Sorry guys to start a new thread for just a quick answer but this is really bugging me

Just went to crank the engine by hand (plugs removed of course) as it's been forced to sit for ages & I just filled auto trans (4.5L & it's full , I realise torque converter takes a bit but still?). Anyway, when I crank it clockwise, no noise, easily spins. When I crank it anti-clockwise, a knocking noise from piston I think hitting cylinder walls? Spins just as easy though.....

Is this due to engine operating in a clockwise direction? Sorry but I have never had engine running to check myself since it replaced the ruined one so long ago so, could someone put me in the know pls

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