Thread: 390 Valve Upgrade?

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Hardened seats are part of the build. Looks to be stainless is the best way to go for a hot street set up. Thanks for the replay!

Originally Posted by Parts-Geek

Hardened seats are part of the build. Looks to be stainless is the best way to go for a hot street set up. Thanks for the replay!

most of the stock EX valves are going to be a grade of stain less steel . parts should not to hard to get over all on them valves look like 5.435 and 5.450 with a 330 tip your machine shop that is doing the head work can get the valves for you .when i build heads i like to get the valve s most of the time. one thing i will add here is on the 390 heads putting hard seats in needs to be watch heads can get screwed up very ez