Its either gonna be the 3L 7M-GTE or a 2.5L 1JZ-GTE or a 2L 1G-GTE.
is it stock in the 89 year supra
Yes it is...
and the 1jzgte is a 2.5 twin turbo right?
Yes it is. Fitted in the JZA70... Use Google and Search feature of this forum to find more info... The 7MGTE was fitted in the MA70 & MA71. The 1GGTE was fitted in the GA70...