Who here uses a big block oil pump on their small block? I just realized the guy that built my motor last time did. I'm not sure why or what you would benifit from it? More volume? Anyway, I'm angry now because I finally got everything to put my motor back together and now I can't do any more tonight because Napa is closed and I ordered a small block pump. I guess the 5 bolts on the pump cover instead of the usual 4 should have given me a hint. Oh well at least I learned something. I also believe the shaft is shorter that hooks to the distributor when I compare it to a regular SMC one. Maybe because my block has been decked? I don't know. Anyone else have any input as to why this may be? Now I have nothing to do except sip on this fine Rum and Coke.