ls1foxcoupe

iTrader: (9)

Are there good blocks and weak blocks that gm made. I have heard that some blocks are thinner, anything to this?

ZONES89RS

iTrader: (25)

Not exactly, the "bad" blocks were really just the smal cube motors and the newer blocks that do not have huge aftermarket support like the old ones.

slow95z

iTrader: (33)

bad blocks have cracks in them from slung rods etc., other than that no problem with a 454. build it with good parts and you will be fine.

JUICED96Z

iTrader: (2)

I have been told the 70's blocks are the ones you want and a early 70's is even better. I just sold my 1970 .060 over block for $75.

raped 95Z

to my knowledge and my reasearch if the 454 block has the stamping on the back of the block saying "Hi Perf Pass" it is usually a high nickel block which is suppoed to be stronger than others

JUICED96Z

iTrader: (2)

Mine had that and I was told that it really just meant that it came out of a car and not a truck and that the casting year was more important.

chevellepowered

iTrader: (37)

me performance parts for the older ones.. i dont think any one really builds the newer ones.. i may be wrong.. 4 bolt the best.. but two bolts i have seen a 2 bolt with blower 800 h.p.. could always convert a 2 bolt into a 4 bolt..

ZONES89RS

iTrader: (25)

Correct, it is "High Performance Passenger Car" basically.

xx_ED_xx

iTrader: (17)

Is building a newer one. The nice thing about the newer ones is hydraulic roller cams and the gen VI they moved the oil galley up next to the camshaft so 4.370 stroke with out any grinding.

chevellepowered

iTrader: (37)

dang son, i gotta do my research, i might go with bbc again,