Hi. Have a 1700 xflow which was rebuilt and put into my car last year. Has a bcf3 cam with +90 1300 pistons. I had my twin 40's setup on a rolling road and have been running the engine in, varying speeds etc but not going silly and all seemed ok. Last week i reversed car out of garage and warmed her up, revved it abit and suddenly i got this horrible knocking/rattling noise coming from the engine. I've just taken head off and found what looks like marks where valves are hitting the pistons possibly. Could this be the cause and why would it just suddenly happen and not previously when ive been running the car for several miles now. If its not that what else could it be? I'll put some photos below. Any help/guidance appreciated. Thanks.
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