425 ci Nailhead rescued from 20yr storage, now running. Not bad idle, but rev up and LHD rattles. Chased up vacuum leaks, some improvement, but still rough at higher rpm. Any hints on how to fix?
The 65 Riv was last registered in 1983 and hardly ever started since. After working on it off and on for a year it is nearly right. Looks OK but paint and some chrome faulty. Next jobs, radio antenna short circuit and possibly jammed, same story for headlight visor motor. Tail and turn indicator lights and wiring in hand, bumper is loosened and about to be taken off so I can get to tail lights etc. BTW car is RHD and in Australia.
Be sure the ignition is new: plugs, wires, cap, rotor, points/condensor, coil(?)...check compression while plugs are out. Then look at things like sticking valves, carb...
Coil, HT leads & plugs all new, distributor checked ok, compression test done. Need to check for sticking valves but not sure how.
Just checked acuum, steady but low, doesn't show sticky valves, indicates need carby tune, will try tomorrow.
It's plain and simple time to rebuild the Carb after a good long soak in a bucket of cleaner for the job! It's running ruff from clogged off Carb passages that can not pass the needed amount of fuel as the rpm goes up!
Thanks, I'll clean it tomorrow. Grateful for all the help so far, checked out all suggestions but only minor improvement so far. I'm sure that with the help I'm getting with all you Buick fans i will will win.
Could very well be the stainless plate under the carb. is rotted & letting exhaust gases into the intake manifold. Would NOT be the 1st. time this has happened. Tom T.
