Had a leak at the pushrod seals, hence their replacement. I thought that my pushrod tubes' seals melted, when I saw a mess of black at the base of one. After removal of the seals and pushrods, it looks like this: Looks like the PO used silicon to seal bases of the seals, to either forestall leaks or to patch one. Good or bad idea? Necessary? Here's the heads and pistons: Left side: Right side: Anything I should worry about from what you guys see? I plan to remove the carbon and see if that improves my high fuel consumption, reinstall stainless covers and new seals.