Inliners International Forums General Discussion Engines engine mounts

I'm finally going to be able to get my old chevy on the road again. I've gotten a free rebuildable 250, I believe from a later '70s model truck. One of the first things I noticed is that the engine mount pads on the engine block are different. The passenger side looks to be the same as original, but the bolt hole spacing is different. The driver side mount is quite different. The three bolt holes are not only spaced different, like the other side, but also the single bolt hole at the top is about an inch or so lower(meaning not flush) with the two lower bolt holes. I just want to know what's the deal with this? Many of the other inlines and v8s I've looked at seem to be interchangeable, why would this engine be different? Sorry this is so long. Thanks!

When I'm home this weekend I'll try to remember to take a look at my 250. I'm pretty certain it has the same pattern you describe. Which would line up cause it's a '79. And just for knowledge the subframe I used to hold the 250 while I was working on it is now holding a '77 350 V8 and I didn't move the mounts around. So that 250 would be a direct swap for some V8's anyway. I wonder if the whole line (L6 and V8) changed mounting patterns sometime in there? Before '77 anyway. I'm not sure.