I know this subject has been discussed several times but I'm going to ask anyway......I have an '02 Z28 I am going to put aSNS stage 2 cam in and I was wondering if I could get by with not changing the oil pump and timing chain? I have 92,xxx miles...driving the oil pressure is just under 60 and acceleration it goes to 80+.......thought? Thanks in advance.......

 

I wouldn't risk it...Changing the pump and chain will take another hour, might as well do it while you are there, especially with a stock OP and chain approaching a 100K. That chain is bound to have some slack in it too. I would use a melling in its place and LS2 replacement chain.

 

I thought about getting an LS6 ported oil pump......on the WS6 store there are three different four types of Melling oil pumps.....a regular, high pressure, a high volume and a high performance high volume..... Which one would I need? High volume?

 

high pressure/LS2 chain

 

I would roll with it. Always run the risk of pinching the pickup tube o ring and having to tear back into it.

 

Mine is an 02 so I didn't do the oil pump (only 60K miles) but I did put the LS2 chain on for under $50. My cam is mild - no oil pressure issues at all...

 

definitely the chain. an LS2 will be fine.

 

I'd reuse the pump but certainly change the chain to LS2.

 

There is no risk of pinching the O-ring if you take your time when swapping the oil pump. The problem is everybody gets all worried because of what they read about on the internets. Matter of fact it had me worried enough I called a couple vendors when I was changing mine.

All you have to do is lube the new o-ring, slide it on the pick-up tube, pull down(gently) on the pick-up tube while rotating the oil pump counter clockwise into place. Once the oil pump is lined up with the bolt holes, thread a couple bolts in by hand. Now you can let go of the pick-up tube and it should be centered in the oil pump. Press the tube up into the pump and install the bolt...simple!

I just recently installed a new gm performance pump and have no issuse. 40psi hot idle, 60psi hot cruising using 5-40 synthetic oil.

The advice to reuse the pump is not good. Get a new gm pump and LS2 chain with the LS6 dampener. Again I changed the pump on my 2002 with 17,000 miles and it was still working perfect, but Why risk it for a 100.00 part? Especially when you chance having to tear it all back down to change it.

 

As long as the pump is in good condition and clean there is no reason to change it. Many good performance shops sell refurbished pumps<used pumps checked and cleaned. They just don't wear out like the pumps years ago did. Now the timing chain is completely different, the wear and should always be replaced.

If you do buy a new pump BE SURE to completely disassemble it to clean it and check the relief valve operation. New pumps are usually dirty.