Forged 3.4 DOHC Pistons

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Forged 3.4 DOHC Pistons

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Product Information

These Diamond Forged Pistons have the valve reliefs already taken care of, and stick out of the block .015".  This allows for better quench and allowing for 7000+ RPM operation.  We have 2 ring groove options, which determine the ring options.  Stock grooves allows for a Mahle Premium Ring Set to be used at best (which is good for most applications)   For the best ring options, we use a 1.5/1.5/3.0 groove set for Total Seal rings. These are to a custom depth to match a more popular engine's piston, giving us better options that won't disappear like our factory 1.2mm top ring.

Pistons are a 2618 Alloy, designed with the clearance in mind for the bore size specificed.  We recommend measuring the pistons before the block is bore/honed to be certain of final clearances.  SBC size ( .927") 4130 pins come standard with each set.  Aftermarket rods are required with these pistons.  Top ring location compared to the crown is determined by application. 

Compression is based on 3.4 DOHC heads and stock .060" thick head gasket. 

Optional Upgrades


  • Skirt coating to reduce friction.  This is common for even stock replacement pistons and highly recommended
  • Thermal coating to crown to reduce heat transfer and keep the energy in the combustion chamber. 
  • Double Diamond hard anodize with skirt coating.  Our choice for max effort builds. 

Pin Upgrade

  • H13 Tool Steel with increased wall thickness compared to our standard pin.  Highly recommended for max effort engines.


  • Double Pin Oilers (Banana Groove).  Similar principle as an oil squirter, but using the natural motion of the engine to throw oil under the piston
  • Maxi-Lite internal mill.  As it sounds, reduces weight from the piston where it isn't necessary for strength.  This is great for high RPM.

Piston Rings

  • Mahle Premium Steel Ring Set
    • Carbon Steel First and Second
    • Stainless Oil Control Ring
    • Plama Moly Coated Top Ring
  • Total Seal Advanced Profile Steel Ring Set
    • Manufactured from 440B stainless steel
    • Stronger, Longer life and Most Precise Tolerances
    • Saves money (fewer teardowns)
    • Thinner, Flatter and Lighter
    • Conforms Better to the Cylinder Wall
    • Works well in all applications, notably dirt environments
    • Easier on cylinders, reducing bore wear
    • Uses C33 face coating: doesn't allows dirt to penetrate coating
    • Available in Gapless or Conventional
  • Total Seal Gapless Top Ring option reduces blowby, increasing power slightly.
  • Total Seal Napier 2nd Ring option improves oil control, and is recommended for all applications. Highly recommended for forced induction applications.

Piston Ring Groove

  • Depends on ring set to be used.  If no rings are purchased, this will be default as stock 60V6 grooves unless the 1.5/1.5/3.0 option is selected.  With ring purchase, grooves will be matched based on ring choice.
Product CodeDF34DOHCPistons

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