I'm planning on buying a b16sir2 longblock cause my sir 1 longblock dropped a valve. I have noticed that after i called a few motor selling places, they have told me that most of the longblocks were from auto tranny cars. I know the difference between the sir1 auto and manual. ( throttle body size, cams, ect) I was just curious is anyone knows the specifics of the sir2 auto/man differneces. Like the throttle body size and cam specs and things like that.