This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. JavaScript is disabled. The first step is to ensure that there are no vacuum leaks, so check all the hoses leading to and from the carburetor and intake manifold for cracks. Read More, We head to Lake Tahoe, California to find out if Ram’s new Raptor fighter has what it takes to dethrone the king of off-road pickups. It'll do what it wants too". Well if I should have had 71's in it like Kelly suggested, I am only 3 jet sizes over. 83 Capri RS T-Top 302, Afr 195 Renegade,11.2 compression, e303 cam, Scorpion 1.82 race series rockers, TFS-R, X3Z w/Tweecer RT, T56 Magnum, 2 1/2" Pypes X pipe w/2 chamber Flowmaster mufflers. "For those that will fight for it...FREEDOM ...has a flavor the protected shall never know.". 64s are 600 primary territory. 10 jet steps say "big problem" somewhere. 1969 Fastback-1 owner-302 TFS Heads, Bigs 650 DP, Comp Xe262, Speedpro Rollers, Vintage S2MS Cobra intake, Flowtech Ceramic Headers, C4- JPT valve body, 2600 stall, 3:55 Detroit. 1970 SS454 LS6 SuperCar certified stock appearing,, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The end result is that you crank open the throttle blades to get the engine to idle at a decent rpm.
it runs great other than a flat spot right off idle. I have had engines go all the way up to a 9.5 power valve.
70 Maverick Grabber, 5.0 (Perf. A forum community dedicated to Ford Mustang owners and enthusiasts. the size and length of the idle well in the metering block act as a idle channel restrictor, we have been slighty enlarging the diameter of the idle well to solve the lean off idle problem we are seeing with a carb like yours. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! It doesn't stumble If I am hard on the gas. What squirters in there? The engine should be turned off while you are setting the adjustment on all of the screws., VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. That's a fair amount of cam for a 355,I like 16 or so degrees initial, think the total is close. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Regardless of how you approach the repair of this problem, the key is the proper relationship of the throttle blades to the idle transition slot. All Rights Reserved. According to sources I found online, the 4777-5 Holley double pumper originally came with number 28’s in both the front and rear, so somebody must have changed these already (I’m pretty certain I acquired the carb second hand). Did you put the check ball back in the secondary housing? Get a good vacuum gauge and see what vacuum you're getting. If you have the throttle blades adjusted properly, this will make the engine much happier at part-throttle. Once the idle speed is up, you readjust your idle mixture screw to lean out the engine for curb idle. To modify an existing carburetor, all you have to do is disassemble the main body and baseplate and drill a hole through the carb stud hole, and you're ready to reassemble the carb. The power valve is what is supposed to give you a bump in fuel under light acceleration. Hook your laptop up and increase your acceleration enrichment by a few miliseconds at a small percentage of TPS change. A forum community dedicated to Ford performance owners and enthusiasts. To me, it sounds like your power valve isn't giving the bump the engine needs in fuel. Don't let all of these small details overwhelm you. Usually lugging through a parkinglot in 2nd gear or just cresting a slight hill in 4th letting out.

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