RR
They are fairly easy to install and you can get instructions from Crane's website.
The Crane RR are the ones that Ford used on the 93 Cobras.
You will not notice any major power improvements. It will reduce wear and friction. We did not need any shims when doing the install on a 92 coupe. Depends on the condition of your valvetrain. They will come with the shims anyway.
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You're gonna need your seatbelt
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