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12-point head design and a larger-than-stock shank diameter
The Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise
These rear-ends have a reputation for being tough to handle the abuse of Circle Track racing
CNC-machined from high-tensile billet steel for strength and precision
oil pan gaskets
1.440" Od. 1.050" Id. 7 Degree 11/32 Chromoly Steel Valve Spring Retainers 12-point head design and aSpeedmaster chromoly steel retainers are made from 4140 chromoly and then heat treated for long life. These retainers are available in a variety of lock angles and sizes to suit your needs, from performance street to competition use.
