[Rixkix426]

Hi all. New here. I have a 1969 Plymouth GTX 426 4 speed that’s pretty much original. Beautiful car. Ive had the brakes including the master cylinder and booster rebuilt, fuel system overhauled and many other things done as it sat in a collection for 20 or so years. The issue I have now is a “clacking” noise seemingly coming from the valve train when under moderate load. I had the valves set and no improvement there. I‘m thinking sticking lifter? First, if its a lifter, any hints to free it up? I’m considering having the engine pulled and sent to a good place for a rebuild. If I go this route, any suggestions on who to go to? Thanks, Rick.

 

[ImperialCrown]

Make sure that what you are hearing is a mechanical problem and not an exhaust manifold runner leak.
In the Rochester area, I have used Drake's.

Drake Engines Inc. - Recondition Cylinder Head Exchange

Drake Engine's Inc. was started in 1974 and incorporated in 1978. We do machine work for new/used car dealers, garages and marinas. We also specialize in custom machine work on both Classic and Antique Engines.

www.drakeengines.com

 

[Rixkix426]

Thanks.

 

[Curious Joe]

Hi, and Welcome!

Did you just recently acquire this car? I may be wrong but I don’t think there’s much difference in adjusting solid lifters on any motor with screw tappets. I’ve always done it while the warm motor is idling, using the correct feeler gauges.

A great time to view valve train operation and likely malfunctions. Never worked on an elephant motor myself but I would be extra careful who I let touch this jewel. Don’t be afraid to get your hands dirty.

 

[chuzz]

If you think it's maybe a sticking lifter, I'd try a can of Seafoam or Marvel Mystery Oil in the crank case to see if it frees it up. Of course, I'd also recommend a full oil and filter change afterwards.

 

[Rixkix426]

I drained out a bit of oil and put in a quart of Marvels. I’ll run it around a bit and see if it loosens up.