I'm doing the PT lifter mod on my Daytona (with a 89 turbo ll engine). I did it more for quietness than a performance upgrade (but I'll take the performance too!).
Anyhow can anyone tell me what's the distance between the beer cap part of the lifter to the bottom of the rocker arm is usually? I've read you should shim the PT lifter up .125 of a inch which I have done. But due to the machining tolerance of the head you may want to correct this tolerance when doing the PT lifter mod.