Toploader wrote:

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Maybe he advanced his timing too much

#dammitboy

Sure hate to see that. Did a fuel line burst on a hot engine?

And that is why I carry a big fire extinguisher.

Alan wrote:

Wasn't a bearing failure this time?
That sucks. Did it  happen on the long trip home?
 

 
Nope, front wheel bearings survived, and the trip went fine other than new coil, starter, and a condenser failing. The piston damage was all due to my head mechanic's loft. Lack of freaking talent.

Prior to the mini bash I was fighting what I thought was a carburetor problem, so I swapped to an older Speed Demon 750. After the coil and condenser were changed on separate occasions, she ran great. The day after returning home I swapped back to my Quick Fuel 670. However, I failed to plug a timed vacuum ports on the carb, aaand I failed to limit the total advance on the Mallory dual point distributor I recently installed. So I'm sure the total timing was really high, like we'll over 40. Ya, I know. So, when I took her for a spin around the block and really got on it, she sounded real real nice, until she didn't. All kinds of racket was coming from the motor, and the AFR O2 gauge was well above 17 when I looked at it.

I had actually swapped 3 different carbs prior to my trip, and the AFR numbers were good. ~13 at idle,  ~12.5 on full throttle, ~15 at highway cruise. I'd also checked the spark plugs and piston tops several times for detonation but didn't see any evidence. They both sure show signs of it now 😁

I'm still working on pulling the motor, but from what I've seen with a bore scope, the cylinder walls look fine. So I figure I'll clean it up, ball hone the cylinders, check bearings and change if needed, new pistons and rings.

Education is not free.

Many years ago my sister had a 66 Mustang, 289 2-bbl, as I was starting it one day, I smelt gas, opened the hood and found the gas hose at the carburetor was leaking and shooting gas directly on the distributor cap.  No fire, but sure could have been one. 
 

Bearing Bob wrote:

Alan wrote:

Wasn't a bearing failure this time?
That sucks. Did it  happen on the long trip home?
 

 
Nope, front wheel bearings survived, and the trip went fine other than new coil, starter, and a condenser failing. The piston damage was all due to my head mechanic's loft. Lack of freaking talent.

Prior to the mini bash I was fighting what I thought was a carburetor problem, so I swapped to an older Speed Demon 750. After the coil and condenser were changed on separate occasions, she ran great. The day after returning home I swapped back to my Quick Fuel 670. However, I failed to plug a timed vacuum ports on the carb, aaand I failed to limit the total advance on the Mallory dual point distributor I recently installed. So I'm sure the total timing was really high, like we'll over 40. Ya, I know. So, when I took her for a spin around the block and really got on it, she sounded real real nice, until she didn't. All kinds of racket was coming from the motor, and the AFR O2 gauge was well above 17 when I looked at it.

I had actually swapped 3 different carbs prior to my trip, and the AFR numbers were good. ~13 at idle, ~12.5 on full throttle, ~15 at highway cruise. I'd also checked the spark plugs and piston tops several times for detonation but didn't see any evidence. They both sure show signs of it now 😁

I'm still working on pulling the motor, but from what I've seen with a bore scope, the cylinder walls look fine. So I figure I'll clean it up, ball hone the cylinders, check bearings and change if needed, new pistons and rings.

Education is not free.

Keep us posted on the teardown and build. I'm interested in seeing if the rod bearings took a hit also. Detonation is hard on parts as your know to well. 

I've been aware of damage that can be caused by detonation, but it's good info to post. Been doing honey do's and not much on the Moostang, but I'll keep ya updated when sumpin happens.

I thought that too John. I'm thinking the area where the fly cut is located probably had the thinnest amount of material. I plan on checking that when I pull the pistons. The new pistons fly cut looks pretty similar to my work. Only the intake valves needed the flycut. I don't know who much the carbon build up increased the cr.