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In this Discussion
- novaman72 October 2008
- Oldcar_Mechanic October 2008
- phil40_1 October 2008
1972 Nova Clacking Noise (Pushrod?)
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Well, I own a 1972 Nova with a bored (.40) 350. It is my everyday driver and has ran good, until last night. I was coming home from work and the car started making a clacking noise, not a grinding, but a clacking. I figured it was the rotor in the distributor. Nope.... now I am starting to think I bent a push rod in one one of the back valves. The motor is built to race, so I thought. The lady we bought it off of said the guy she bought it from raced it. It does have a nasty cam (375 maybe), MSD and gears out the ass. If it is my push rod bout you tell me how to fix it?
Any Advice if good.
Thanks,
Will:cool: -
Way to many possible problems to be able to determine here, could be anything from a bad cam to a broken valve spring, thats if the noise is in the valve train at all. Could be deeper in the motor. My suggestion, if its beyond your knowledge base, take it to someone that you trust to have it fixed.
Sorry this wasn't more help, Phil. -
I agree with Phil. You need to find the problem before you go off trying to fix anything. Take a compression check of the car to determine if you have any low or bad cylinders first. The car should run noticably rougher if you did bend a push rod.
Another thing that Chevrolet had a problem with as to noise was the puel pump and push rod for it. They sounded like a bad lifter with a loud clacking noise.
Use a stethascope, rubber hose or large screwdriver to determine where the noise is coming from.
Keep us posted.
Ron -
Thanks for the help. I had a friend look at it who builds motors for GM Corp. We took a hose and listened to the valves. The sound seems to be coming from the top of the engine, on the passenger side, in the valve closest to the firewall. We think a valve popped loose and is shaking around in the chamber. I won't be driving it until we fix upen her up Saturday. I'll let you guys know how it goes.
