Thomas (Login broncosaurus) Member from IP address 24.181.100.14
Im looking to buy a new carb for my budget mud/dirt racer toy and would like to have some opinions. The vehicle is a 89 ranger long bed body adapted to a 79 f-150 4x4 chassis with 3.50 gears running a c-6 automatic with a 1800 stall converter running low range in the transfer case. Its got a 400 with stock bottom end, 4v closed chamber heads, offenhauser dual port intake, headers and stock ford ingnition. The cam is a lunati voodoo #62502 with 219/227 duration and .540/.552 lift. I was running a 600 holley vac secondary that run good but had a problem with the idle circuit so i tried a 670 holley truck avenger that my buddy had. The truck avenger felt stronger than the 600 but had gremlin that i couldn't get out. The max rpms the motor runs is 5000 where it shifts. The holley carb selector says a 600 is what a 400 needs that runs max 5000rpms. I am considering the holley 1850 600 vac secondary and the holley 3310 750 vac secondary. I want good throttle response out of the hole but is the 750 too much carb for what im doing? The races are 150ft length track at wide open throttle. Thanks for your opinions.
I do a lot of work for Cobra replica owners. Some of them buy Roush engines which come with Holley Street Avenger carbs. I get numerous emails and phone calls from guys trying to "fix" them.
For your setup, I would do a 750 vac secondary. I get excellent results from Quick Fuel and I would recommend one of their HR series carbs.
Yeah i was thinking the 600 mite be leaving some power on the table and was leaning toward a 750. By the way, whats the deal with the avenger series carbs? I have read lots of bad stuff on the internet about the truck avenger carbs. Thanks for your input.
Most of the complaints that I get follow along the same lines as the complaints I used to get about Demons....trash in the bowls, orifices not drilled through all the way, missing parts, etc.
I've sent several custom built Quick Fuel carbs as replacements to the Avengers and the owners say that it's a night/day difference in performance.
I do have a demon 750 dp carb on another engine i have that i could swap onto it as a test. But i still got to get a carb so i have one on each engine. I also have a 351m/400 street dominator intake setting on the shelf. I am using the 400 offenhauser dual port because it covers the 4v ports with a standard gasket. Believe it or not but the out of the hole velocity of the offenhauser dual port with 2v ports on the 4v heads is phenomenal. I have run the street dominator on a set of 2v heads before and it ran good but i doubt it would out torque the dual port intake from idle to my 5000 shift point.
Went ahead and bought a new 3310 holley. It seemed to be the best buy and fit for my project. I do have the 750 demon double pumper i can swap onto it from another motor if need be.
