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Brian Tooley Racing (BTR) Solid Ring Compressor. Rather than relying on the piston skirt to locate the pistons as they're being inserted into the block like one-piece tapered ring compressors currently on the market, the new BTR ring compressors have a small but very important reverse chamfer at the bottom that fits into the chamfer at the top of the block which serves two functions.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.