I have a guy near Metro Airport that works out of his garage (near Telegraph and I-94). He gives great head... LOL!!!
Seriously, he works on all makes, can do valve jobs or complete engine builds. He's retired from Trenton Engine who made the slant 6 and big blocks and is familiar with Mopar and other makes... He even will do valve jobs on private airplane engines.
He also has connections with Moran Motorsports.
