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Old February 25th, 2014, 09:52 AM   #1
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Default 4.5 stroker

Finally have the money to rebuild my 4.0 and well I'm in there I want to add a few more ponies. Looking at getting a 258 crank and rods. Do I need to get new pistons to keep the quench height favorable? Do I need anything else? Is getting .020-.030 bored over pistons worth it?

I want to maintain 87-89 octane

Thanks for the help!
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Old February 25th, 2014, 10:11 AM   #2
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I don't know for certain but it seems like people keep the stock pistons. But I don't know for sure. I was wondering the same thing
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Old February 25th, 2014, 10:20 AM   #3
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Wait when did you get monies
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Old February 25th, 2014, 10:25 AM   #4
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#inbeforethethreadgoesnowhereliketherest
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Old February 25th, 2014, 10:26 AM   #5
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Originally Posted by 2fst4you View Post
Finally have the money to rebuild my 4.0 and well I'm in there I want to add a few more ponies. Looking at getting a 258 crank and rods. Do I need to get new pistons to keep the quench height favorable? Do I need anything else? Is getting .020-.030 bored over pistons worth it?

I want to maintain 87-89 octane

Thanks for the help!
I want to make power but I don't want to spend 6% more on fuel
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Old February 25th, 2014, 10:28 AM   #6
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i am currently collecting parts for a stroker, I was hoping this thread didnt get derailed so quickly haha


I am going to use a 258 crank and rods and get 6 over pistons and bore my current motor. I have heard with a mild stroker build you can compensate the computer programming aspect of it with mustange injectors and a adjustable fuel pressure regulator.

Its all french to me.

what machine shop are you using
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Old February 25th, 2014, 10:35 AM   #7
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Will this be done before Silver Lake?
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Old February 25th, 2014, 10:38 AM   #8
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I just did this I used a 258 crank and rods with speed pro 4.0 pistons bored 30 over I used a mild crane cam. And mustang 24lb injectors I am still using pump gas. But I have around 1500 in the motor that is all parts and machine work on the block, crank , and head
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Old February 25th, 2014, 10:45 AM   #9
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Wait when did you get monies
Taxes and I'm going to start working with my uncle

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Originally Posted by feva4u View Post
I want to make power but I don't want to spend 6% more on fuel
I already put premium in my car don't want to have to put it in my jeep and its more money to build a stroker requiring 93. I just want a mild stroker

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Originally Posted by hosejockey4506 View Post
i am currently collecting parts for a stroker, I was hoping this thread didnt get derailed so quickly haha


I am going to use a 258 crank and rods and get 6 over pistons and bore my current motor. I have heard with a mild stroker build you can compensate the computer programming aspect of it with mustange injectors and a adjustable fuel pressure regulator.

Its all french to me.

what machine shop are you using
That sounds correct. Not sure yet about to start collecting parts

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Will this be done before Silver Lake?
Yes

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I just did this I used a 258 crank and rods with speed pro 4.0 pistons bored 30 over I used a mild crane cam. And mustang 24lb injectors I am still using pump gas. But I have around 1500 in the motor that is all parts and machine work on the block, crank , and head
What octane are you running? How much was the cam?
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Old February 25th, 2014, 10:56 AM   #10
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#inbeforethethreadgoesnowhereliketherest
Lolz pretty much...
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Old February 25th, 2014, 11:00 AM   #11
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I already put premium in my car don't want to have to put it in my jeep and its more money to build a stroker requiring 93. I just want a mild stroker
How?
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Old February 25th, 2014, 11:25 AM   #12
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If you dont have to bore the block and can use stock pistons it can b fairly cheap and run on 87 oct fuel.
some 4.0l heads do hot spot in the combustion chamber. Often polishing the head in the top of the combustion chamber around the valves can help. Get it nice and smooth, with out removing too much material. Piston quench height needs to be set correctly for it to run well. Thicker and thinner head gaskets are avialable. U can also shve the head or deck the block if necessary.
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Old February 25th, 2014, 11:31 AM   #13
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Old February 25th, 2014, 11:43 AM   #14
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Get a louder exhaust and you will feel faster.
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Old February 25th, 2014, 11:50 AM   #15
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How?
x2
How is it more money to build one that requires 93?
How much will you drive this?
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Old February 25th, 2014, 12:03 PM   #16
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How?
Maybe I'm wrong just figured boring it more and running bigger pistons would cost more

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If you dont have to bore the block and can use stock pistons it can b fairly cheap and run on 87 oct fuel.
some 4.0l heads do hot spot in the combustion chamber. Often polishing the head in the top of the combustion chamber around the valves can help. Get it nice and smooth, with out removing too much material. Piston quench height needs to be set correctly for it to run well. Thicker and thinner head gaskets are avialable. U can also shve the head or deck the block if necessary.
The plan is keeping the stock pistons if possible if not I guess I'll bore .020-.030 over

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Get a louder exhaust and you will feel faster.
Wish that helped lol

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x2
How is it more money to build one that requires 93?
How much will you drive this?
See above. A few days during the summer besides that its for wheeling only
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Old February 25th, 2014, 12:22 PM   #17
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Pistons aren't the only factor in octane requirements. Cam choice also plays a large part in this (if you're considering a cam swap).
If you have to bore the cylinders, you have to get new pistons anyway. Unless you're buying some custom units, I don't see where something with a little more compression is going to add much (if any) to your build. Add the fact that worse case scenario, you have to deck the block or mill the heads to achieve a flat surface... You may end up with more than you want anyhow.
If you're only going to use this for what you're saying, I can't see how it's worth putting a lot of time/effort into something so you can run fuel that's $.10 cheaper a gallon?
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Old February 25th, 2014, 02:09 PM   #18
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Pistons aren't the only factor in octane requirements. Cam choice also plays a large part in this (if you're considering a cam swap).
If you have to bore the cylinders, you have to get new pistons anyway. Unless you're buying some custom units, I don't see where something with a little more compression is going to add much (if any) to your build. Add the fact that worse case scenario, you have to deck the block or mill the heads to achieve a flat surface... You may end up with more than you want anyhow.
If you're only going to use this for what you're saying, I can't see how it's worth putting a lot of time/effort into something so you can run fuel that's $.10 cheaper a gallon?
I don't plan on changing the cam. I want to do 258 crank and rods and stock 4.0 pistons. If I do bore over it will be .020-.030 and id like to avoid high CR so I can run 87. If that's not possible ill live with running higher octane
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Old February 25th, 2014, 02:15 PM   #19
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I want to know if you fell out of the same tree as skooterbuilt.
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Old February 25th, 2014, 02:20 PM   #20
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i have 200 in a cam and lifters and i am running 93 right now have not tried running 87-89 yet. i have 200 in boring the block, instaling new cam bearings and hot tanking the block. 150 in the head which incudes valve job and decking the head to insure it was straight. 200 in the cank that was turning it to .10 to .10 on main and rod journals and makeing sure it was straight. 80 in injectors from ebay 200 for pistons,rings,and cam bearings. 100 in main and rod bearings and 90 in a oil pump. if u are gonna do a rebuild i would most defintly put new cam bearings in it. if i wereto do it all over again i would save the moiney fro the stroker and just go 5.3 in it. or find a good running 4.0
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