ok so i just got a str fuel rail and i was switching it with my old horrible leaky AEM rail. and the 3 bolt holes that held the old rail down were on the verg of being stripped. my question is. does anyone know what thread cert size to get? or even what helicoil to get? ive already upped the size to standard tapped it and it still stripped out.

btw its a skunk 2 intake mani..

thanks for your help.