Part# 08-11812
MFR Model# SL65441
Vendor Part NumberQuantity NeededDescriptionPart Number
SL654411Valve Spring Seat08-11812


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.



The pin (& caps) were a perfect fit and came packaged with a light coating of wax and wrapped in wax paper it was completely protected from the elements!

Paul A
January 25, 2021

SUPER fast delivery, Superior quality. I give number one.

Ales B
January 5, 2021

Well packed, exactly what I asked for, high quality parts, very nice looking. They arrived rapidly as expected.

Kevin F
April 23, 2020

no problems OEM quality

Roger P
April 23, 2020

Parts arrived on time and with no damage. Aircraft Spruce is awesome !! Thanks, Matt

December 6, 2019

Intake gasket SL71973 a good replacement for Lycoming gasket 71973, my mechanic and IA recommended it. The gaskets are working for me. A one time use gasket.

David P
October 8, 2019

Exactly what I ordered. Quick delivery.

Mel N
August 14, 2019

My first cylinder install and went very well, though, I recommend buying new nuts along with the cylinder purchase. Difficulty installing rocker arms transferred over from old piston, but prevailed. Insure you have Manufacturers Overhaul manual in your mind before doing and have available.

Chinookflight L
October 9, 2018

This item looks es expected, nothing specil to coment

Pilatus A
March 6, 2017

We were sent the wrong rings. Gave the model number of the engine and what material the cyl was made of. They told us what rings we needed.

August 14, 2020


Please note, Aircraft Spruce Canada'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 Canada 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 Millennium cylinder assembly SL36006W-A20P, your part number 08-11749, come with the piston and ring?

Yes, this assembly comes with the piston and ring.

Q: What material is this Superior air parts SL75906 Lycoming rocker box gasket made of Cork or Silicone? I need silicone type. What part no. for order?

It is cork. We have them in silicone, part number 08-01314.