I dont know what the limit is but I used the stock crossmember with my sunset engine ,970 hp 582 ci . 9.40 at 147 . and it did fine .

 

Love your 55 :yes:

 

My 67 crossmember has handled enough power to go 8.60 @ 157.


The crossmember doesn't concern me, but that little bit of metal on the frame where it bolts up is probably a week point.

 

if you're running solid motor mounts I can't see the cross member getting a whole lot of stress....

 

That's kind of what I was thinking Davey, it just has always looked weak to me, and the nitrous hits like a ton of bricks. I'm always looking for weak points to address and try to stay away from breakage, but a guy could go nuts upgrading everything on these cars. My Grandfather always said "Don't fix what's not broke.", but there is something to be said for preventative maintenance. Rick, I have the wagon frame that is boxed from the factory, so the mounting point is a little more stout than the car frame. The downside is the extra weight.

 

It is a no concern item, it has been fine all the way down to 8.23 @ nearly 170 mph runs in my son's Chevelle. Your worrying about things that aren't going to break or even bend.

 

The factory Chevelle transmission crossmember is very stout and I don't think you have anything to worry about, especially with solid motor mounts. It is however, important that the crossmember is attached to the frame with good quality fasteners and washers on both ends of the bolts.

 

Stock one here as well.

 

Just like my buddy Joe, always over thinking things haha.