I have a 4x4 98 blazer and was wondering if a 2018 camero stock 18in rim will fit on my blazer not worried about lug nut pattern but am worried about the center hole being to big or to small

 

I can't answer your question, but perhaps this website could.

Be sure to report back and especially if they fit, people would love to see pictures!
https://www.wheel-size.com/

 

I have never done it, but others have. The lug pattern is not the same but it's very close (Camaro = 120mm x 5 vs Blazer 120.65mm x 5). They'll definitely bolt on, but you would be placing some lateral stress on the lug nuts as they are tightened down. Others have done it and I've never seen anyone mention broken lugs due to this. It's your decision if you're ok with the risk of laterally loading the studs.

I don't have the center hub bore measurements off the top of my head, but the Camaro hub is smaller, so you would need to ream out the bore of the Camaro rims for them to fit onto a Blazer. A machine shop would be able to do this, or if you're adventurous a Dremel will also work. Personally I'd want the hub to match exactly so I wouldn't recommend reaming them out yourself unless you have the proper tools to get the measurements right. Even a millimeter or so off-center could make it impossible to balance the wheels and you'd never have a smooth ride.