Part# 12-17611
ItemPart No.
Lycoming Angle Valve Bracket12-17611


The exhaust port resurfacing tool is designed to recondition port surfaces where no more than .010" of material need to be removed. It is easily bracketed and aligned to the port in reference to the rocker cover surface. Execution of the cutting operation only requires hand power. No air or electrical power is required. Mounting bracket adapters are available for the following engines: A & C series continentals, Lycoming Parallel Valve, Lycoming Angle Valve, others on request.
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This tool works perfectly for surfacing exhaust ports on most horizontally opposed air cooled aircraft engines. Pays for itself when you consider the alternative of having to remove cylinders for resurfacing of exhaust ports. Tool is very well constructed (made in USA) and should last for many years. Ive saved a substantial amount in labor costs just in two uses on both and Continental and Lycoming engines. The tool offers excellent control of material removal during the cutting operation. Definitely would buy again, but like I said, the tool is well constructed and will likely last a long time. Be sure to select the proper application mounting bracket for your particular engine. Price is for tool and set of cutter head inserts. You must add the appropriate bracket.

Mike C
January 24, 2020

Fast and does a good job, but at $600, needs some serious improvements. Tightening wheel began slipping immediately - cleaned up the glue and fixed with red Loctite®™- worked perfectly. Difficult to center on port - needs some kind of port plug to help center. Also flexed a little and cuts outside of port more than inside. Fix with single-sided razor blade between tool and adapter along outside edge of junction before tightening screws. TapFree® or similar cutting fluid essential to prevent clogging of cutters. Also a file card to clean them.

November 1, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Does the cylinder have to be removed or can I reface with it connected to engine?

No, the cylinder does not need to be removed. That is the unique aspect of this tool.

Q: When ordering individual tool, is each one complete with cutter and mounting system?

You must select appropriate mounting bracket for their application. Cutter head is sold with one set of cutter inserts and mounting bracket is sold separately.

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