mini zilo
15+ Year Contributor
- 783
- 16
- Jul 17, 2006
-
Chicago,
Illinois
I just picked up a 1997 7 bolt from a buddy of mine. It has never been started before, but it is a full short block. It has evo pistons and rods in it with new rings. The block has about 68,000 miles on it. Well, I pulled of the oil pan today to make sure everything was in spec. I checked end play, and it is in spec, I checked connecting rod to crank side clearance, and it is in spec. I also checked a few other things. The one thing that had me a little worried was the piston to wall clearance. Now these pistons are BRAND new and so are the rings, but the block has 68,000 on it and it was honed before this was put in. The spec for piston to wall clearance is something around .001-.002". With mine, I can fit a .004" feeler in between the piston and wall. What would happen if I ran the motor like this? Is this going to be a huge problem? I realize it is "trying to get away with something", but how serious is this? Thanks
Do you think the clearance might have something to do with the pistons from the Evo being made of a different metal, so it needs more clearance to expand or something like that?
Do you think the clearance might have something to do with the pistons from the Evo being made of a different metal, so it needs more clearance to expand or something like that?