diabloadsit
New member
So you can learn some about the codes the 903 is the casting number. Also, the AB on one side and the AB on the other side means that you have 2x A pistons and 2x B pistons.
The piston to wall clearnence is tighter on the A side than the B. I guess the best block to get is a AA AA block the next best is a BB BB. If all the pistons match each other than its a really good thing.
This pretty much applys to all subaru motors.
The piston to wall clearnence is tighter on the A side than the B. I guess the best block to get is a AA AA block the next best is a BB BB. If all the pistons match each other than its a really good thing.
This pretty much applys to all subaru motors.