I finally found the problem with my B18C. It had a warped head. SO I got another one from the local junk pile.. And what happens today? Well all in all Im pretty sure I spun a crank bearing... Damn thing ran awesome too... So is it worth it to pull it and rebuild it or just start over with another short block? Of course the guys over in the Prelude forums tell me to put an H22 in it like a true Prelude but I love my B.