new edelbrock 2-4 intake and holley vac second manual choke rich out of box,plugsfoul. 5 lbs on regulator. lunati 577-600 lift mech flat tappet cam,how to proceedfor street tune.
there is a similar post over at chevyhiperformance...a few things... both carbs have to have the idle transition slots covered.. so back off the primary idle speed settings.. or flip the carb over and hold choke open and adjust throttle blades on both primaries ...which model carbs did you get.. carb number...once in a while.. they are equipped with a hidden idle air bypass screw under the air cleaner stud.. look at this image... with the throttles closed... you have to be supplying fuel only thru the idle circuit that dumps below the throttle plate..or you will be TOO RICH... below is probably whats happening with your engine...the idle speed setting is exposing too much idle transition slot and flooding the engine..to increase idle speed.. you will need.. depending on the carb.. to either open the idle air bypass under the air cleaner stud.. you can see that in the middle image above.. you can open the secondary throttle blades slightly.. there is a secondary idle stop screw... you can create more of a vacuum leak with a a PCV Valve... with a filter on it.. i mentioned on the other forum post.. about either using a fine pitch metering valve with a filter.. so you can easily control the idle air bypass and the idle speed.. as for a street tune.. hmm...get it to idle first... without fouling the spark plugs.. next.. do you have an oxygen sensor bung in the header collector.. or room to bolt in a spacer thats threaded for an oyxgen sensor.. so you can use at the collector a 3 wire 94/95 chevy pickup 3 wire oxygen sensor and a narrow band air fuel ratio display.. or the bucks to invest in a wide band set up.. so you can see what the air fuel ratio is doing as you change the engine RPMs..there are several circuits you are going to be dealing with .. before you start changing primary main jets...the idle mixture screws.. the idle transition fuel restrictions.. the primary main jets..but you will also be working with the accelerator pump cams.. and the accelerator pump shooters.. then the power valves.. that are set by what the good running vacuum is... half the manifold vacuum.. is where its usually set at.. might be slightly different for a tunnel ram...when you come off idle slowly.. the primary throttle blades expose more of the idle transition slots and start pulling fuel from those.. via the IFR.. idle feed restriction.. this is before you have the throttle open far enough to get fuel out of the primary boosters.. there is also .. a LOT of plenum volume to enrich the fuel as you open the throttle.. so its going to be a challenge.. larger shooters... faster accelerator pump cam opening.. again.. watching the air fuel ratio display.. to see if you are going lean or going rich...this way . you don't have to pull the spark plugs.. and that is only how you tune the primary and secondary main jets for wide open throttle calibration..
Thanks for taking the time to lend a hand, those carbs new out of box 1850c
600 CFM Four Barrel Street CarburetorPART #: 0-1850C1 timed (spark) port, 1 full vacuum, and 1 PCV porthmm... PCV ports...and 1 full vacuum port in each...hmm... well.. if you want to try something.. do you have access to grainger???you could get some 90 degree elbow PCV vacuum hoses .dorman 46001 or 46002. run them into some 3/8 hose barb x 1/4NPT fittings.. and a 3/8 hose tee.. to one of these.. or one of each.. punch the part numbers into grainger.. Needle Valve,Straight,Brass,1/4 In.Item # 6MN30Needle Valve, Straight, Body Material Brass, Pipe Size 1/4 In., FNPT x FNPT Connection, Stem Type Brass, Seal Material Metal, Handle Material SteelGRAINGER APPROVED VENDOR6MN30 $9.60 Needle Valve,Straight,Brass,1/4 In.Item # 6MN32Needle Valve, Straight, Body Material Brass, Pipe Size 1/4 In., FNPT x MNPT Connection, Stem Type Brass, Seal Material Metal, Handle Material SteelGRAINGER APPROVED VENDOR6MN32 $10.17these should allow you to adjust the idle speed and keeping your primary and secondary throttle blades as far closed as possible... its worth a try... if it works.. put a filter on the inlet..or PCV valve on one.. and the metering valve on another.. so you have some fine tuning...
It is alive. Thank you gearheads for all you input. I started from scratch,toreeverything down back to the beginning.shotgun scoop breathers everything.I readjusted the idle mix screws 2 1/2 turns out all four corners, fuel pressure at6lbs psi but most of all I put a wire on the mech chokes which were closed all theway when I opened everything back up, my mistake daa. That old rat came alive andI ran for ten minutes no fouled plugs THANKS for making me take a look at my mistakeJIM