Two! Two cracked pistons, ah ah ahhh.
 

Vette had too much blowby. Did a compression test, zero in the number 7 cylinder! So I pulled the head off and this is what I found.



Oopsie Daisie. Guess 13lbs of boost is just too much on 91 octane! Regardless of how much timing I pull and how rich I tune it under boost. Time to order that intercooler and mandrel pipe kit!!! I'll clean off the melted aluminum tomorrow, and decide whether or not the cylinder is ok. If so, I'll just order another piston and throw it in there. Cylinder head was fine this time. If not, I might bore it 60 over and go with some low compression pistons. I really don't feel like pulling the motor though.


My Jeep is coming via semi-truck tonight or tomorrow. I've seriously been considering putting a junkyard 350 in the Vette with a 5 speed, selling it, buying a 1st gen Camaro caged and tubbed less drivetrain. And dropping the Procharged stroker in it with the 6 speed. It would be easy to tow it around, and I could turn up the boost, run race gas and actually get traction.

PS, Glenn or Ron, if you're out there. Does the dot on the ring face up towards the sky or down towards the ground? I forget.

Wow, that sucks. Buy a 1st gen Camaro and don't look back.

:drool2::drool2::drool2:

towards the sky bro

Thanks G money splooge fest. :beer:

Ouch. :(

Keep the Vette, yours is one of my favorite body styles.

Jerry's correct. What's your static compression? You can run 13psi you just have to pull a lot of timing out. I'm running 12psi but I only have 15 degrees total. The damage is caused by detonation. That's what the Cobra's stock pistons that broke from detonation looked like. Are you using a boost retard ignition box?

I've pulled 12 degrees total from stock. Intercooler is the answer. 9:1 comrpession. Recommended 9-10 lbs hot air. 19 intercooled.

13 intercooled should be a walk in the park.