Visit The Dirt Forum for More Information

Author Topic:   Holley carb
eaton89
Member
posted January 23, 2004 08:04 PM
I have a holley 600 double pumper that I have to run in my class. Putting it on a metric with a 355, flat tops, humpy heads(1.94 v), 495 lift cam and matching 1.46 spring, victor Jr intake and car ways 3200 lbs. 1/4 mile dirt track. I need some advice on tuning carb( power valve size, accelerator nozzle size, accelerator pump sizes, accelerator cam color and jet sizes and any other tricks) I realize these will change from car to car track to track engine to engine ect ect. I just need a good starting place in hope of saving a little time or a few tare downs. I know I should probably get a book but I have bought so many lately and you guys are better than any books I've botten yet.


eaton89
Member
posted January 24, 2004 04:10 PM
Some one has to have a opinion here. Help!


Donnie Ross
Member
posted January 25, 2004 06:37 AM
go to holleys web site look up the stock setup for your carb it will give you a good starting point.tune power valve depending on vacuum of your engine.


dan ferry
Member
posted January 25, 2004 08:15 AM
for the power valve hook up a cheap hand pumpvacuum guage to manifold vacuum not carb base start car let it warm up till idle is steady well im ahead of myself here start on carb base vacuum warm engine and idle engine set idle miture screws on metering platewind them in till lightly seated and go out 1-1/2 turns and look at vacuum reading fine tun the screws equal amounts till get highest reading i do 1/4 turns on both at a time. after u get the most vacuum there go to manifold vacuunm and measure vacuum there start with a power valve thats 1-2" less if you have 6" go with a 4 or 4.5 the power valve is kept closed untill vac drops below valve rating and lets in more fuel. there will be a list # on the driver side choke horn area find it and look on mortec.com or holleys site and theyll have a list of what the carb jetting was fromthe get go probably around 69 try ordering a trivk kit for the carb itll have all the cams and if u have vacuum secondaries all the spring options and directions in it. sorry so long. some may tell you to block power velve and raise jetting but i dont think thats a good idea itll cause u to be rich coming off were u might wanna be a pinch lean to get a little boost rather than a sag


eaton89
Member
posted January 25, 2004 01:52 PM
Ha thanks for the info. I guess I better get the engine back in the car first.


dan ferry
Member
posted January 25, 2004 02:53 PM
ya got some time to ask around and I/M kp lugnut at kinetic performance a forum sponsor **** know what to do im having holley probs myself on my 460.


Back to the Archives