There was an SB regarding the bolts and blocks used in this area. I believe they are required and have been overlooked by some builders.
Built/Flew an RV-7A
Air Troy Estates, East Troy, WI
Ford Expedition and TRICE "Q"
Built Glen L "ZIP" Classic Outboard Runabout and Super Spartan Hydroplane
Glen L Torpedo
Porsche Boxster 718