2014/2015 z/28

[napa68]

Originally Posted by GotGrunt

Does the LS7 Z28 have the same cylinder head valve guide issue as the C6 Z06, where it was dropping valves and grenading engines?

I believe that was fixed by 2009 in the Corvette's. I had one of these for a short period of time. What a killer purpose built car!

[juliosz]

You are 100% correct Tim!

[GotGrunt]

Originally Posted by napa68

I believe that was fixed by 2009 in the Corvette's. I had one of these for a short period of time. What a killer purpose built car!

GM claimed to have addressed the issue for the 2011 LS7 but there have been failures on engines built after their “fix” date. I don’t think it was ever resolved for the Corvette owners. I bought a C6 Z06 brand new, sold it with 30k miles a few years later. I kept in touch with the next owner who told me a couple of years into his ownership, the car dropped a valve and destroyed the motor. It also happened to a close buddy of mine during his leisurely commute to work, he said he was at an intersection making a left turn and the car just died. It’s not a cheap fix after it drops a valve!

I just wasn’t sure if there were any reported engine failures on the Z28 as so few were built.

[Andy]

Thanks everyone for the feedback. I agree on the valve issue. Everything I've read clearly stated that if I get a GM vehicle with an LS7 that replacing the heads should be the first thing that I do to prevent dropping a valve. I would likely do a cam at the same time. I've seen heads/cam/intake/exhaust on these cars make 600+ rwhp. I think that would be a blast in a car that is pretty much a purpose-built racecar from the factory. The car in the video link below made 632 rwhp.

https://www.youtube.com/watch?v=6FYo46tz3OE