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390 timing

Started by eugene, January 15, 2010, 11:52:37 PM

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eugene

I have a 61 cad with the 390 motor.  Wont run.  HAs fuel and spark.  I think it is out of time. What is the easiest way to get it in to time?

Carfreak

Enjoy life - it has an expiration date.

Dave Shepherd

Pull #1 plug, turn the engine over till you feel compression coming up, you can then put a bent piece of coat hanger wire in the plug hole to see when the piston reaches tdc, then remove the dist cap and see if the rotor lines  up with #1 plug wire. At this time if it is correct the timing mark on the balancer should be at tdc also.

Dan LeBlanc

Dan LeBlanc
1977 Lincoln Continental Town Car

eugene

as it turns out the ignition coil was hooked up backwards and both the coil and points were bad.  I installed a new coil and a petronix ignitor and plugs, cap, and rotor.  Also the carburetor had vacuum leaks due to the metal vacuum lines being cross threaded into the carb.  I replaced it with a holley.  It runs pretty good now but still acts like it may have a vacuum leak somewhere and it definitely has an exhaust leak.  I put timing light on it and it is reading just past 10.  What should the timing be?

The Tassie Devil(le)

About 8 degrees BTDC, with the Vacuum off and plugged but would depend on the quality of fuel being used.

Plus, what Plug Gap does the Petronix recommend?

Bruce. >:D
'72 Eldorado Convertible (LHD)
'70 Ranchero Squire (RHD)
'74 Chris Craft Gull Wing (SH)
'02 VX Series II Holden Commodore SS Sedan
(Past President Modified Chapter)

Past Cars of significance - to me
1935 Ford 3 Window Coupe
1936 Ford 5 Window Coupe
1937 Chevrolet Sports Coupe
1955 Chevrolet Convertible
1959 Ford Fairlane Ranch Wagon
1960 Cadillac CDV
1972 Cadillac Eldorado Coupe