Here are some recent testing that we had undertaken on our 1.9:1 ratio rockers to suit LS1's. As you can see as a genuine bolt on item they certainly work, with no loss anywhere in the rev range only gains

Here is what
Grant @ Custom Tuning had to say about the item...
"Hey Steve,
We'll I have a definitive answer for you, with rockers 253.9 rwKw, with standard rockers & all exact same conditions 241.9 rwKW!
So In summary an extra 12 Kw, extra 20 Nm of torque, rev's out & hold's the power for an extra few hundred RPM all this at no extra weight as there designed from the standard rocker weight & design!
There is a brief dyno log of stuff to show in excel & the dyno jpg shot's!
Cheers Grant @ Custom Tuning!"
Cheers
Steve
