BC offers XPTurbo cylinder jugs that have been hopped up with copper o-rings and .500" dowels that mate to the cylinder head to keep both from shifting at high boost levels. We choose the XPT cylinders because of the closed deck design and the fact that they're +.050" taller deck height. This adds rigidity and support to the cylinders as well as delivering less piston side loading with an optimal compression height design piston. BC offers a stock 93mm bore cylinder and a +1mm overbore (94mm) that has been re-Nikasil plated. BC also offers the 98mm bore K&T cylinder jug in the closed desk XPT casting with o-ringed cylinders but without the dowel pinning (subject to availability).
Part #
Description #
Sizing
Buy Kit
Status
BC9090
CYLINDER JUG ASSEMBLY - XP Turbo Closed Deck Design (#3023035) w/Copper O-Rings, Dowel Pins
93mm
In-Stock
BC9091
CYLINDER JUG ASSEMBLY - XP Turbo Closed Deck Design (#3023035) w/Copper O-Rings, Dowel Pins
94mm
In-Stock
BC9092
CYLINDER JUG ASSEMBLY - XP Turbo Closed Deck Design (K&T Perf) w/Copper O-Rings, no Dowel Pins
98mm
In-Stock
Note: BC9090 and BC9091 require BC/Cometic head gasket part number BC8290-5 that has the .500" alignment holes cutout for the custom dowels. Use BC8291 head gasket for BC9092 (K&T) cylinder.
Copper O-Rings with .012" protrusion are inserted around the cylinder bores to contain combustion.
Four hollow dowels (.500' O.D.) around the perimeter keep the head from shifting at high boost.
The factory Polaris dowels are only .230" O.D. and are adequate only to about 250whp before shifting.
BC uses only the XPTurbo cylinders because of its closed deck design and taller deck height.
WARNING: This product can expose you to chemicals,
including Chromium (hexavalent compounds), lead and lead
compounds, which are known to the State of California to
cause cancer, birth defects or other reproductive harm. For
more information, visit www.p65warnings.ca.gov
TURBO / COOLING
