4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

Do these used forged pistons look ok?

Old Oct 22, 2009 | 12:21 PM
  #1  
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Default Do these used forged pistons look ok?








the price is very resonable, seller says "they are .020 over bore.. 18cc dished boost ready.. comes with speed pro steal rings.. and all wrist pins..
they have 45 minutes of running time.all on the dyno. put them in and had some timing issues so 2 pistons have valve marks on it.. but they still look brand new... i didnt feel like messing with it so i sold the car after i took the pistons out.."

should i pass or take? yes im on a budget
Old Oct 22, 2009 | 01:59 PM
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If 2 of the pistons have valve marks on them, i wouldnt buy them. Just my opinion.
Old Oct 22, 2009 | 02:00 PM
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They look good, but I don't really know what to look for. I got DSS rods and pistons with ARP rod bolts for $470 shipped, although they had 1000 miles on them.
Old Oct 22, 2009 | 02:07 PM
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I wouldn't buy them.......no matter what the price was. If there are marks, the pistons could have hairline cracks internally that the naked eye can't see. Those cracks expand under heat/pressure, and could potentially cause a lot more $$$ worth of problems when the break. Don't skimp on pistons/rods.

Good luck,
Derrick
Old Oct 22, 2009 | 02:59 PM
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^+1

you'll never truly know until its too late...
Old Oct 22, 2009 | 03:43 PM
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Yes, and even if they dont, those crevices invite detonation.
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