I have a 1957 Chevy BelAir with a 1960's 327 Chevy engine with 485 miles on it. The car will not idle at less than 1000 RPM in gear.
The car has a 350 TurboGlide with a Corvette pressure plate, 1970's Chevy power steering, and non-power front disk brakes.
The engine has never run right since I have had the car. It has a mild cam that has solid lifters (the valves are set at.012 for the intakes and.018 for the exhaust). The distributor has a Crane electronic ignition in the old distributor. The engine runs a PCV Valve, but no other Emissions Control. The carburetor is a new 500 CFM Edelbrock.
There are no strange noises or leaks.
The vacuum when the car is in out of gear gear is 11 lbs at max and at idle in gear death-spirals to zero and the engine dies.
We have replaced the plugs and wires. We have also replaced the original Vacuum Advance which took 12 lbs to start to move the distributor plate with a Crane Adjustable Vacuum Advance which is set to move the plate at about 8 lbs. We also found using a flywheel wrench and a piston-stop tool that the TDC mark on the damper was about 8 degrees retarded. We remarked the damper and re-timed the engine to 10 degrees advanced.
We have not been able to locate any vacuum leaks and the vacuum at the manifold shows the same results as that measured at the carburetor port.
Any ideas? My neighbor and myself cannot find the solution.
Monday, September 17th, 2007 AT 6:38 PM