Need some help

[Tic's60]

But first here's some help http://www.bgsoflex.com/auto.html it's automotive calculator site, HP, Gear ratio etc.

Ok on to me. Though I do not run a 09 I do run a 60 with a 96 that's on the mild side of wild.
I decided I would "try" a Holley over my Carter Comp. Never built one or even realy tuned one. After rebuilding the 4780-2 800cfm DP, 70 primary 85 secondary jets with 37 center squirters 30cc and 50cc pump 6.5 Power valve, including resurfacing all mating surfaces, removing choke horn, flowing and deburing the entire thing I finaly got a chance to run it. dam these things got lots of gaskets!!
Using my new Holly Red fuel pump, pressure is a steady 7psi the beast fires over and idles pretty good. But at 1.25 turns on the idle mixture I am still running rich. Not real bad but rich enough to turn my Champion platinums black. But man can I tell the throttle response difference VERY crisp after it warms up.
Soooo I am looking for a few good tips from some Holley people on what I should try to lean the beast down. 2-4 jets smaller and or smaller power valve??? Or a good book<G> All would be appreciated.
Oh why the change to a Holley you ask. Just to try it and see if it works better.

thanks and happy new year

M;)

[models916]

You really need a Holley tuning book, it explaines it all pretty well. The problem with big cams and Holley carbs is that you have to turn up the idle to get them to run. When the throttle blades lift past the idle slot in the bore the engine pulls gas thru the booster and runs rich. First step is check vacuum at idle in gear. get a power valve 2 to 4 numbers lower. This has a VERY MINOR effect on idle quality, but some. If after setting the idle speed the throttle blades are above the idle transfer slots, you need to drill holes in the blades (I don't recommend this, but it works) or install secondary throttle adjusters to let air into the engine without making the primary blades open too far. You can get these at Jegs from Quick Fuel. There are little screws on the secondary side of the base plate, but very hard to get to and adjust. You really need a tuning guide for Holley to get it all right.

[gearhead409]

Models has it right. with these changes you can get an engine with a very big cam to idle 800-1000 rpms without loading up. to really understand the holley you need the book. i'am not a big holley fan but they are the choice for big horsepower and there's more info. available to tune them than any other carb on the market.

[gearhead409]

Tic. the last 396 i set up with this carb and an L88 cam, i think i opened the holes up in the primary throttle blades to .125 dia. and timing set at 14 degrees. of course each engine will be differant but this should get you in the ballpark. ( don't wear the bolts out, you will be taking the carb off a number of times to get it right) this carb should have an adjustment screw for the sec. throttle blades, you might want to open them just enough to see light around them and try it before you drill out the primaries.

[4onthefloor]

Very good advice Gearhead...I've had to drill those holes myself...L88 is a sloppy cam on the street too...don't underestimate those powervalves...if they are incorrect they can dump fuel and cause the problem too...lots of guys eliminate them altogether.

[Tic's60]

Excellent advise all they way around! I was wondering about drilling holes or opening the secondary's a little. I ordered a vacume gauge so I can see whats happening so I can adjust the PV as needed. With 40 degree weather it makes it tough to tune but I should be able to get her close.

thanks!!

M;)