Specifications & Features:

Material

A356 Aluminum

Intake Port Volume

210cc

Intake seat size

2.08

Exhaust seat size

1.6

Intake Port Dimension

2.200" H x 1.310" W x 3/8 Radius

Intake Port Location

Stock

Exhaust Port Volume

80cc

Exhaust Port Dimension

1.420" H x 1.545" W

Exhaust Port Location

0.250" Raised

Combustion Chamber Size

65cc or 72cc

Valve Cover Bolt Pattern

Perimeter Bolt

Valve Angle

23°

Valve Spring Pocket Diameter

1.580" O.D

Max Valve Spring Pocket Machining

1.750" O.D

Warning: Do not machine spring pad any deeper.

Deck Thickness

.750"

Minimum Bore Diameter

4.000"

Flat Mill

.006" per cc 60cc Maximum

Angle Mill

.009" per cc 55cc Maximum

Note: Angle mills might require .120" Thick intake gasket.

Spark Plug Dimensions

14mm x .750" w/Gasket Seat