Hi guys , just rebuilt my k20a2 with nippon racing pistons and scat rods, dual valve springs, new chain new tensioners new oil pump, everything new. Fired up on forst attempt and noticed a knocking noise comong from timing chain side. Removed timing chain cover to inspect and found timing chain marks on bottom of timing chain cover. ( timing chain was slapping onto the timing chain cover). Replaced timing chain and tensioner again tought tensioner went bad but noise still there. Any one had this issue before ?. Photos attatched below.