Tell me again about adjustable? stud rockers for EQ mag heads?

Abodybomber said

Used the Crane kit, with a Chevy 1.5 Chevy roller rockers, with a custom length push rod. Seems to work well, with a mild hyd.roller....

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Thanks guys for the replies. Now you say custom PR are you using OEM type cam and rollers? So changing the studs / rockers mandates custom PR length?