Why we no longer work with used Type 4 Cylinderheads.
The Hot Head Pressure Testing Myth
A brief debunking of a common misconception about water cooled cylinder head cracks.
Porsche 987/997 Valve Seat Issues
This problem of intake valve seats dropping has struck quite a few owners over the past few years. We first became aware of it with
A Tale Of Three Heads:The 3.4l Porsche Lineage M96,M97,9A1
I originally published this article in 2012. Though I’ve made major advancements in certain areas with all three of these heads, the basic info here
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