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So on some further research the last week and a bit i have come up with some casting numbers of the thicker , higher nickel content 4.3 blocks. these blocks are from the 92,93 era and the last three digits of the casting numbers are 073, and as in the pictures on jwallers website under jamie...

small block and v6 are the same bolt pattern, just make sure that it is a counter-clockwise rotation type, for a serpentine belt setup.

you said you adjusted the lash?....the reason i ask is because of my experience with chevrolet roller rockers, especially used ones, is that they dont bleed down properly once filled with oil, thus opening the valve when you adjust them, instead of pushing the lifter down a bit. I had this...

My search continued for a stronger block and i came across a couple of marine blocks that seem to have thicker cylinder walls at a local machine shop layin around, so i might pick up one of these, also one is already bored 0.030 so my pistons will fit. Im gonna try to find some info on a T...

ok so after further inspection of the crappy stock block i have also discovered that the cylinder walls of all six holes were deforming under load so bad that the rings were only touching on about 50% of the walls!! The block is only bored .030 and I only had about 5000km on this block since...

just pulled my 4.3 from my 85 awd blazer and found a 2 inch crack in the cylinder wall on number 4. at least i know why it had a misfire and a milkshake in the oilpan.....lol... my question for all of you 4.3 guru's is , does this happen all the time? i mean when you run lots of boost to a 4.3...