Besides reconditioning the valve seats, there's work to be performed on the valves. We mentioned the 45-degree valve face, which seals against the seat, but there's more to it.

This tool cut all three valve-seat angles of 15/30/60 simultaneously and left a much cleaner seat surface. See All 8 Photos. All valves were cut on a Sioux valve-machining tool.

Exceptional Valve Seat Replacement For Peak Performance. Posted: February 28, 2025 | Last updated: July 10, 2025. Struggling with engine inefficiency?

Valve seats constitute only half of the flow picture; the other half concerns valves. They all might look the same, but the many high-perf valves on the market are a testament to how much ...

The variable-orifice MBV (VOMBV) measures the pressure drop across the throttling valve. As the VOMBV-style balancing valve is throttled, the flow is determined by measuring the pressure drop across ...

But aside from sealing, poppet valves don’t offer many advantages. Still, engineers kept pushing: better springs, VVT, and all kinds of breathing tricks: variable intake manifolds, forced induction, ...

When those valve seats got pounded to the point that they wore out, they had to be replaced with hardened valve seats. That’s the only kind you can get now.

BURSCHEID, Germany, Aug. 10, 2017 /PRNewswire/ -- Federal-Mogul Powertrain will debut new materials for valve seats and guides with improved thermal conductivity at the 2017 IAA Show in Frankfurt ...

WHEN refacing the valve seats of an automobile engine, it is usually the practice to make a reamer out of cast steel and temper and grind it to she. This is rather a tedious task and somewhat ...

However, the most telling clue came in the form of a tiny fragment: a piece of a valve seat – a known, if uncommon, issue in GM’s rectangle-port LS heads like the L92’s.

Often, valves don’t seal as designed. In fact, valve seats and discs can be damaged during the initial hours of operation and never work properly again.

These additives help prevent valve seat recession, especially important if you drive your classic regularly. Without it, long-term use of unleaded gas could eventually lead to valve damage.