Switch to 2bbl

[HR9121]

Originally Posted by Coleydog

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

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

[Coleydog]

Originally Posted by HR9121

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

Thanks, but finally figured out where to find that.

[Dwight Southerland]

Originally Posted by Coleydog

Thanks, but finally figured out where to find that.

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

[Chipper Chapman]

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

[Coleydog]

Originally Posted by Dwight Southerland

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

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

[rboyle]

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?

[rboyle]

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.

[Billy Nees]

I think that you would probably slow down more than .5. You can't use the big 2V on your combo and the L index is tough.