grygst76

I have a 1994 z28, I keep seeing references to 2 sizes, 5/8 and 3/4, which one do I have???

Guest47904

The standard SBC is the size you want. Haven't seen any listed that said the size you listed though.

Dave89IROC

agreed, the only thing I can think of that lists those sizes are the pick up tube

grygst76

when I call around to places they ask me the size of the hole???? so I ask them what hole they say UHHHHHH.... Lt1's take a standard oil pump from sbc am I right??

grygst76

I guess my question is what size inlet, 3/4 or 5/8?? It is a 94 and I do not have plans to replace the shaft, I will drop the pan with the motor still in. Since when did they start changing stuff again??

Guest47904

Also standard SBC with 3/4 inlet port.

Here's a pump
http://store.summitracing.com/defaul...=egnsearch.asp

Here's the style pickup
http://store.summitracing.com/defaul...=egnsearch.asp

Remember the pickup must be matched to the pan depth. So you have to find the correct depth for the pan you have. But use the type with the extra support. Would be a good idea to tack it in place also and be sure to remove the spring and check ball parts when you tack it.

You will need to replace the oil pump drive shaft since the one from the factory has a plastic collar and should be replaced with a stronger metal one.

grygst76

No replacing is needed, come to find out is was the oil I used, mobil 5000 mile oil, GARBAGE!! I lost significant pressure and when I went WOT pressure dropped to almost zero. I changed my filter to a Napa and went back to conventional dino 5W-30 and my pressure is back where it belongs. Thanks for the updates on the pump size though, I am buying the tube and pump and installing it at a later date...