Installing the connection rods to the crankshaft

Are these stock 351C rods? The stamped numbers should be facing outwards for correct orientation. You will notice that one side of the rod end is flat and the other side has a chamfer. The flat side is designed to be placed against the other rod on that crank journal. The chamfered side is designed to be able to ride up along the crank journal. The stamped numbers on the stock rods are designed to make this happen.

The oil squirt holes will point towards the opposite cylinder bank.

Julian

Hi Julian, yes stock rods.
Sorry for my bad english , what is a chamfer ?

On the top of the rods , there is one side with more weight/ material than the other side , do you mean this ?

My rods are not stamped, and all the parts were mixed togehter by the pre owner of the car, so for me it is verry difficult to put the engine togehter.

Thanks

A chamfer is a taper, where the edge is cut at usually 45 degree angle.

small block Ford engines, including the 351C, have narrower bore spacing than the small block Chevrolet. Due to this the "big ends" of 351C connecting rods are narrower (0.830") than the big ends of small block Chevys (0.940"). A 351C rod journal is 2.31" diameter and 1.66" wide, whereas a small block Chevy rod journal is 2.10" diameter and 1.88" wide.

It was once popular to off-set grind the 351C rod journals to 2.10" to achieve 3.70" stroke, and to then use 6" long Chevy rods which were modified by machining one side of the rod thinner so the Chevy rods would fit on the narrower 351C journal.

Could this be the case with your engine?

If so the picture below indicates how the rods should be assembled. These rods also use a different rod bearing (from a marine application), not the standard 351C bearing.

Top of the rod . There is a bigger "weight" and a smaler one. I think this should help to balance the top of the rods.

The bigger one

Downside at the bearing: the bearing is not exact in the middle. So when you put both rods together, there is a bigger or a smaler distance between the bearings. Like a little space for the oil. When I understand the meaning of a chamfer right- I have on both sides a chamfer

The bigger distance

Is this the case where the Centraline connecting rod by Morrel/Tim Meyer come to the rescue?