Yes, I am aware 2Vs and 4Vs are rated differently [1.5 ins. vs 3.0 ins.]. Also, 70% of the 2V rating would about equal a 4V rating. I did the calculations for my 260 at 5200 rpm [about all you can get out of the stock exhaust manifolds] and at 85% VE the cfm needed is 332. A long way from 480!! However, according to what I have been able to find out [correct me if I'm wrong], the 1.21 2V is rated at 351 cfm "2V" and at 70% for 4V rating, it would be 246 cfm. I mention the 4V rating so that we are trying to talk apples to apples. I know what you said about the California 1.08 flowing differently, but 1/2 of 480 cfm is 240 cfm and the 1.21 flows 246 cfm [4V]. ON "paper" there should no difference between the two at a constant 900 rpm in drive, which is where the problem occurs.
Can you educate me on the differences between the Calif. 4100 and a "standard" 4100? Also, I have #48 jets primary and I will see if I have anything smaller. If I decide to stay with this carb, should I reduce the size of the secondary jets as well and if so how small?
I would like to talk to you about the above. If that is OK, send your # and best time to call to my email address rbrainard01@comcast.net
Thanks, Rob
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HAVE A NICE DAY!!!!