Would these Forged Pistons work with a 4.2L block? - Mustang Evolution

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Old 06-21-2004, 10:36 AM   #1
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Would these Forged Pistons work with a 4.2L block?

http://cgi.ebay.com/ebaymotors/ws/eB...category=33623
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Old 06-21-2004, 10:47 AM   #2
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yes. i think just the pistons though. I think you would need to change the rods.
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Old 06-21-2004, 10:51 AM   #3
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Thanks
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Old 06-21-2004, 11:39 AM   #4
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if your going to buy these you better put themin yourself because a mechanic will rape you with labor costs
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Old 06-21-2004, 11:44 AM   #5
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yea I want to tackle most of this myself. (Myself being SpectorV and a few others lol)
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Old 06-21-2004, 11:53 AM   #6
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thats cool then that you have buddys that will help you
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Old 06-21-2004, 11:54 AM   #7
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i see youve posted alot about ebay performance parts for your mustang thinking of getting them all at once
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Old 06-21-2004, 12:07 PM   #8
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Hey Brent I said I would come to Huntsville and help you build your motor. I put the MOJO on it.

By the way those pistons might work but like monkey said the rods are tossers. If they are forged sell them.

Now on the problem with pistons height. You need to find out the height of the piston from the center of the pin hole to the top of the piston. If I remember when I was going to build a 4.2, the piston height might be different which will require the piston to be shaved or milled if they are to tall so you dont have clearance problems.
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Old 06-21-2004, 01:18 PM   #9
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Alright basically just getting information now. I might buy those brakes ina week or two. There are alot of similar auctions for the same kind of brakes so I am sure they will be around after I get all my current mods installed.

When RGR gets back I want to talk to him and possibly drive to SC to get a 4.2L from him. I need to talk to him badly!! lol
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Old 06-21-2004, 02:13 PM   #10
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You would also want to find out if the pistons are for floating pins or are for press fit pins. I cant really tell from the pic. If they are press fit your local machine shop will charge you too press them out for new rods.
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Old 06-21-2004, 02:16 PM   #11
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Quote:
Originally Posted by lucky13
You would also want to find out if the pistons are for floating pins or are for press fit pins. I cant really tell from the pic. If they are press fit your local machine shop will charge you too press them out for new rods.
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Old 06-21-2004, 02:22 PM   #12
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Brent could send them to me and I would press them out and new ones in for free!!!!!
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Old 06-21-2004, 02:30 PM   #13
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Well I dont want to buy them now until I talk to Robert.
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Old 06-21-2004, 02:31 PM   #14
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but I really do want to drive up there and get the 4.2L and have it put in while up there.
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Old 06-22-2004, 11:40 AM   #15
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Actually, I'm almost 100% positive those pistons won't work. You can try, but I'm gonna say no. You can get some stock 4.2 pistons for a little cheaper. The exact price, i don't know but I can find out. The 4.2 pistons are pretty tough from what I've seen so far. I know of about 5 people running the stock pistons and no problems, some even run with boost. Just something to think about, and also stock 9.2~9.3 is the stock compression ratio. A Little easier on the block
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Old 06-22-2004, 02:08 PM   #16
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One of those pistons is new
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Old 06-22-2004, 02:19 PM   #17
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The second one from the left?
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Old 06-22-2004, 04:06 PM   #18
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