My brother is getting ready to bolt down the blower on his build and drilled out the rivets ages ago, the gaskets are good and he wants to re-use them, does anyone know what size the rivets are so he can re-attach them?

 

The head gaskets? Why did he drill them out?

They don’t seal the layers. Just hold them together till you bolt it down. Don’t see a need to rivet them back together. I hear a lot of guys on yellowbullet would copper spray their mls layers and put them back in

 

Not the head gaskets, the intake gaskets, my bad I kind of left that open ended in the original post. They rivet in place to locate them since it's a heavy awkward unit to try and set on the heads, line up gaskets & bolts, and not loose a finger.