Stock pistons

[376shovel]

Will the stock Pistons in our engines work with a floating rod? Specifically the coyote rods. Looking to keep costs down on a mild rebuild and resuse the stockers.

[Thenwhat85]

Yes.im going to be doing the same thing but I got some good used terminator pistons to use also so the rotating assembly should take 600hp all day reliably

[RubberCtyRauder]

I don't see how? the cranks are different, the displacement is different. how are the rods going to be the same? I don't know myself, but iot doesn't seem logical to me..coyote stuff is not interchangeable with 4.6 stuff.

[376shovel]

Ok cool. I actually just read the stock Pistons are floating. Did not know that. Good to know. I will check these pistons out and if they are reusable that will cut my cost down a bunch.

[FordNut]

I wouldn't use stock pistons or rods.

[Thenwhat85]

Coyote rods are the same dimensions as 4.6 rods the coyote pistons are a bigger bore. And the cranks are different but fix exact same only stronger still powered metal but stang guys are pushing 700 without failure

[RubberCtyRauder]

I see that they are the same now after some research

[Bradley G]

ring lands failures on stock pistons are a prevalent.especially when you turn up the wick.

[jsignorelli]

What are "stock engine" parts?

[Mr. Man]

I know why the connecting rods are not up to the task of high HP. I'm told they are brittle. What is the issue with the pistons?

[FordNut]

I know why the connecting rods are not up to the task of high HP. I'm told they are brittle. What is the issue with the pistons?

this has happened quite a bit...


ring lands failures on stock pistons are a prevalent.especially when you turn up the wick.

[RubberCtyRauder]

I know why the connecting rods are not up to the task of high HP. I'm told they are brittle. What is the issue with the pistons?

i believe they are powdered metal as well

[376shovel]

The rods I bought are out of a 2013 boss 302. They are even stronger than the early 5.0 rods. Perfectly fine for my basically stock rebuild.

[FordNut]

i believe they are powdered metal as well

They are hypereutectic. Very hard but they break under detonation, even without boost.

[RubberCtyRauder]

They are hypereutectic. Very hard but they break under detonation, even without boost.

yes, i remember now. thanks

[Blackmobile]

Stock 03 Piston:
http://www.mercurymarauder.net/gallery/data/69/deadpiston.JPG (http://www.mercurymarauder.net/gallery/showphoto.php/photo/13633/title/deadpiston/cat/69)

Need to know anything else?

[FordNut]

Stock pistons are ok for a stock engine and factory tune.

[lifespeed]

Ok cool. I actually just read the stock Pistons are floating. Did not know that. Good to know. I will check these pistons out and if they are reusable that will cut my cost down a bunch.


The rods I bought are out of a 2013 boss 302. They are even stronger than the early 5.0 rods. Perfectly fine for my basically stock rebuild.

It would be a shame to re-use the stock pistons when you have it torn down and already have good rods. Put some good pistons in and gap the piston rings for boost. These engines can run for many miles, years later when you're ready for the supercharger you don't have to tear it apart again. Of course it's easy for me to spend your money ;)

[Seneca]

The rods I bought are out of a 2013 boss 302. They are even stronger than the early 5.0 rods. Perfectly fine for my basically stock rebuild.

I'm going to run a set of the boss rods in a 2v build I'm doing, they're nice rods for the price, mines an n/a application not all that much stress

[376shovel]

It would be a shame to re-use the stock pistons when you have it torn down and already have good rods. Put some good pistons in and gap the piston rings for boost. These engines can run for many miles, years later when you're ready for the supercharger you don't have to tear it apart again. Of course it's easy for me to spend your money ;)


Yes this all makes sense, but my goal was to evaluate the cost benefit analysis and try to error on the side of cheap. I really want to spend my money on my Chevelle since that is my go fast item, but each part I buy for this engine leads me further down a rabbit hole and before I know it I have $4,000 tied up in a basically stock engine. Which makes me very sad.

[mm svt]

4 is forged internals, timing components and gaskets no arp, no head work or machine shop fees

[massacre]

Yes.im going to be doing the same thing but I got some good used terminator pistons to use also so the rotating assembly should take 600hp all day reliably

Stock Terminator pistons are nothing special FYI
In fact the non forged pistons are the weak link in those motors.

[Turbov6Bryan]

Stock Terminator pistons are nothing special FYI
In fact the non forged pistons are the weak link in those motors.

Then how are a select few getting 1000 rwhp on factory terminator shortblock when running turbos, or a turbo?

Mahle right?

[376shovel]

4 is forged internals, timing components and gaskets no arp, no head work or machine shop fees


I bought the motor for $750 corrected cost after partial refund. $190 for the rods. Quoted $1100 for machine work and valve job. $600-700 pistons and rings. I paid $500 for timing components, gaskets and oil pump. $225 for bearings, head gaskets and bolts.

Putting it together myself that puts me at $3465 +-.

Right now I'm already in on everything except machine work and pistons.

[massacre]

Then how are a select few getting 1000 rwhp on factory terminator shortblock when running turbos, or a turbo?

Mahle right?

Well I know a lot of terminator guys that have broken those Mahle pistons/ring lands but none that have broken rods or crank. It's the weak link in those particular motors.

Also tune has a ton to do with power and how it is safely made.

[FordNut]

I bought the motor for $750 corrected cost after partial refund. $190 for the rods. Quoted $1100 for machine work and valve job. $600-700 pistons and rings. I paid $500 for timing components, gaskets and oil pump. $225 for bearings, head gaskets and bolts.

Putting it together myself that puts me at $3465 +-.

Right now I'm already in on everything except machine work and pistons.

If you're in that deep, why not get some better pistons?

And beehive valve springs from Comp Cams, since the heads are going to be apart for rebuild. Then adding hotter cams with higher lift in the future would be a simple bolt-in.

[justbob]

FWI Brian Tooley Racing valve springs are the exact same specs as Comps IIRC at half the price.

I've had them for four years now and not a single issue.


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[376shovel]

FWI Brian Tooley Racing valve springs are the exact same specs as Comps IIRC at half the price.

I've had them for four years now and not a single issue.


Sent from my iPhone using Tapatalk

Can you send a link to that?

[Blackmobile]

Here is a comparison of stock against CP pistons

http://www.mercurymarauder.net/gallery/data/69/cpringland.JPG (http://www.mercurymarauder.net/gallery/showphoto.php/photo/13632/title/cpringland/cat/69)

[justbob]

https://www.briantooleyracing.com/500-lift-ford-4v-modular-springs.html

They were $199 when I bought them. I see they went up to $249.


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[FordNut]

Here is a comparison of stock against CP pistons

http://www.mercurymarauder.net/gallery/data/69/cpringland.JPG (http://www.mercurymarauder.net/gallery/showphoto.php/photo/13632/title/cpringland/cat/69)

CP can also be ordered with teflon coated skirts. And ceramic coated tops.