Racingswh

Interesting. I hadn't heard that before. Thank you.

For us that's no time at all. 4 hours per event of track time by a single driver and just 5 events per season then almost every season you would need a new motor. Makes sense to go with the RHS blocks.

This will be next for my Wife's car.

Z06Ronald

Jason, has it become clear what happened first? Water in the catch can (e.g. due to a faulty gasket somewhere) that caused the block to crack, or was it the block that cracked first causing water to escape?

Katech_Zach

Cracked block leaking water. It was a small amount in the catch can and Jim caught it right away.

RamAir972003

I'm sorry didn't make my question clear the heads that were out of spec where they stock heads....

Katech_Zach

yes


.

Dirty Howie

Does GM know that the stock block is only good for 20 hours of track duty?

Their chief engineer recently confirmed that GM warranties these motor for track use !!!!!!!!!!!!!!


DH

Katech_Zach

18-24 hours at 600+ hp.

At 505hp it's not an issue. GM is racing stock LS7 blocks in the Continental Series GS Camaro Z28s.

RamAir972003

So basically warranty should not be denied if you track a stock z and z28...correct..

Katech_Zach

I wouldn't think so.

RX-Ben

Cracked sleeve or something else?

Painrace

Sorry guys. It was a long trip home with the cops stopping me in Kentucky for side swiping a motor coach. They had me wait until the guy drove to us. All I had was a black mark on the RR of my trailer. When the guy finally showed up he had a tiny little scratch on his mirror! He then told the cops a truck beside him blew him into my trailer. It was such a small touch I never felt it. The coach driver called 911 and told the cops I side swiped him. Cops were great and after a delay all went on our way and the cops apologized.

The engine had about 22 track hours on it. I attend a lot of track events to give back to a sport that has given me so much. I don't take my car on track much. I am usually in others cars or providing information. I love wheel to wheel and do the HPDE to give back.

I noticed coolant going down and checked the ARE vent can. It had 2/3 oil and 1/3 coolant. Those situations don't get better. All gauges and temps were fine. It is smart to raise the hood after going on track and just take a quick look around. I still have a lot of very good parts from the old engine.

Thanks, Jason and Katech. One more fine job!

Jim

Katech_Zach

Yes, cracked sleeve.

Painrace

How are you, Ron. Going to Track Attack, I hope?

Jim

dapopa9

Wow that's and interesting note to be aware of. I think I should just buy a C7 Z06 after reading that.

Tnacdrmr

Congrats on your new build. Impressive #

Z06 1of38

Could you please pm me a price for a project like this? I'm only 3 hours from you.

Thanks.

MTIRC6Z

Hey Jason, I presume there were at least a few cracked pistons as well?

Also was wondering about the change is connecting rod, is that done strictly for reliability purposes or is it more related to a length issue?

Have you seen many titanium rod failures as of now?

Cheers, Paul.

Katech_Zach

No cracked pistons.

We have not yet failed a Ti rod to date. Our Track Attack packages have steel rods by default, but not due to any reliability issues.

MTIRC6Z

Interesting, as always, thanks for the info...you guys are the best

Cheers, Paul.

Michael_D

Interesting to hear you guys are seeing sleeve failures at the power level you noted. I know that detonation is a killer, but continued high rpm use is somewhat of a surprise to me, even at the 650 flywheel hp range. What do you think is causing this to occur? Is there a particular problem cylinder, or area of the bore that is failing?