Quote:
Originally Posted by johnjzjz
OK -- ARP and melling do not need moding to work -- in some cases the pump shaft clears the block - what happenes is the shaft rubs on the bearing cap or the cavity of the block to the pump - NOTE : the 400 motors had very bad core shift and as such it was determined to make a shaft just for them - the blocks 2 and 4 bolt were the same and the after market shafts almost all work -- install pump, shaft and dist, and turn it if its totally free your in -- jz
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So you say that both the standard ARP and Melling shafts should work fine in a 400 block, but check that the shaft spins freely to be sure due to the notorious core shift issues with 400 blocks?
As I said above, my motor is already together and running with the stock pump and shaft, I just thought that it would be a good idea to replace it while I'm putting a new oil pan and gaskets on.
To test the shaft, would it be ok to install the new pump and shaft, and then just try spinning the shaft with a screwdriver, or should I pull the cam gear off of the distributor before installing it and test it that way?
- Justin