Valve Spring Recommendation
I running a built 4.6 with a Vortech @ 15psi. When I built the engine I installed the Trick Flow FMOD Track Heat Spring Upgrade Kit TFS-2500525. The instructions state that they support up to .580” of lift and have a seat pressure of 15psi. They also state to install the supplied .030” shim under the spring when installing in PI heads instead of Trick Flow heads.
I installed upgraded camshafts from Comp Cams XE270AH with .550 lift to MHS Stage 2 Blower Cams with .575” lift and ran into a problem. I think the valve springs are binding with the increased lift. I suspect with the shim the max lift the is actually .550” (.580 - .030).
I'm going to either remove the shim under the TFS springs or install new valve springs. I tried multiple times calling and emailing trick flow and have yet to reach anyone. Hopefully someone here can help out.