Working in cooperation with Allied Signal Inc. - the largest manufacturer of automotive spark plugs today - Unison has designed Autolite® Aviation Spark Plugs, specifically engineered to work as part of the complete Unison Ignition System.

Textron Lycoming Engines:
O-235, O-290, O-320, IO-320, LIO-320, AIO-320, O-360, LIO-360, O-435 GO-480, O-540, IO-540, TIO-540, LTIO-540, TIO-541, TIGO-541, IO-720

Teledyne Continental Motors (TCM):
A-65, A75, C85, C90, C-125, C145, E165, E185, 0-200, E225, IO-240, O-300 IO-346, IO-360,
O-470, LIO-520, IO-550, IO-550L

Specification and Reference Chart
Mount Thread Size	Reach	Shielding Thread	Gap	Autolite® by Unison PN	Price Per Plug
18MM	1/2"	5/8"-24	.016"-.021"	UREM38S	$54
18MM	1/2"	3/4"-20	.016"-.021"	URHB32S	$54
18MM	1/2"	5/8"-24	.016"-.021"	URHM38S	$54
18MM	1/2"	3/4"-20	.016"-.021"	UREB36S	$54
18MM	13/16"	3/4"-20	.016"-.021"	URHB36S	$54

When ordering:
Specify aircraft make, model and serial number along with engine make and model designation.