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Based on what you all have seen, which small blocks have: 1. the thickest main bearing saddles/webbing? (In a magazine article linked on this site there was an older 318 being built up and it looked like it could be fitted with 4 bolt mains!?) 2. the thickest cylinder walls? (I think someone...

So were 360s actually overbored 318s with a longer stroke in an effort to save production costs or were they always different blocks? I know the 318 came first, but I'm just thinking by the roller cam era it would have been a 'common block' design.

Your statement is partially backed up by this article: http://www.440source.com/blockinfo.htm but I'm also referring to their pics concerning main bearing support which is more my concern from messing with Olds motors and have seen some nasty outcomes from lack of support. Still that's in the...

Well as it just so happens I found a 400 B in a 77 Newport at local junk yard, but it's not an early block with thicker mains. I also found multiple 318 LA roller cam motors (but no 360s) and some A-518s for the OD which I really like for a daily driver. Of course no idea on their conditions...

Believe me if I find an early 400 that's not bored out crazy, I will grab that puppy over a small block and then it's a different topic. Yet, it looks like 360s are going to be the most abundant candidates around here. So if that's the case, I'm looking to make 400 RRRWHP (Reliable...

I'm considering a small block for my Dart (if I can never find a 400) and want to know opinions AND facts about small BLOCK strengths and weaknesses. 318 poly, 273, 318, 340, 360, 360 magnum, etc. Specifically why you feel one size and era is the best over others (wall thickness, main saddles...