K20A or K20 A2 or K20 A3

[mani_is_kool]

Guys ... How do u know the difference between a K20A1 K20 A2 and a K20A3 ??? I dont know that much abt K20's and if someones selling one ... how do u know if its the A1= 210hp one ? or if its the A3=160hp one ?

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[Boilermaker1]

I know searching is really hard... but give it a whirl.
The code is stamped on the block, its easy to figure it out.