I did my research on here for tapered ring compressors. And i plan to get the Weisco 81.5mm compressor. My small quick question is, what size do i get? I went online to summitracing.com and found two kinds. One with an 81.5mm, but it says minimum bore size and max bore size. Thats where i get confused. My best guess would be the 81.5mm as the minimun bore size. I just dont wanna choose the wrong one.

 

Some are adjustable with a hose clamp to adjust size. Then there's the one size only with no hose clamp.

 

This is a little costly, but I have the wiseco compressers sizes ranging from 81 to 82 mm and 84 to 85 mm. I tried the adjustable once with a bad result. If your block has a 81.5 mm bore and hone then get that size.

The tapered sleeve makes it very easy to install a piston.

 

The tapered piston ring compressors made by ARP and Wiseco are easy to use and practically foolproof. Just order the size that matches your bore size.