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Old 10-01-2013, 08:37 PM   #1
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4.2 help

Bored the block .30 over... Not sure if the 4.2 pistons will work now, and don't have the $$$ to get custom or forged...

---------- Post added at 07:37 PM ---------- Previous post was at 07:34 PM ----------

4.2 1998 block and crank bored and honed .30 over. New balance shaft bearings, new cam shaft bearings, new freeze plugs -stock returnless fuel rail -stock ported heads with ls1/ls6 blue valve springs, 2inch valve intake, 1.6 valve exhaust, new seals and seats, stock ls1 7 degree keepers, unshrouded valves -99+ windstar with ported lower with imrc and egr delete. This is my current setup..
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Old 10-01-2013, 09:13 PM   #2
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Bored the block .30 over... Not sure if the 4.2 pistons will work now, and don't have the $$$ to get custom or forged... ---------- Post added at 07:37 PM ---------- Previous post was at 07:34 PM ---------- 4.2 1998 block and crank bored and honed .30 over. New balance shaft bearings, new cam shaft bearings, new freeze plugs -stock returnless fuel rail -stock ported heads with ls1/ls6 blue valve springs, 2inch valve intake, 1.6 valve exhaust, new seals and seats, stock ls1 7 degree keepers, unshrouded valves -99+ windstar with ported lower with imrc and egr delete. This is my current setup..
Pistons won't work if you bored it .030 you need .030 over pistons
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Old 10-01-2013, 09:22 PM   #3
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lol your building an engine without common sense... damn

---------- Post added at 08:22 PM ---------- Previous post was at 08:19 PM ----------

also there not freeze plugs there just core plugs
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Old 10-01-2013, 09:44 PM   #4
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lol your building an engine without common sense... damn

---------- Post added at 08:22 PM ---------- Previous post was at 08:19 PM ----------

also there not freeze plugs there just core plugs
It's actually "you're" just saying, and I'm using common sense. I said I was unsure, so I came on here to get a 100% correct answer. Negativity isn't needed lol constructive criticism is welcome
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Old 10-02-2013, 07:39 AM   #5
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I just messed up the motor in my pony. So I'm looking in to this build myself. I'm pretty sure that the bore being .30 over you will need pistons that are .30 over size. Being that the3.8 and 4.2 pistons will swap stock to stock. i planned on boring mine out but I'm like you i don't want to have to pay for custom ones. best of luck to you on your build. If find any pistons let me know that help on my own build.
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Old 10-02-2013, 12:06 PM   #6
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Advanced sells oversized piston sets for $338. Not sure of what bore for oversize try are though.
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Old 10-04-2013, 04:44 AM   #7
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Yeah stock pistons will work, for about 2 minutes, then they turn sideways and start punching the head
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Old 10-04-2013, 01:05 PM   #8
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You can buy oversized pistons for the same price as normal pistons. No need for that custom stuff.
My engines bored 30 over.
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Old 10-06-2013, 03:58 PM   #9
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You can buy oversized pistons for the same price as normal pistons. No need for that custom stuff.
My engines bored 30 over.
Where did you get yours??
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Old 10-06-2013, 05:23 PM   #10
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Because ideally, I'd want a 10.5:1 compression ratio
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Old 10-06-2013, 05:27 PM   #11
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Yeah stock pistons will work, for about 2 minutes, then they turn sideways and start punching the head
David, you're an *** filled with knowledge XD
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Old 10-07-2013, 02:37 AM   #12
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I bought grumpys brand pistons. Some store in Oregon that sells stuff on ebay .
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Old 10-08-2013, 01:08 PM   #13
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I'm talking with Tom M about getting stock pistons and rods, I don't wanna cheap out but I want them from people the specificly work on the v6s. I have another question though, where do I find gaskets that will fit the port job??
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Old 10-08-2013, 01:43 PM   #14
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Originally Posted by ProjectTurboV6 View Post
I'm talking with Tom M about getting stock pistons and rods, I don't wanna cheap out but I want them from people the specificly work on the v6s. I have another question though, where do I find gaskets that will fit the port job??
You don't match gasket to port, you match port to the gasket.. Any stock gaskets should work, if not they screwed up the port work
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BV heads, P&P lower, comp 218/226 cam, 4.2 bottom end, 3k stall, flow 40's, O/R x-pipe, Pacesetter lt's, SCT xcal2 (93 Ortizperformance tune), Windstar upper, 65mm tb, CAI, 8.8 w/ 3.73's, SFC's, cut springs, KYB shocks/struts, MM LCA's
blower/new cam soon
Dealer for Ortiz Performance, great tunes at a good price!
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Old 10-08-2013, 01:48 PM   #15
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You don't match gasket to port, you match port to the gasket.. Any stock gaskets should work, if not they screwed up the port work
Note taken, thank you!
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Old 10-10-2013, 04:06 AM   #16
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Originally Posted by ProjectTurboV6 View Post
I'm talking with Tom M about getting stock pistons and rods, I don't wanna cheap out but I want them from people the specificly work on the v6s. I have another question though, where do I find gaskets that will fit the port job??
Stock pistons won't work if its bored over.
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