Full Float Pistons/Rods. How to?

[bschubarg]

I am building a some what of an unusual stroker 318 and have a quick question with some more soon to follow since this is going to be my first engine build and leave it to me to make it a stroker.

Anyways, I have a set of 340 Rods that are bushed. I also have a set of pistons that are for either pressed pins or floating. The O ring gap is present on both ends of the wrist pin openings on the piston.

The pistons came with pressed pins but I want floaters. Is there machining involved to get the pins to float or do I purchase pins made to float?

What do I need to do to get this assembly to be a full floating rod piston assembly?

BTW, the block is a 318 with a Forged Stroker 3.51" to make my bored 0.030 a 341 CU. IN. It will also have Magnum heads and a Air Gap intake with a yet to be determined carb(leaning towards a Rochester Q-Jet). Most of the parts damn near fell into my lap(read cheap) so I don't want ot hear...."Why not just build a 360....?"

I plan on taking pics as soon as I get all the pieces together(bearings, machining, etc) before I assemble. I am hoping some of you guys can walk me thru this. Now just exactly, what is a torque wrench....? J/K

 

[C130 Chief]

You need the spiro-locks for the pistons to keep the pins in place. Also check the length of the pins, if they were designed for a pressed application, they may be too long. Remember the pin presses into the rod and not the piston, if your rods are bushed they should be correct for floating pins. Measure to be sure, pin bore in piston and rod small end should be close if not the same. Check the factory service manual for pin-rod clearance, and consult piston manufacturer for piston-pin clearance (should be OK if pins were supplied with pistons).

 

[bschubarg]

You need the spiro-locks for the pistons to keep the pins in place. Also check the length of the pins, if they were designed for a pressed application, they may be too long. Remember the pin presses into the rod and not the piston, if your rods are bushed they should be correct for floating pins. Measure to be sure, pin bore in piston and rod small end should be close if not the same. Check the factory service manual for pin-rod clearance, and consult piston manufacturer for piston-pin clearance (should be OK if pins were supplied with pistons).

Now that makes some sense. So from what I understand, the pin supplied with the piston is the pin I use to make my rod/piston assembly a full floating assembly because my rod is bushed for floating pin and not pressed and all I need is some spiro locks to keep the pin in place....

How is that for a run on sentence!!!

You'd the man. I thought I had to do some honing of the piston or shave the pin. I will have to admit however, It does require alot of effort to get the pin into the piston and thru the rod. I was under the impression that the pin would slid thru easily....