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I had torque converter bolts that were just a little bit too long. No clue how that happened. Had some noise whenever car was idling. don't remember noise while driving at any speed or any vibration, just a mild ticking. Broke two flexplates before noticing the bolts were tight, but not clamping down enough to the flexplate due to bottoming out in the torque converter. They tightened enough that it wasn't visibly apparent.

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Originally posted by ski_dwn_it:
Are the straps accounted for on your diaper? Last year I was doing an oil change and found some "hair like" fibers in my filter. While cleaning the car underneath I found the excess strapping from the belts that hold the diaper came loose and want up between the flywheel and motor. To my shock the strap got pulled into the motor thru the rear main seal! I tried to pull it out and it stopped after about 2inches of strap getting retrieved. Fear of pulling the main seal out, I cut the strap and ran the remainder of the season. On the off season I pulled the motor. about 3 inches remained inside.

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Do you have slip on collectors and maybe have a tube rattling in the collector?

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I had a pebble in a center cap make that noise before. I would only hear it at slow speed.

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Originally posted by markemark:

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Do you have slip on collectors and maybe have a tube rattling in the collector?

My collectors are welded to these mufflers that have a straight thru baffle. This baffle has come loose slightly in the past but the bend I put on the ends have made them tight. I always check them after a racing weekend.

The collectors slip onto the header tubes. Because I use an O2 sensor I want the tubes sealed tight and use hi temp silicone on the collector openings and sliding the tubes in seals extremely well. When one tries to pull them apart it takes a sincere effort. I then wrap the tubes to the collector with exhaust wrap and they remain tight not moving, no leaks. Been doing this for 5 years.
Well there goes that thought

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Originally posted by inferno camaro:
I had a rattle I chased half a season, ended up being the outside of the harmonic balancer was loose and spinning around the center portion.

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...the outside of the harmonic balancer was loose and spinning around the center portion.

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Originally posted by FootbrakeJim:
Seeing a lot of worthwhile things to look at in the comments.
Markemark, I hope you have success this weekend, and figure out the cause of the noise.

Ski, we have all seen or heard of some wild stuff happening with race cars, but you win this week's prize for the most bizarre occurrence yet! You probably couldn't make that happen again if you tried!

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Originally posted by ski_dwn_it:
Are the straps accounted for on your diaper? Last year I was doing an oil change and found some "hair like" fibers in my filter. While cleaning the car underneath I found the excess strapping from the belts that hold the diaper came loose and want up between the flywheel and motor. To my shock the strap got pulled into the motor thru the rear main seal! I tried to pull it out and it stopped after about 2inches of strap getting retrieved. Fear of pulling the main seal out, I cut the strap and ran the remainder of the season. On the off season I pulled the motor. about 3 inches remained inside.