Buick 300 severe detonation

T

tommyboy

Member
Hello,
I have a very bad situation that has just developed in my newly rebuilt 1964 buick 300.
At first it ran great, and I thought I did a good job of breaking her in .
When I start it , it sounds like piston slap and maybe detonation.
As I raise the rpm all the clatter goes away until it gets to idle then it clatters real bad and quits.
Also seems to overheat real quick, I think I know what is wrong I am just scared to find out.
When I put it in gear it clatters very loudly and dies.
Timing is set at 4 degrees before tdc
can any one help.

Tom
 
That doesn't sound like detonation to me. What is the oil pressure like? Sounds like engine noise from lack of oiling.

Timing has nothing to do with it.

Looking at your break in thread, it doesn't sound like you broke the cam in. It may be going flat now.
 
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