Posted by glennster on April 19, 2012 at 18:30:59 from (99.90.9.153):
friend brought in a 65 scout with running problems. fresh engine rebuild,pistons, rings, bearings, cambearing, head rebuilt. carb was sent to national in florida, rebuilt and tested there on an engine. has a 1 barrel holley, 196 cu in 4 cylinder. main jets are # 52"s. truck will only run with the choke fully on. it has been to 2 other shops and no one has yet to find the problem. as soon as you try and push the choke in, even a little, the truck dies. it did this before the complete rebuild too,was purchased about a year ago with the same problem. timing is solid at idle, 5 deg btdc, compression is 125 psi across the board. cam timing is correct. no vacuum leaks that i could find. the engine is running very rich with the choke on, but it does backfire occassionally when trying to rev it. also, engine lags when you try to rev it. there is a 1/2 inch pcv hose coming from the intake below the throttle plate that connects to the valve cover pcv valve. valve is working. removing the hose from the valve,the engine rpm just about doubles and revs good with the choke closed, but dies as soon as you try and open the choke. the old fuel tanks were replaced with poly tanks, along with all new fuel lines. no difference. also ran fuel from a seperate tank with an electric fuel pump, running 4-6 psi fuel pressure. no difference. new spark plugs, new points and condenser, cap rotor wires, distributor has been rebuilt. about the only things that are original that havent been gone thru are the intake and exhaust manifold. engine has about 22 in of vacuum at idle too. fuel filter is clear. oil bath air cleaner on or off the motor makes no difference. any ideas???
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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