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Adger Smith · 09-09-2011, 10:55 AM

Rod,
Do you have one of the original Tru Arc lock rings. TRW used several different thickness rings in the .927 diameter. If they are the .042 thick there are spiral locks that are a single that make a good up grade replacement.If they are the double .042 you can use a double spiral lock as an upgrade.
I think there is a F/M number that supercedes the TRW number. When I get back to the shop in a couple of days I'll check it out for you.. It is my opinion that the spiral locks are always better than Tru Arcs and should be used if possible. The only negative is the blood you shed taking spital locks out. Tru arcs are just easier to install and remove.

09-09-2011, 10:55 AM	#3
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: piston lock rings? Rod, Do you have one of the original Tru Arc lock rings. TRW used several different thickness rings in the .927 diameter. If they are the .042 thick there are spiral locks that are a single that make a good up grade replacement.If they are the double .042 you can use a double spiral lock as an upgrade. I think there is a F/M number that supercedes the TRW number. When I get back to the shop in a couple of days I'll check it out for you.. It is my opinion that the spiral locks are always better than Tru Arcs and should be used if possible. The only negative is the blood you shed taking spital locks out. Tru arcs are just easier to install and remove. __________________ Adger Smith (Former SS)