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Just received my Moldstar 90. I am going to build the valve guides and valve seats out of this material in order to run titanium valves in Vivian's XRK Includes Full CNC Porting, Hand Blended Bowls, Bronze Valve Guides, Oversize Valve Seats, Competition Valve Job, Upgrade to MoldStar 90 Valve Seats.MoldStar®90 Wear Resistance against Coated Valve Seat Faces and Stems: The seats provide a surface for the valves to seal against when they close so . valve stem to guide clearance has a good deal to do with seat 27 Mar 2017 When the valves are closed, they have to seal tightly to prevent compression losses otherwise the engine will misfire and lose power. The valve seat must provide the proper hardness to seal without fault and thermal Following our product launch of the VR38DETT valve guides, we have now valve seat set using Moldstar® 90 high performance Beryllium-free Copper alloy. 30 Jun 2016 But the main job of a valve is to let air in and exhaust out of a cylinder. . such as Moldstar 90 and Moldstar 22 for valve guides and seats,” 3 Mar 2019 Valves Springs/spring seats/ reatainers/locks Valve guide seals Intake I'm using Moldstar 90 valve guide, which is an F1 type valve guide, (Moldstar®90 Valve Seats & Moldstar®22 Lifter Bushings) is an outstanding choice with a proven "track record" for both Lifter Bushings and Valve Guides. AHP Hardened PM Valve Guides (+$0.00); Moldstar90 Valve Guides (+$600.00) assemlby of cylinder heads with new viton valve seals and Tested/Approved