This numbers matching 350 block is out of our customer's 1970 Corvette. It came to us to be bored, but we also had to repair the threads in the motor mount hole. Here's how we used our old TCM-25 valve guide machine and helicoils to get the job done! 🤓 #chevy #corvette #chevycorvette #smallblock #smallblockchevy #sbc #chevy350 #numbersmatching #restoration #numbersmatchingrestoration #engine #engines #machining #machineshop #enginemachining #enginemachineshop #rebuild #repair #enginerebuild #en