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rod · 09-21-2012, 10:07 PM

my TRW pistons are old, bought new in 1968. i bought these for $39.00 for the set of 8 !!! this is the truth.
and yes, they did have pin oiling problems. i have since built a fixture to hold them and drilled them myself. i did contact the Tru-Arc tech, and .003" clearance between the lock ring and the groove is acceptable. doubling the locks does not double the clearance, it remains at .003". also the cold end play should be at 0", as Adger said. the piston will swell long before the pin does. [however that will remain to be seen, when i race at the new Lake Havasu City drag strip, where it regularly gets to 120 degrees!]
thanks for the replys, especially Adger and Reed.
rod in AZ

09-21-2012, 10:07 PM	#10
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 315 Likes: 0 Liked 20 Times in 15 Posts	Re: pin lock ? my TRW pistons are old, bought new in 1968. i bought these for $39.00 for the set of 8 !!! this is the truth. and yes, they did have pin oiling problems. i have since built a fixture to hold them and drilled them myself. i did contact the Tru-Arc tech, and .003" clearance between the lock ring and the groove is acceptable. doubling the locks does not double the clearance, it remains at .003". also the cold end play should be at 0", as Adger said. the piston will swell long before the pin does. [however that will remain to be seen, when i race at the new Lake Havasu City drag strip, where it regularly gets to 120 degrees!] thanks for the replys, especially Adger and Reed. rod in AZ