Join Date: Nov 1999
Location: Central California, USA
Re: Global West front sway bar bracket bolts - Too big?
There is less room for a bolt head too. I'd use Allen bolts, they are grade 8 and the bolt head is small for better clearance.
On our 68 Camaro I put in a larger bar and drilled the frame holes out, welded 3/8" nuts onto a plate that was put inside the frame rail. The 5/16" holes are hot formed by pushing metal up into the subframe so it's like a metal tube inside. Drilling to a 3/8" -16 tap drill size (5/16") will weaken the tube and you won't be able to thread what's left. Drilling to 3/8" to install nuts still leaves a bit of the metal there, I think you need to go almost to 7/16" to remove enough of it. Also inside the frame has a step where the two frame halves meet, there is also a raised area in the center of where the bar sits that is meant to keep the frame halves from overlapping too much, this forms a bump inside that prevents a flat plate with two nuts from sitting right.
Check my web page for First Gen Camaro suspension info:
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67 RS 327 original owner. 1965 Lola T-70