step son has one,looks like head gasket time,any real problems that stand out about this?,are they prone to crack/warp?,it has 140000 on it,will run 50 miles or more and just push out some water,system stays pressured up for a couple days if you dont loosen the cap,it looks to be all aluminum with cast iron sleeves,do the blocks warp on these also?,any feedback on this would be helpful
thanks in advance!
Butch