I have a 350 from a 87 suburban and a 350 from a 91 suburban.... which one you think i should use... I havent cracked open the 91 but according to the casting numbers it may have a roller cam, and a 4 bolt main.
and know nothing about the 87 yet since I havent quite pruchased it yet.

you can put a roller cam in both of them. but as far as i know none of the truck engines came with roller cams.

but being a '87 or a '91 there's no saying that the original motor is in there. in my 88 truck I discovered at cam swap time that I had a re-man'd roller motor in it.

87 up blocks are roller motors but the truck engines did not come with roller cams.

Well I bought the 91 it is so seized with water I cannot even get the pistons out of the block.... its screwed... I guess I loss a 100 smackers... I will buy the 87 tomorrow....another 100 for that..

there was definately a roller cam in my engine, a crappy rolller cam, but a roller none the less.

I have seen many,many 87-91 blocks that were cast for the lifter spider,but not machined or tapped.I don't know what it would cost to properly machine one for a roller cam spider,but it's definately something to keep in mind when shopping for a 1piece RM block.

Doesnt matter both of the engines are junk... cant use them... one is seized the other threw a rod and that wont turn either after the rod was removed..