Original Posted By: Steve Eldredge
Advisory Circular 20-27D Certification and Operation of Amateur Built Aircraft.Advisory Circular 90-89 Amateur Built Aircraft Flight Testing Handbook.To request AC's, Write:U.S. Dept. of TransportationUtilization and Storage Section, M443.2Washington, DC 205590To be placed on a mailing list for free AC's:U.S. Dept. of TransportationDistribution RequirementsSection, M-494.1Washington, DC 205590Yes, the bolt diameter for Continental Engine mounting thru the rubber bushings is 3/8 and the Engine Mount in the Grega Plans is right-- 3/8" id x 1/2" od x 2" bushing.________________________________________________________________________________