V6- 231 & 252 rod directrion for installation

[bbatka]

Hello all, I have a 252 N/A engine getting rebuilt. I just got back my boxes of parts to re-assemble my engine. I noticed that three of the rods have the double bump/dimple opposite side of the piston direction notch. The machine-shop foreman just told me that the rod bearing surface notches are to be orientated to the outside of the engine- thats why three are "backwards". Its the 1-3-5 pistons that have the rod bumps facing the rear of the engine.

But everything I've always read says that the two rod bumps/dimples are to face the front of the engine. Which is correct? Gotta find out before I try to assempble this engine and blow something up!!! Thanx in advance!! brad b.

[Buickspec6231]

1) Notch on piston towards front of engine.

2) No. 1, 3, 5 two bosses on rods towards rear of engine. (Not Shown)

3) Chamfered corners of rod cap towards front of engine.

2) No. 2, 4, 6 two bosses on rods towards front of engine. (Not Shown)

3) Chamfered corners of rod cap towards rear of engine.

*edited.

[BigRivy]

The machine shop is right. 3 one way, 3 the other.