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What is the difference between the solid bar type and the spring loaded versions?
Also while I'm at it, I have a 383 (450-500hp) .540 lift cam does my engine warrant using these? Just to make sure.
...I plan to hit it with a 150 shot in the future.
With either type the girdle holds the lash adjustment in place, so when you loosen them to adjust your lash you loosen more then one rocker, which can make adjustments a pain.
Check out MOROSO PN 67050 for 3/8 stud or PN 67070 fo 7/16 stud, they are inexpensive and allow you to loosen one rocker at a time.