hi all i purchased a f reg rs turbo cabby conversion, when i purchased the car on the right side of the block if looking at it from under bonnet, sorry for lame description there is a very noisey tapping noise {i no thease are sometimes a bit tappy} but this is excessive , the prevoius owner said he changed the hydrolic lifters a week ago. i did find out he put the wrong oil in which i have now replaced. my question is the tapping noise is still there and sometimes goes quieter but not for long before it returns also the oil light flickers on tick over when warm, the car is running 221bhp and has had a kent cvh35 cam fitted but is running on the orignal ford spec lifters and valve springs ect and the car is still running the standard oil pump. i am wondering if i need to up grade the lifters and springs ect, and the oil pump to clear the problem or is the car ok running with the orignal spec lifters and standard oil pump.

i hope some one can help thanks