Most of those valve failures are heat related cracks in the bakelite valve body. I fab a heat shield to keep away radiant heat from the exhaust manifold.
[Linked Image]
[Linked Image]

Last edited by 72roadrunnergtx; 09/10/20 04:11 PM.
1972 Road Runner GTX 440 6bbl 5-speed
[img]http://72rrgtx.com/carpics/bucket/DSC06730r-1.jpg[/img]