Along with Comp's serious-duty triple springs, we added their line of titanium retainers and 1.7:1 aluminum shaft rockers. These full roller arms are just what we needed for valvetrain stability in the upper rpm range. If you're using factory valve covers, you will have to modify them slightly to fit. We're planning to reuse our Moroso sheetmetal valve covers and they cleared without any fitment issues.
Our biggest change was modifying the Trick Flow 235cc cylinder heads by swapping out the 2.08-inch valves for larger 2.10-inch valves from Si Valves. While we wanted to improve the already impressive flow figures, the 2.10 valve on the intake side also added 0.070 install height, allowing us to properly match the necessary Comp 947 triple valvesprings for the aggressive solid roller camshaft. We did the same on the exhaust side, but maintained the 1.60-inch diameter valve.