Different Evo Pumps
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Stage III
Joined: Nov 2007
Posts: 3
Likes: 0
Different Evo Pumps
Is there a modification that can be done to the oil pump 1992 so it will fit 1991 and down.It shows the bolt pattern is a bit different.Can i modifie bolt holes to fit older block 1988.Not sure if the oil routing is different.I am just new at this thing but willing to listen. If not i guess a new is on order.
Road Captain
Joined: Apr 2005
Posts: 535
Likes: 14
From: Highspire Pa
RE: Different Evo Pumps
I can't answer your question but have seen a drilling guide sold by after market places such as Dennis Kirk to fit performance oil pumps to older models, the guide it is not needed for newer models. My guess is with the guide you may be able to drill the needed holes. Let us know for sure, I have a '90 and considering upgrading the oil pump.
Seasoned HDF Member
Joined: Aug 2007
Posts: 8,196
Likes: 3,085
From: NW AR
RE: Different Evo Pumps
That drilling guide may be to drill the extra hole on Shovelheads to use the later pumps. The extra hole is up at the top. I had to drill it by hand when I replaced the pump on a 79 because you couldn't find a jig anywhere in the mid 80's when I did it.
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