not entirely true, one guy I know on a different forum who is in Austrialia got his Pajero 6g75 block sonic tested and his 6g74 block sonic tested
http://3000gt.com.au/car/74%20vs%207...all%20test.pdf
http://3000gt.com.au/car/74%20vs%207...all%20test.pdf
if you are having problems reading the handwriting, same guy was able to read it
so at least with these specific 6g75 and 6g74 blocks, it appears the cylinder walls have nearly if not the same wall thickness, the 6g75 was revised for the bigger bore while retaining the same wall thickness, but this might not be true with every 6g75 and 6g74 block due to core shift and different versions of 6g74 and 6g75 blocks (such as JDM 6g74 blocks and MIVEC 6g75 blocks might have changes), it is worth investigating independently to be sureThe 74 varies from 235-289 thou with the majority around 270 thou
The 75 varies from 230-275 thou with the majority around 260 thou
from what I have read, people use 6g75 cranks (and maybe other components) in 6g74 blocks because
A: the 6g75 block is busted (it happens more than anyone ever wants)
B: if they have a 3000gt or a Stealth, it requires a large amount of fabrication to get the 6g75 block to work (no mounts for half shaft hangers and what not for the 3S platform), a JDM 6g74 block (at least from my reading) is much closer to a drop in with a few modifications