can i use a production iron truck block with a aftermarket 4.00 stroke crankto get at least420-427ci do i replace the sleeves?is this possible or do i need too look into the ls2-ls7 stuff i would rather stay with the iron block. fill it with blockfill if need be.plans are to build a 420+ci ls1 with a sheetmetal intake & carb(dominator)with some 350+cfm heads.fogger & a plate...

 

Can't resleeve an iron block, but you can bore it out to 4.060" if it's sonically checked and verified for such an overbore. Usually 4.03" is the norm and sometimes a 4.04" can be had without much trouble. Here is a list of possibilities with a couple of overbores and a 4.100" or 4.125" crank.

4.03" x 4.100" = 418cid
4.03" x 4.125" = 421cid
4.04" x 4.100" = 420cid
4.04" x 4.125" = 423cid
4.06" x 4.100" = 424cid
4.06" x 4.125" = 427cid

 

so then a 4.1" crank will fit the iron block?

 

The iron block, if clearanced properly, can take the 4.125" crank.

 

i see, this helps out alot. ive built alot of engines small & bigblock chevy's & several pontiac's all that made good power just have never messed with the new stuff (LS1,LS2&LS7)but im learning thanks for the info.