gm 4 cylinder engine size and year

[markc52]

I have a gm 4 cylinder engine. the numbers are gm2770087 cast on starboard side of block. left side of distributor has numbers mo9206rb. any and all help is appreciated.

 

[bondo]

Ayuh,... You've either got a 2.5l, which has only pulleys at the front,...
Or,...
It's a 3.0l which has a harmonic dampener, 'n pulleys on the front,...

Their identical, other than the dampener, externally,....