fuelpump clearence issue
Too bad you folks won't explain what in heck you are talking about.
My bad. As the OP said, on some blocks there is a nub on the front of the block that’s real close to the mechanical fuel pump.
Sadly, I’ve never kept notes on that nub (I should have) to get an idea if the size of the nub changed over the years or some other change occurred.
It doesn’t happen often but some blocks, for whatever reason have the nub height/location or both in a position where the bigger, bolt together mechanical fuel pumps hit that nub.
I’m not close enough to the shop to get a picture, but I suspect (I’m guessing actually) that that nub is a riser for getting the air out of the mold when the block is being cast.
Ive never machined one off completely to see if there is a passage into the nub or not.
If I ever get ahold of a junk block I’ll grind it all the way off to see if it’s an issue.
I know some guys who need block weight at the minimum remove all kinds of extra casting features without issue. Like the engine mounts and such. I have to think that over the long run of the LA engine someone has taken that nub all the way off.
The result of that Ive never seen.