Appears to me the po used a incorrect sized bolt. Length wise. I bought it along time ago, po had just done the pan gasket, but pulled the pulley
The bolt that's in the pulled is only .75" long. I think the factory crank bolt would be longer? If you look you can see where the bolt stops and there is still tons of thread area..about .75" more between the piece of crank on the pulley and the rest left in the motor. Russ said the crank bolt was around 1.25" or so but didn't. Have an exact number on hand. Sounds about right to me..bolt areas t be .75" long plus the other .5-.75 of unused threads would equal around 1.25-1.5" long.
It was a huge spark show, a nasty pop and then a airplane sound. When the pulley snapped, it snapped the serp. belt. That intern spun the idler pulley insanely fast..it was screaming(air plane sound) that's how fast it was going. Scared me something fierce.
I'm so extremely happy that it didn't hit anyone or damage anything. How it skipped 3 lanes of cars and stopped about 1/4 mile away without touching anything ill never know. When I saw the crank pulley gone first thing I did was look around to see if anyone had stopped or was hurt. That thing was like a missile I'm sure. It gouged the asphalt a good .5" deep for where it hit.
If the cause was incorrect length of bolt then its last the 6 years I owned it. I've pushed her to 5000rpm a few times running stop-stop light...hey it's a 5speed and that's silly ricers need a lesson

but I would say that's like 1 time out of 100 days or something. Not often at all! I do know the harmonics issue could of been a cause. Idk what the reason is, just very scary.
Will be working with Russ to get a cam setup that won't turn anymore power past 4700rpm max. Cause I do not want to be tempted to run any higher EVER!