Who's the Holley nerd (hopefully that's complimentary?) that can help me find the correct fuel bowl gasket ? The information I have is that this is a "billet 1000 CFM carb". I don't see any billet but I haven't taken anything apart as of yet either. My rear bowl is leaking pretty good. From what I've read/watched, I should have a stamping that will tell me the series of carb I have. The only thing I can see is the cast in numbers in the throat of the carb Thanks for any assistance from any of you fuel mixer folks
If it is a 4150 carburetor, these gaskets should be the ones, https://www.holley.com/products/gaskets/carburetor_gaskets/parts/108-83-2 Take the leaking gasket off and compare?
2 corner idle ( if correct metering blocks and base ) and down leg boosters so probably an early series 750DP ( #4779 ) or a 850DP ( #4781 ) . if bottom throttle bores are 1-11/16" = 650 - 750 if bottom throttle bores are 1-3/4" = 850 got numbers on the metering blocks ? carb list# is normally on front of choke tower - gone ! yeah , standard bowl gaskets should be ok . ----------------------------------------- 50cc pump front ? 30cc pump rear ? - backwards for a 850 . 750 uses 2 30cc pumps . not original bowls - rear is newer dual feed style . if i saw it at a swap these 2 things would kinda be a red flag .
Thanks for the info. I just need to carb to work for a season or so. Came with the car as it is. I'll likely move this to some fuel injection in the future but need to complete paint and put everything together (interior, exterior, tires/wheels, etc). I would guess if I were to "use" the car as it is, some spark plug reading after a hard pull would be good to take a look at? Look for some chocolate colored plugs in every hole before I really push it?
Unleaded fuel will not color the plugs like leaded fuel does. The plugs may look white even if the engine isn't lean.
So , you are in Utah looks like . Not me obviously but maybe look local for someone that can pop it apart , inspect and reassemble . If you are lucky should just take a basic kit . If you have anyone you know with a known good running motor maybe try your carb on it quick to confirm runabilty .
Holley carb is being kind of a Holley carb (I've never had awesome luck with Holley stuff...yet I want a Sniper... Hrrrrmmmm). Car wont idle well all of a sudden. Stumbles a bit and seems to be running REALLY rich. Found a leak at the rear accelerator pump. Grabbed a new gasket/plunger at the local O'Reilly's along with a fresh fuel bowl gasket and put everything back together. It's better but still won't idle. Trying to figure out if I am ready to buy the fuel injection or buy another double pumper. I live at 4500' and will likely drive over passes at 8000'. Usually I'd have to rejet a carb to make things "right". I haven't messed with a carb for well over two decades. Not sure what to do. Sleep on it would be a wise thing for sure
Sounds like a bad power valve. I’d get a quality kit like from AED and go through it, and get it back to its out of the box settings.
At 5000-8000 feet, that carburetor will run rich to begin with if it hasn't been re jetted. If it is box stock and has never been touched, but it suddenly does not want to idle, I agree with Dave, blown power valve. If you turn the idle mix screws all the way in, will it stall the motor?
https://www.holley.com/blog/post/how_to_tune_the_power_valve_in_a_holley_carburetor/ Seems like a good source article?
