TECH UPDATES
2012 AKRA 2012 Tech Updates
Effective 2/20/2012
Page 48: Block Requirements: Stock cylinder bore is 2.685” max. Stroke is 2.123” + .010” or - .010”.
Page 48: Valve Train: Stock valve cover only with any stock configuration gasket, no sealer. Factory stock rocker arms 1:1 ratio and push rods only. Stock valves only 45 degree angle only
both valves, Intake valve Max OD .982” +/- .005” and Exhaust valve Max OD .945” +/- .005”,
no modifications allowed.
Page 49: Minimum thickness of Intake retainer .227” , Exhaust retainer .250”. BS lifters only, no modifications allowed.
Effective 5/1/2012
Page 48-49: Valve Train: Add ( Additional check for valve springs – Each spring is to be checked using a .750”height by .800”width plate gauge and a .250” (square) no-go gauge to check the center spacing of the spring coils while inserted in the plate gauge.) Prescribed check procedure as follows – Insert the spring in the .750” X .800” plate gauge (spring must be centered in plate gauge and must fit inside of gauge with the ends of the spring wires perpendicular to the plate ). Once inserted in the plate gauge take the .250” no-go gage and check the center coil spacing on both sides. The .250” no-go gauge must be parallel to the spring wire and perpendicular to the center of the spring when checking. The .250” no-go must pass check on at least one side of the spring. This check is to be performed after the 10.8/lb check and .071 max wire diameter check have been performed.
Important Note
Due to distribution issues and availability the Mandantory date of 7/1/2012 for the BSFW-1 (Steel Flywheel) will be suspended until these circumstances have been resolved. Also with the no timing rule for the BS classes there should be negligible performance variations between the BSFW-1 and the current Stock cast flywheel.
