I just got my gsr block back from the machine shop and they didn't give me a new
oil pump because they said in their book, the 94-95 gsr oil pump is different than the 96-00. The reason I need to find out is becasue in their book, the 94-95 oil pump is OVER 350 DOLLARS. The 96-00 is just around 100 dollars. They owe me the pump, but tell me I need to find out what year block I have so they can be sure to put the right one on. Thanks for any help.

 

hrrmmm.....thats new, i always thought the pumps were inter changable

 

the obd2 pumps have a crank angle sensor and obd1's dont.

 

but if youre running obd1 than it doesnt matter cause the ecu doesnt read that sensor. My harness is obd2 but i just eliminated that plug from the harness and i just but a 91 ls pump. thats all.

 

That was about the only thing I could think of in difference was too, the obd.
Would it be possible to use the obd 2 pump on a obd1 block.

Answered that before I could even ask. Thanks.

 

you can run either or they are the same price

 

so you can use any pump, right/?

 

Well the thing was that if it was the 350 dollar pump, they weren't going to give
it to me because of the huge price difference. So that helps that I can get this pump practically for free. I am already into this project enough as it is.

 

i know i just rebuilt my block so i know the differences now between obd1 and 2 blocks now

 

Is that the only difference.

 

my 91 pump has different mounting points on the outside for the timing cover than the 98 pump.