My Brother has a 6.4 truck with a bad cam, Bought it that way, knowing Im a chrysler tech and Im going to help him build him an engine for it. He is a quite competent diesel tech. So, I found some issues with his block, 266K on it, and they drove it with A bad cam for a while, Lots of metal went through the block, Really messes up a cylinder, Ether way, my Brother bought a new block from my dealership, but we dont need to spend a huge amount of money on this build in way of forged pistons or rods, but all these gen 3 hemi shops have take out pistons from the car SRT, quite a bit cheaper, but they all say the assy wont fit in a truck BGE block... But I read on here a guy put an entire SRT rotating assy in one. MMX says the Truck block is way thicker and interferes with the block.

We can buy take out brand new SRT piston and rod assemblies that will bump compression a touch, and have the full floating pin for significantly cheaper this way, and Ethen is wanting to go this rout.

Does anyone know if the claim from MMX is 100%, or can I clearance the block for the interference?

My parts catalogue lists two different numbers from the car to the truck im thinking due to compression on pistons, and the floating rods.

Kasey

A bge block is a bge block, truck or car is the same, the truck piston has the ring pack lower thus a lower compression & more durable than the scat 6.4 ,, copy a link where MMX said this

I dont have a link, but Ethen called them and thats what they said on the phone. I assume if Ethen was towing the beans out of the truck, this might not be the best idea, but if he is just driving it, and occasionally towing a dump trailer to the city dump it would be fine.

The other thing I like is the fact that they are a bushed wrist pin, and I could buy a nice set of lower end forget coated pistons and just run a lower compression piston but then get the durability of a forged piston.

I can tell you with 100% confidence you can put the entire 6.4 SRT8 rotating assembly high compression pistons and all in a truck block in a truck and it will run great. I just did this about a month ago and it runs great even with the truck 6.4 cam but I would plan on premium fuel, he had occasional 1 or 2 degrees retard due to spark knock but his truck also had 2 year old 87 octane in it when I put the engine in. If you are running the SRT8 crank you may need to remove the TQ converter centering ring depending on what trans you have and what trans it had.

Runnng the truck crank, this is great news. He did end up buying a brand new set of hellcat rods and pistons off marketplace for 500 bucks, so with the 9.5:1 compression, should run good. We both only run 91 or higher in the hemi stuff.

The 6.4 cars started using the BGE block in late 2016 / early 2017 - just grab the newest take out pistons he has

You can't run hellcat pistons and a 6.4 crank.

As for compression the new hemi EASILY handles 11 to 1 or more on 91 octane.

Hellkitty pistons are 1.275(ish) pin Height and SRT/Truck are 1.21(ish) pin,

Why cant a guy adjust the difference in compression with a head gasket, im measuring .006 thou difference, should be easily accounted for either way.

Hellkitty pistons are 1.275(ish) pin Height and SRT/Truck are 1.21(ish) pin, [/quote]

Why cant a guy adjust the difference in compression with a head gasket, im measuring .006 thou difference, should be easily accounted for either way. [/quote]
Check your math .065 difference

Its more like .060 difference. Yes you could run a much thicker head gasket but then you push the heads farther out making your ports and intake bolts no longer match up. Also I think the 6.2 pistons were a little heavier meaning re-balance. That stuff can all be dealt with but why not just buy some good used 6.4 pistons?

correct,

yeah hes taking it all to the machine shop here today, and yes we are balancing it anyways. He going to check pistons too to see if he can find a set of pistons. He has these, and they are new, so he was wanting to use them up...

Why cant a guy adjust the difference in compression with a head gasket, im measuring .006 thou difference, should be easily accounted for either way. [/quote]
Check your math .065 difference [/quote]

sorry, decimal point error...

In this whole thing I didnt take up the difference of the stroke from 6.2 to 6.4,,,,,,im dumb....