Stage 4 Head
If you're hauling a huge turbo around, the stock rev limiter just isn't going to cut it. For high revs, Stage 4 and above is where you need to be.
Like the Stage 3 head, you get a hot-tanked and pressure-checked head core, dressed with a "competition" valve job and stainless steel swirl-polished and undercut valves, with new valve stem seals and valve guides. The surface is decked and new exhaust manifold studs are included.
But where Stage 3 heads make do with stock springs and retainers, Stage 4 gets you Manley high-performance valve springs and titanium retainers.
Finally, because of the expected high-RPM use, Stage 4 port-work is even higher-flowing than Stage 3.
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