LF4/LF3 engines start to experience valve float around 6,000 rpm at high boost levels. This heavy duty performance valve spring kit is suited for high revving applications with OEM or the Mace Stage 1 higher duration camshafts, and completely eliminates all traces of valve float. These springs and retainers are drop in replacements are a drop in replacement that require no modification to the cylinder heads, and will reuse the stock valve stem seals. This kit includes an ovate wire, gas nitride treated beehive spring with light weight titanium retainers. OEM specifications are 56 to 61 pounds of seat pressure closed and 134 to 149 pounds open. These springs are rated at 90 lbs. seat pressure at installed height and 230 lbs. @ 0.500” maximum lift.
We recommend several special tools for your valve springs swap, all of which are readily available online.
- EN-48313 timing chain retention tool
- EN-39313 spark plug port adapter
- EN-46106 flywheel holding tool
- EN-46110 valve spring compressor tool