Soooo looks like I have a blown head gasket on my 18HP B&S Vanguard. Im debating what to replace it with. Id like to do whatever is the simplest. I assume a new 18HP B&S would bolt right back up, my question is if I move up to the 23hp what will that require as far as changes to my existing? Theres also the Predator motor but that looks like it requires a fair amount of modification. I do see that Richards Relics has the B&S motors, I plan to give him a call in the AM.