Rocker question
Thread Starter
Staging Lane
Joined: Oct 2007
Posts: 77
Likes: 0
From: Texas
Rocker question A friend of mine gave me some 1.75 roller rockers he was going too use on his car but he sold it. On a stock c5 Z06 will this result in a valve to pistion interferance? Or will it not result in anything at all?
Dave
Dave
Dont do it. A z06 runs sodium filled valves. They are weaker you'd probably run a better chance of breaking one if you didnt set up the wipe pattern perfectly. Also it would be advised to upgrade your springs. I wouldnt imagine you would see any real gains but would open a few new potential risks. I'm running the stock rockers with a .651 lift cam. They are very strong, just heavy.
Thread Starter
Staging Lane
Joined: Oct 2007
Posts: 77
Likes: 0
From: Texas
Were would you see breakage? Would it be on the valve end due to impact loads? Or would it be a separated valve end? And are you referring too the fact that they are full roller rockers or the slight increase in ratio (.5) as a problem? Thanks for you input it is greatly appreciated.
Dave
Dave
I currently run Crane 1.8 rockers on my 03 Z06. I ran them for 2.5 years on the stock top end with no detrimental effects. I'm still running them, but with a new cam and top end configuration. The car is my daily driver and I participate in 3 - 4 open track events a year so the car is driven hard.
The Crane rockers are heavier than the stock rockers and a nice set of valve springs is always a good addition. One negative aspect of the stock rockers that not many mention is the low actual rocker ratio. The stock rockers have a variable ratio from 1.4 to 1.7. They only see 1.7 for a very minute amount engine rotation time.
All that said, you shouldn't have any issues running 1.75 ratio rockers on your car. You won't see much a power increase so don't get your hopes too high. When changing any valvetrain part, ensure it is properly set up for YOUR application.
The Crane rockers are heavier than the stock rockers and a nice set of valve springs is always a good addition. One negative aspect of the stock rockers that not many mention is the low actual rocker ratio. The stock rockers have a variable ratio from 1.4 to 1.7. They only see 1.7 for a very minute amount engine rotation time.
All that said, you shouldn't have any issues running 1.75 ratio rockers on your car. You won't see much a power increase so don't get your hopes too high. When changing any valvetrain part, ensure it is properly set up for YOUR application.
