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Elite Engineering · 08-21-2016, 09:29 AM

I started o read this thread thinking, "man this sucks", than I saw 8,000 RPM? There is no way to soin a LS engine much above 7,000 RPM before the valve train becomes so unstable that your lucky you did not drop all the valves.

Even a ProStock engine is limited to 10,000 RPM and there are $10's of thousands that go into the balance of every aspect of the rotating assembly alone much less the valvetrain. To go into more detail, the length of the valve stem and valve guides to be able to go above 7k RPM requires a billet cylinder head with so much meat allowing this aso the push rods are far shorter as well. The cam location is raised significantly from the LS location as well the accommodate this, and then the valves are a triple spring with inner dampener due to the amount of resonance and harmonics produced that have to be addressed. To correctly build a LS engine to turn 8k PM's I would imagine would approach $50k to be able to even survive reaching that high of spin, and all forged internals are not enough. The rev limiter is a tool to prevent catastrophic failure, and to raise it past 6,500-even 7,000 is asking for quick failure. These are not over head cam engines, these are still push rod technology that has been used for over 100 years!

A typical PS engine cost in excess of $100k to build. Please read this article to understand more of what I am sharing here. It is basically impossible to take a stock block, with stock cam location to safely spin to 8k RPM. The thickness of the push rods alone will not even fit a LS block, and lifters would have to be bores significantly larger and sleeved, spring open rates would need to be close to 800# (vs the few hundred for the average aftermarket cam available today, and today's cam lobe profiles would not allow it:

http://www.enginebuildermag.com/2011...ine-technology/

Your tuner should have NEVER even attempted this, and not knowing who it is, and with so many talented and knowledgable tuners out there I would say that was your biggest error, and it was costly. You should be enjoying your car today with the rev limiter set below 7k, but instead you have a pile of broken parts.

Wish you good luck in the future, but if you attempt this again, even with the best built LS based block as a platform, you will experience the same results trying to spin that high.

08-21-2016, 09:29 AM	#17
Elite Engineering Drives: 2010 Camaro Join Date: Nov 2009 Location: Denver Posts: 1,383	I started o read this thread thinking, "man this sucks", than I saw 8,000 RPM? There is no way to soin a LS engine much above 7,000 RPM before the valve train becomes so unstable that your lucky you did not drop all the valves. Even a ProStock engine is limited to 10,000 RPM and there are $10's of thousands that go into the balance of every aspect of the rotating assembly alone much less the valvetrain. To go into more detail, the length of the valve stem and valve guides to be able to go above 7k RPM requires a billet cylinder head with so much meat allowing this aso the push rods are far shorter as well. The cam location is raised significantly from the LS location as well the accommodate this, and then the valves are a triple spring with inner dampener due to the amount of resonance and harmonics produced that have to be addressed. To correctly build a LS engine to turn 8k PM's I would imagine would approach $50k to be able to even survive reaching that high of spin, and all forged internals are not enough. The rev limiter is a tool to prevent catastrophic failure, and to raise it past 6,500-even 7,000 is asking for quick failure. These are not over head cam engines, these are still push rod technology that has been used for over 100 years! A typical PS engine cost in excess of $100k to build. Please read this article to understand more of what I am sharing here. It is basically impossible to take a stock block, with stock cam location to safely spin to 8k RPM. The thickness of the push rods alone will not even fit a LS block, and lifters would have to be bores significantly larger and sleeved, spring open rates would need to be close to 800# (vs the few hundred for the average aftermarket cam available today, and today's cam lobe profiles would not allow it: http://www.enginebuildermag.com/2011...ine-technology/ Your tuner should have NEVER even attempted this, and not knowing who it is, and with so many talented and knowledgable tuners out there I would say that was your biggest error, and it was costly. You should be enjoying your car today with the rev limiter set below 7k, but instead you have a pile of broken parts. Wish you good luck in the future, but if you attempt this again, even with the best built LS based block as a platform, you will experience the same results trying to spin that high.