Part# 08-11474
MFR Model# SA646985
Vendor Part NumberQuantityDescriptionPart Number


Uniform hardness all the way through the steel barrel walls which allows the barrel to provide even wear while withstanding extreme cylinder temperatures and pressures.

Exhaust and intake ports are volumetrically matched to maximum output and performance.

Increased port wall thickness - eliminates problems with warping and cracking.

Computer-generated head fin configuration - deliver more uniform heat transfer and fewer "hot" spots.

Manufactured from the most advanced alloys available - exceed industry standard for strength and porosity.

+ Included with stud assembly.
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WARNING: Cancer and Reproductive Harm -


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very helpful staff

Todd S
August 3, 2020

they are all flat and round lol

Dwain H
March 7, 2020

The Roto Coil Was Well Made and fit correctly

John R
July 20, 2019

Superior products are...Superior

Gerald W
December 31, 2018

I got this just incase I tore the other valve cover gasket. (SA534857). Turned out it was the same one I had already on the valve cover. I thought it was the cheap cork, this was a nice gasket. For $2.66 it was well worth it.

Frank D
November 17, 2017

It arrived on time and was complete package to replace the cylinder on my 310

Martin G
February 24, 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: What is the difference between 630979-9 and SA630979-9 ? If it is a matter of manufacturer, then does the maker of SA630979-9 have PMA with TCM?

Yes, the difference is the manufacturer. Yes, the manufacturer of SA30979-9 has FAA-PMA approval as a replacement for 630979-9.

Q: Does the Stud Assembly PN : 08-11100 include the complete kit such as cylinder, valves, piston and rings, gaskets etc?

Yes that is correct.

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