El.Padrino
Well-Known Member
OK cool man.
So... the 850 Speed demon is the choice?
Yes most likely! Summit has some discount right now and will buy this.
Thanks for all the support here again!!
OK cool man.
So... the 850 Speed demon is the choice?
Hey Ron, can you tell us a little about the two 950s that you ran? Do you know what venturi size they were, and did you track test them?
The "950" is such a misnomer. With venturi sizes between 1.375" to 1.590", and a couple different booster configurations they can flow anywhere from 820 cfm to 1000 cfm, maybe.
I did A/B testing twice at the track between my small venturi "950" and my 4781. The 950 was just a little bit better everywhere on the track. I tried to get the 850 to run with it, but could not get it there. In my case, I think between the gear, and the tight converter's low rpm shift recovery the 950 did better.
The funny part was that in the street, I had to work the 950 hard to get it to run as nice as the 850. Seems backwards. My 950 was so pig fat at transition/ low rpm cruise.
I usually tell folks that if they have a tight budget and are unsure what to buy, buy a used 850 and rebuild it because of how well they can run plus the $ savings. Otherwise, consult a professional and get the "right" 950.
Electric choke works better daily driver. Also will close partially under hard off the line acceleration to richen it up so you don't lean backfire through carb. Manual choke will stay open and then you get the lean backfire.
Respectfully disagree with the above. If the choke and accelerator pump are adjusted correctly, there should be no lean misfire through the carburetor once the engine is allowed to warm up...
Electric choke works better daily driver. Also will close partially under hard off the line acceleration to richen it up so you don't lean backfire through carb. Manual choke will stay open and then you get the lean backfire.
Hey Ron
A little off topic but are u running a pvc valve? And does that have any effect when setting up carb
Thanks Bill
My engine 383 stroked to 450 with a quick fuel 830 was set up and dyno at 530 hp. with just breathers on each valve cover just wondering if that will give me any problems