Actually by doing the re-sleeving, my cylinder walls will be no thinner than the stock sleeves. Horsepower is extremely important but I do want a great deal of reliability and drivability. I would like to get cryo as an added reliability item but its not necessary. I have a friend who has made over 600rwhp on a stock block (with cams). Here in Japan, I don't know of anyone who is doing cryo yet there are many Z's in mainland with more hp than my friend. I don't believe a block will break. Now the crank and girdle is another story. SGP Racing has broken their girdle at high hp - and I heard that was a cryo treated engine. That is a big concern but I don't know what to do about it.
