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Diamond Pistons Competition Series Pistons 11505-R1
Part Number: DPP-11505-R1
Diamond Pistons Competition Series Pistons
Comp Series LS FT 3.905B/4.000S/6.125R/1
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Estimated Ship Date: Dec 7, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
11505-R1
Part Type:
Product Line:
Summit Racing Part Number:
DPP-11505-R1
UPC:
193564373076
Piston Rings Included:
Yes
Bore (in.):
3.905 in.
Bore (mm):
99.187mm
Stroke:
4.000 in.
Engine Stroke Type:
Stroked
Actual Engine Displacement:
6.3L/383
Rod Length:
6.125 in.
Piston Style:
Flat top, with two valve reliefs
Piston Material:
Forged aluminum
Compression Height (in.):
1.115 in.
Piston Head Volume (cc):
+2.00cc
Wrist Pin Style:
Floating
Wrist Pin Retainers Included:
Yes
Wrist Pin Included:
Yes
Pin Diameter (in.):
0.927 in.
Piston Ring Thickness:
1.20mm x 1.50mm x 3.00mm
File Fit:
Yes
Gapless:
No
Top Ring Thickness:
1.2mm
Top Ring Material:
Steel
Top Ring Facing Material:
Gas nitrided
Second Ring Thickness:
1.5mm
Second Ring Material:
Ductile iron
Second Ring Facing Material:
Ductile iron
Oil Ring Thickness:
3.0mm
Oil Ring Material:
Stainless steel
Oil Ring Tension:
Standard
Remanufactured:
No
Quantity:
Sold individually.
Notes:
Pistons are 2618 material.
Diamond Pistons Competition Series Pistons
Diamond Pistons Competition Series pistons are for those looking to take their engine to a whole new level of power. These forged aluminum pistons are superior in strength and provide extra protection during the high-stresses of high-compression, forced induction, or nitrous.
Diamond Pistons Competition Series features:
* 3D milling on piston crowns for "ready-to-install" finish
* Generous valve pockets designed to work with stock or oversized valves and various cylinder heads
* Constructed from forged 4032 or 2618 aluminum alloy (where specified)
* Premium 8620 or H-13 steel wrist pins (where specified)
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Some parts are not legal for use in California or other states with similar laws / regulations
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