What are these M10 holes for?

[BlackZR1]

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

[aafc]

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

[WVZR-1]

Originally Posted by BlackZR1

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

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

[BlackZR1]

Originally Posted by WVZR-1

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

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

[Kevin]

Originally Posted by BlackZR1

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

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

[BlackZR1]

Originally Posted by Kevin

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

Thanks Kevin.
Back to my original plan then.

Roger

[Kevin]

Originally Posted by BlackZR1

Thanks Kevin.
Back to my original plan then.

Roger

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

[RussMcB]

Originally Posted by BlackZR1

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.

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.

[BlackZR1]

Originally Posted by RussMcB

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.

Simple project is complete. Easy target for jack and large surface for jack stands. Avoids contact with fuel lines.

Roger

[Fully Vetted]

You'll need to remove the rear wheel so a jack and jackstand is needed but honestly you're not even under the car. If it wasn't for needing to drill that one hole (which is why you have to remove the wheel) you could almost do it with it on the ground.