Atwood Performance has gone through a lot of research to try and put together the best components that go into any of our cylinder heads. Advanced Valves & Valvetrain are on the cutting edge of the newest developments for the Harley Davidson valvetrain and this is why Atwood Performance relies on them.

AV&V valves are available in both chrome and black nitrided.

Atwood Performance uses the high performance guides that have improved shape and better clearance for high lift applications.

 All AV&V springs are made from the finest spring wire on the market. A high silicon and vanadium alloy. This is the best material available for high lift and endurance applications.

This is a picture of the AV&V 10 degree jumbo locks used by Atwood Performance on the right and stock Harley Davivson locks on the left. At .600" lift and 400# spring pressures, which locks would you want holding your retainers to their respective valve tip?

This photo shows a comparrison between the Atwood Performance AV&V bronze guides vs. a set of stock Harley Davidson valve guides. The switch to manganese bronze allows for tighter clearances, greater oil control, and better heat dissipation.

These are the AV&V viton seals used by Atwood Performance. They resist higher temperatures and offer superior sealing over standard seals.