22R ------5.825 Rod
Alloy, 3.622 Bore, .8665 Pin, 3.504 Stroke, 1.375 Comp
Height, 8.932 Deck Height
60-9.2, 62-9.0, 82-7.3
pin. Bore size in
machined head and valve ports.
accumulator and mini groove technology.
United Engine relocated to Carson City, Nevada in 1978, where
it has continued to grow. Since it's move, United Engine has continued
to look at it's role in the domestic and world market. Currently,
UEM manufactures the Silvolite OE aftermarket piston line, KB Performance
Pistons (including the motorcycle division), and The Claimer Performance
Piston Series. United Engine and Machine Company is now enjoying
more than 80 years in business.
When you examine a piston you rarely examine the bottom of the
ring groove. Even if you looked at the grooves of the same style
pistons, seeing a difference without a micrometer would be difficult.
From manufacturer to manufacturer, however, there can be differences
in what is called the root groove diameter. The main difference
is in what is called compensated ring grooves. What is compensated
ring groove? Basically the root groove diameter is moved with the
oversize. For years manufacturers would supply the STD root groove
diameter for all oversizes. A .060 oversize piston would have the
STD root groove diameter. A compensated ring groove means the root
groove diameter would move with the oversize. A .060 oversize piston
has the root groove moved out .060. In addition, the ring manufacturers
compensate each oversize to match the piston, so there is no need
to worry about matching rings and pistons.By compensating the ring
grooves it cuts down the space between the back of the groove and
the ring. This cuts down on un-burnt fuel stored in this area.
In addition, compensated ring grooves make the land stronger, help
rings to seat sooner, and allow the top rim of the piston to run
All KB pistons are supplied with compensated ring grooves.
We have a complete line of racing pistons and rings
for import and more from wiseco,probe,srp,trw,venolia,mahle,ross,
speed pro, silvolite and keith black.