Im haaving a hard time finding any other than diamond. Who else sells a piston like I am after? I know someone else has to make them Its not like I am the only guy building a lil engine like this...

440 source does, but they have .990 pin size so different rods would be needed.

That's the issues Im running into. Precision engine products sells a billet I beam rod in the low 300 range for money, I could easily have that into a set of LY rods. So I may e going in that direction.

You can bush the LY rods for .990" pins, but like you said, you'd likely have enough into the LYs that you could have bought some stronger aftermarket rods. Just make sure you have the cheap aftermarket rods checked for size...they'll probably need resizing.

Yes for sure on the checking. I was told by the local shop that its like 25-30 per rod to have them bushed. I just got off the phone with mancinni and they told me that diamond can do changes at 6 bucks per change to a point. So with using the 516907 piston, changing the bore to 4.290, and making the pin to 1.094 it would be 96 extra bucks per set of 8 so like 740 bucks for 8 pistons. Im good with that. Ill just polish the LY rods, and put my ARP bolts in them and be done with it. the LY is going to be fine for my application anyways. If I still had the tools at my disposal Id swedge some bushings in the rods myself and pin fit them myself, but Im way away from those tools anymore.

4.090" bore???
You're gonna have those LYs resized after you put the ARP bolts in them right?

Sorry 4.290

.040 over is where my block is at.

What CH piston are you looking for ?

1.5

This spec with a 4.290 bore and a 1.094 stock pin.


Bore (in): 4.280

Stroke (in): 3.375

Rod Length (in): 6.768

Piston Material: Forged aluminum

Piston Style: Flat Top

Compression Distance (in): 1.516

Dish Volume (cc): -4.0

Pin: .990 x 2.930

Piston Ring Grooves: 1/16" x 1/16" x 3/16"

Quantity: Sold as a set of 8

So what is the problem ? Call a Diamond WD, or Diamond direct, and make it happen. 2 changes to a shelf stock piston is a small up charge, they will make it in your bore size with the big pin.

If you are indeed running a 440 crank in a low deck with a RB length rod that compression height is not going to work for you

Ross part #99894 could work if changed for 4.290 bore

Whay is the compression height I need for the 440 rod and 440 stroke?

1.320-1.330 range

They make a piston, 51950 that's for a 3.75 stroke, and a .990 pin. Id need to have them make it a 4.290 bore, and Ill just buy the PEP rod from Hughes. That's only 1 change and im there.

Prolly better to run the PEP rod with the .990 pin and the floating pin end anyways.

x2, right?

Oh yeah that was the plan, now Im just going the PEP rout since ill have 300ish into the LY rods by the time I pay the machinist

Good idea , buy the cheapest of cheap chinese junk rods possible ....

What material are those CCJ rods made of ???

so buy the Diamonds. They are good people to deal with and they make a good product.