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FEELING LOST AFTER THE RESTRICTOR PLATE RULE CHANGE?

     With the recent changes to restrictor plate engines you might find yourself asking a few questions on how your engine should be configured to stay competitive.  We thought we would try and help the DIYers out there on this subject with our recommendations to help make the transition as simple as possible.  All testing was done using an 880 big pipe.  These are our recommendations for restrictor plate engines and may vary by engine builder.

RED PLATE

Cam: CL2 or comparable Low/Mid Range Cam
Low / High Jet:   26 / 39.5
Target RPM: 5000 - 5400

We recommend the CL2 for a red plate engine because its peak power is in a lower RPM range.


GREEN PLATE

Cam: CL2 or comparable Low/Mid Range Cam
Low / High Jet:   26 / 38.5
Target RPM: 5400 - 5800

For the same reason as with the red plate engine we recommend the CL2 for the Green Plate.


PURPLE PLATE

Cam: CL2-R2 or comparable Mid Range Cam
Low / High Jet:   28 / 38
Target RPM: 5800 - 6200

In this RPM range we suggest you change to a CL2-R2.  The CL2-R2 has the same lobe design as the CL2, but the centerlines are retarded 2 degrees moving the power band up into a higher RPM range.


BLUE PLATE

Cam: CL3, CL2-R2, or Mid / Top Range Cam
Low / High Jet:   30 / 37.5
Target RPM: 6000 - 6400

The CL2-R2 is a valid option for this build, but you can also use one of the low duration cams on the market as well like the CL3.


PDF Version

Thank you,

Randy Garner