Pr3 with .25 overbore

 
Old 01-31-2018, 12:37 AM
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Default Pr3 with .25 overbore

Hey guys so yesterday i went to my machinest to bring him some p73 Pistons I planned on using in my b18a block with GSR head. Originally what was in the block were some pr3 s usdm manufactured however after measuring the bore of the piston if that the pr3 .25 oversized and after the closer look handsome cleaning up the skirts we did in fact find a a .25 mm marking later on in the conversation I didn't hear him say that I had 81.5 millimeter for then in the block I was using. Now I'm not sure if he misspoke or if I'm not understanding but when it my board then be that 81.25 for my block or is the 81 5 to compensate for my ring Gap or do I need 81.5 Pistons. My first instinct would be to go with 81.25 mm piston just based off the markings that were on top of the pr3 however by the way those Pistons look after pulling them out of the block I also was able to justify the thought process that they possibly could have been .25 too small so I guess my question to you all is if I have a .25 marking my Pistons does that mean that I need 81.25 replacement Pistons and also is my bore size 81.25 or 81.5. Just to add I am in a little bit of a hurry to get this build put together being as it's going to be my daily I am running a B18 A1 block with a b18c one head stage 2 Brian Crower cams supertech Springs in valves and once the break-in period of the head is over will be putting on a 54 trim Borg Warner Turbo and want to run roughly 11 to 12 lb as a daily lsv and either way I'm guessing my p73 ITR Pistons aren't going either way correct? Any suggestions on what Pistons to use for my Turbo build 4 him put on suggestions for the build would be appreciated
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Old 01-31-2018, 12:39 AM
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Default Re: Pr3 with .25 overbore

I forgot to mention that I was bringing the 73 Pistons to be pressed onto my LS rods after shaving 1mm off each side

Last edited by Hit the G Swap; 01-31-2018 at 12:54 AM. Reason: Forgot to add I was also getting rods shaved
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