Quote:
Originally Posted by BoxsterGT
Whatever source they are from, more & more of recent ones are out of spec. Perhaps its time to contact ARP or Raceware.
Len
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ARP was founded by a couple of aerospace engineers that had to deal with aerospace bolts and were not happy with automotive aftermarket bolts back in the day. I worked on a thread rolling machine years ago for ARP and the specs were very tight. However, does ARP or Raceware make the insert sets? ARP or Raceware have just the studs because that is their business of bolts/studs. Case Savers seem to be the way to go because Case Savers have enough thread shear area to hold their ground even though the piston oiler passage is close. Magnesium tends to be brittle and coarse threads may be better here. I use buttress threads on my live line tool's plastic threads operating at cryogenic temps(to get shear area on plastic). Coarse threads make sense to me here with brittle or soft base material. Case Savers require an experienced machine shop but that is a good thing in the long run of reliability & shop warranty. You can always get some thread micrometers and/or thread wire attachments for your micrometers to measure the Case Saver inserts. Measuring threads is not a fun job especially if the threads are tapered (PITA-been there done that). Select the best & return the rest after measuring or maybe just call Ollie's in Lake Havasu, AZ? I am waiting to see the country of origin too!! Best of luck to you Len.