hi all

got a problem thats doin my head in.
ive just put my engine back in car after bottom end work and there is a nasty knocking noise i would say its coming from the top .
ive had the rocker off an there is plenty of oil gettin pumped up an there looks to be no wear on the cam lobes.
im thinkin its a lifter problem but have never heard any as loud as this
have any of you had a problem like this????
any help would be greatly appreciated


thanks
barry