1978 460 engine chatter, rattle
New User
Joined: Jan 2008
Posts: 0
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Many posts removed 
Can you explain the sound more accurately?
How about the sound of a ball peen hammer hitting a piece of steel?
A small hammer hittinga piece of steel?
A big piece of wood hitting a piece of steel ?
How often does it make this noise ?
Clank.. clank.. clank..
Clank ..........Clank...........Clank..... ?
Can you explain the sound more accurately?
How about the sound of a ball peen hammer hitting a piece of steel?
A small hammer hittinga piece of steel?
A big piece of wood hitting a piece of steel ?
How often does it make this noise ?
Clank.. clank.. clank..
Clank ..........Clank...........Clank..... ?
Post Fiend
Joined: Jan 2003
Posts: 10,323
Likes: 2
From: Montana Territory
I have this problem too.
Its actually ultra light upper cylinder pinging. My best guess is to replace the vacuum advance on the distributor, which isn't advancing the engine enough at heavy throttle. OR you have a vacuum leak from the carb to the tee to the vacuum advance on the dizzy.
Its actually ultra light upper cylinder pinging. My best guess is to replace the vacuum advance on the distributor, which isn't advancing the engine enough at heavy throttle. OR you have a vacuum leak from the carb to the tee to the vacuum advance on the dizzy.
Thread Starter
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New User
Joined: Jul 2004
Posts: 6
Likes: 0
How do you fix piston slap?
This sound is RPM related. It starts out at lower RPMs Clack... Clack... Clack
and as the mph increase the sound changes to ClackClackClack. To the
point of sounding like rapped tapping at speeds greater than 65. Stop
acceleration and the sound goes away. *****
This sound is RPM related. It starts out at lower RPMs Clack... Clack... Clack
and as the mph increase the sound changes to ClackClackClack. To the
point of sounding like rapped tapping at speeds greater than 65. Stop
acceleration and the sound goes away. *****
Logistics Pro
Joined: May 2003
Posts: 4,238
Likes: 21
From: Northern Illinois
Originally Posted by WillySixGun
How do you fix piston slap?
This sound is RPM related. It starts out at lower RPMs Clack... Clack... Clack
and as the mph increase the sound changes to ClackClackClack. To the
point of sounding like rapped tapping at speeds greater than 65. Stop
acceleration and the sound goes away. *****
This sound is RPM related. It starts out at lower RPMs Clack... Clack... Clack
and as the mph increase the sound changes to ClackClackClack. To the
point of sounding like rapped tapping at speeds greater than 65. Stop
acceleration and the sound goes away. *****
The sound you are describing sound's like it could be a connecting rod bearing gone bad. I would suggest taking the motor to a mechanic that can hear the noise instead of trying to determine a clack over the internet.
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Posting Guru
Joined: Feb 2003
Posts: 1,226
Likes: 0
I had a 460 rebuilt, and the shop over honed one the holes, and I had that sound from that hole, I first thought it to be a bad lifter, till one day the piston came apart, you could see the top edges of the piston were rounded off, from running up and down the bore with too much play, is your motor rebuilt?like ranger429 said get a trained mechanic to give it a listen. I'm not saying thats what your problem is, just throwing ideas out there
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