The only accurate way to measure using your other plate is from the face of the plate. Don't use the edge that sticks out with the holes. The center of the hole should be .955 (almost an inch) from the face of the plate thats bolted to the block. You want it just under an inch, not over because you need some meat on the edge. All the dimensions are in that article I posted earlier. If you use that edge I warn against, you may have that less than an inch on one hole, but not the other. GM wasn't very accurate on that particular edge. Not to worry though. It will come out fine!
To be clear, dont measure .955 out from the front face and mark there.. I am saying .955 from the face where the block meets. So subtract the thickness of the plate if you do that. Hope I am not confusing anyone.
Also, keep in mind that if you drill these holes from the bottom correctly, you will NOT be able to get the correct bolt in the hole from the top. If you think you can and use a big hammer, you run the risk of putting a hole in the cover. Read my explanation in the aforementioned article for a better solution.
Last edited by Deve; 03/22/2015 11:40 PM.
