CLASS RACER FORUM - View Single Post - 2-barrel Roch Only Questions

oldskool · 10-07-2021, 02:39 PM

OK, here's another possibility to consider.

'73/'74 Pontiac 350 2-barrel. 210hp factor

http://www.classracerinfo.com/Engine...3&MAKE=Pontiac

Venturi size 1.186. I assume that is a "small" one ?

Looks like it would have to run the 16lbs/hp class. So, with the current 13.45 index, it would need to run low 13.40's, on a bad day/slow track. IMO, that's a tall order for a 2-barrel low compression 350 Pontiac.

What do you 2-barrel experts think ?

Just for kicks, I looked up the '73 Chevy 350 2-barrel. It has a 230hp factor & needs to run real high 12's. But, it also has a bigger carb, 1.250 venturi size, and more compression.

I just don't know how to estimate probable power output & ET's for the Pontiac, considering the smaller carb & less compression. There is only 20hp difference in the 2 hp factors. So, would the bigger carb & more compression give the sbc more than 20hp advantage ?

Just looked on Class Racer Info. Seems that for '67-'73 400 & larger cubes, there are no venturi sizes listed for any 2-barrel. Are they listed on the official NHRA site ?

10-07-2021, 02:39 PM	#2
oldskool VIP Member Join Date: Dec 2014 Location: The Land of Bayous, Boudin & Crawfish Posts: 1,668 Likes: 223 Liked 747 Times in 362 Posts	Re: 2-barrel Roch Only Questions OK, here's another possibility to consider. '73/'74 Pontiac 350 2-barrel. 210hp factor http://www.classracerinfo.com/Engine...3&MAKE=Pontiac Venturi size 1.186. I assume that is a "small" one ? Looks like it would have to run the 16lbs/hp class. So, with the current 13.45 index, it would need to run low 13.40's, on a bad day/slow track. IMO, that's a tall order for a 2-barrel low compression 350 Pontiac. What do you 2-barrel experts think ? Just for kicks, I looked up the '73 Chevy 350 2-barrel. It has a 230hp factor & needs to run real high 12's. But, it also has a bigger carb, 1.250 venturi size, and more compression. I just don't know how to estimate probable power output & ET's for the Pontiac, considering the smaller carb & less compression. There is only 20hp difference in the 2 hp factors. So, would the bigger carb & more compression give the sbc more than 20hp advantage ? Just looked on Class Racer Info. Seems that for '67-'73 400 & larger cubes, there are no venturi sizes listed for any 2-barrel. Are they listed on the official NHRA site ? Last edited by oldskool; 10-07-2021 at 03:12 PM.