Can anyone recommend a set of rings for a 3.905 bore? The machinist power honing an LS1 block for me to 3.905" recommends a ring set with a "Napier" type second ring and not a "barrel" faced type (Mahle) a "hook" style ring over a standard style for...get this, better oil control. I never new compression rings could help oil control so this is news. According to the machinist, GM recommended the Napier ring to help with pre mature oil burning. I am going to use JE fordged pistons in this app. Anyone have any info/experience with this? Thanks.

 

You can Google search the benefits of the napier cut! What thicknesses do you need on these rings?

 

Mahle makes a very affordable steel top w/ napier second ring set in a 1.5/1.5/3.0 size. The napier second ring was one of the improvements made on the 405hp 2002 LS6. Generally you have a barrel top and a reverse taper second. The napier replaces the reverse twist to improve oil control and reduce friction.

 

Thanks for that, would you know the part for this ring set?

 

1.5, 1.5 and 3.0mm, thanks