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  • 1996 - 2004 SN95 Mustang -General/Talk-

Help with valve relief notches in pistons

  • Thread starter Thread starter Adizzle843
  • Start date Start date Sep 1, 2020

Adizzle843

Active Member
Mar 22, 2020
83
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28
South Carolina
Sep 1, 2020
#1
  • Sep 1, 2020
  • #1
Guys, need some help. I didn’t notice this until after I got the pistons in, 6 of the pistons have the notch cut at about 9:30 and the other 2 have the cuts at 180 degrees off. They are Manleys forged pistons from MMR, and are all labeled which direction is forward.
Did MMR mess up the machine work, or do these have a a specific location.
Does it matter if I flip them over and run them with the forward arrow facing backwards?
The pics attached aren’t great but it’s the best I could get.
 

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Adizzle843

Active Member
Mar 22, 2020
83
30
28
South Carolina
Sep 1, 2020
#2
  • Sep 1, 2020
  • #2
Adizzle843 said:
Guys, need some help. I didn’t notice this until after I got the pistons in, 6 of the pistons have the notch cut at about 9:30 and the other 2 have the cuts at 180 degrees off. They are Manleys forged pistons from MMR, and are all labeled which direction is forward.
Did MMR mess up the machine work, or do these have a a specific location.
Does it matter if I flip them over and run them with the forward arrow facing backwards?
The pics attached aren’t great but it’s the best I could get.
Click to expand...
Ok I just realized I’m a ing idiot. That being said, do the notches go to the top of the piston or the bottom?
 
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