What are these M10 holes for?
 

Looking up at the bottom of my car just inboard of the front jacking points on both sides of car I see these 4 - M10 tapped holes on a 1" x 3" pattern. (See pic) Anyone know the purpose? Maybe a chassis stiffener mount for convertible cars?

I was thinking of making a couple of 1" thick 6" x 3" UHMW pads to mount there for better lifting / jack stand contact area.

Thanks,
Roger

Re: What are these M10 holes for?
 

Holes were/are for x-brace or frame connectors from vette to vette
John
1990 white /black #2546
one of a few auto (4l80E ) eq. ZR-1's

Re: What are these M10 holes for?
 

Look in the FSM section 10-3-8 or so (varies with year) and there should be an image that might satisfy your curiosity!

Re: What are these M10 holes for?
 

My underbody braces are missing!!!
Why would anybody remove them?
Maybe to make room for the Borla exhaust?
I'll get under there again tomorrow to see what's going on.
I am not happy, but thanks WVZR-1 for pointing that out.

Thanks,
Roger

Re: What are these M10 holes for?
 

Roger,
The x-brace was a convertible only add on. You're not missing anything

Re: What are these M10 holes for?
 

Thanks Kevin.
Back to my original plan then.

Roger

Re: What are these M10 holes for?
 

If you were looking to get a frame stiffener I'd go with https://www.vette2vette.com/?q=produ...r-bar-system-5

I have one in the garage, just need a lift to instal it

Re: What are these M10 holes for?
 

That's a clever idea, Roger.

I've heard of something similar, from Miata racers. They buy hockey pucks on ebay and bolt them to the frame welds for jacking points.

Re: What are these M10 holes for?
 

It can def be done without a lift. I did mine in about 1 1/2 hours. An hour for the first side and 30 mins for the second.

Re: What are these M10 holes for?
 

you're a braver man then I am. Maybe I can talk a few guys into doing it at carlise for me ;)