[TRADERMIKE 2012]

Originally Posted by Kenth

1. You are measuring at the wrong spot.

2. All rods have a chamfer to leave room for the bearing to the radius on crank. Look closer. Also, the rods are offset and need to be positioned with the notches towards radius on crank. You can NOT just look at the spurt holes.
If there are no notches on rods (aftermarket) you need to check how the bearing sits in the rod, side with more room goes towards radius on crank.
Your 1967 and earlier rods are cast I-beams. 1968 and later rods are reinforced at the big end as shown on my picture.

Mikes reply:

I just got through studying your photos and if they are correctly drawn to Pontiac specs this is how I read the information, in simple terms:

Hopefully I get this rite, The ID Boss on the large end of the Rod to Crank Pin is orientated toward the Radius side of the Crank Pin.

The Piston Notch always points forward.

The Spurt holes always point toward the Cam, up and are supposed to get oil to the opposite Pistons Skirt, wrist pin and under the Piston Rod area.

The non-boss side of the large end of the Rod to Crank Pin is orientated toward the center and is adjacent to one another.