My local Chevrolet dealer will install a brand new timing belt for $350 out the door. I've reviewed the maintenance tips on this in the forum and it's only time consuming not hard . I just don't know if I have a spare 4 hours anytrime soon. Does the dealer charge of $350 sound resonable. Service Manager advises at that price they only replace belt not and tensioners etc. unless they are bad. What do you guys think?