Used on all K&B 3.5 engines

Check your crankcase before ordering
Here are the differences

The early 3.5 which used a small sleeve with an outside diameter of .750" This means the hole in the crankcase where the sleeve slides in is 3/4" diameter.
We do not have replacement crankcases for .750 diameter sleeves.

Later crankcases used a .765 diameter sleeve. This is .015" larger. This the the only case we sell.

10-8901 Used on all outboards
and front intake engines.
Including early inboards and ducted fans.

10-8902 Used on ducted fan with drum valve intake.
Intake cutout is on the exhaust side.

Changes over the years

Sleeve bore changed from .750"Ø to .765"Ø

Added web to mounting lug.

Boss added behind screw holes
on exhaust flange.

Items usually purchased with this

29-8901 Gasket set
29-8911 Head Shim Set