Wangan Midnight
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@SuperDicq That's crummy, although low stress junkyard engines have been known to last. If all else fails, getting a beater to tide you over should be an option.
It sounds too fast to be rod knock on a single cylinder, but too deep and loud to be the valvetrain. Intuitively it seems like a head issue. The long screwdriver trick may help you to isolate the sound, and a compression test could paint a clearer picture.
It's not over until there's a fist sized hole in the side of the block. That said, if you're committed to swapping, that's also understandable.
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