Can anyone confirm for me the Top Dead Center/Bottom dead center combinations? example if 1 is at TDC then 3 is at the bottom... 6 & 2, 8 & 7, 5 & 4. Silly question probaby but I'm going to change the vavle stem seals with the heads on. Someone told me that if I pressurize the cyl at the bottom a bit more than the one at the top it will keep the motor from spinning while I work on the one at tdc.

Then again, maybe I'm making this harder than I need too but I've got what I need to do it and it might be easier than blocking it somehow.