trans with 5.13 rear. Car weighs 3470 in H/SA but would weigh 3418 in L/SA with a 2 barrel setup. I figured it at .90 better minus the .5 tenths loss on a carb swap so overall about .4 tenths better class for my combo? Does this sound right?

Re: Switch to 2bbl
 

The index is .85 better and 50 lbs less so about .90 better but car slows up about .5 because of restrictive 2 bbl carb.