Oil pump , chain, sprocket

[quattro]

Hi All
In the middle of rebuilding engine for a track car and have question concerning oil pump.
Engine had done 120k miles before being pulled down so I guess oil pump should get some attention.
So would new genuine be best? or are there good pattern ones out there.
Alternatively if there isn't too much backlash in the gears could the casings be machined to re-instate tolerances?
Also drive chain do they ever break? or should I just replace as matter of course?
Lastly the drive pulley on the crank should this be replaced?

Many thanks

 

[Mar172]

I would not buy patten parts call Renault Wolverhampton in the trade section

 

[NorthloopCup]

If you had no oil pressure issues beforehand I'd stick with the oil pump you've got. Clean it out, check the pressure relief valve plunger moves freely, pack the pump full of grease and run it again. The grease will generate the suction you need to get oil pressure in a fresh engine just in case you were wondering.
I also wouldn't touch pattern parts - I've seen genuine stuff have enough issues!!
You can do a certain amount of machining to the oe oil pump though, but you've got to know what your doing.

@Dan@SJM can supply uprated oil pumps - that's where I'd be going.

 

[quattro]

Thanks Mark.

 

[marinemackay2003]

More info needed on uprated oil pumps