I measured deflection of the stud , just rolling the engine over by hand against spring pressure, it was eye opening. Now imagine the exhaust valve, that not only has to overcome spring pressure, but also has to overcome extremely high cylinder pressure to open.
Brad Smith told me a story years ago, had a big cube small bock dyno'd without girdles and then with, the engine picked up 20hp with the girdles, said if he hadn't seen it with own eye's he wouldn't believe it.
ThisIsLivin
07-12-2019 08:01 AM
After spending $15k on a motor, a couple hundy on a stud girdle helps me sleep at night.
