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Diamond 30809 - 5.8L Shelby Series Piston / Ring Kit -13.5cc Dish, 3.650" Bore

10.0:1 Compression - Supplied with AP Steel Ring Set - Designed for Sleeved Blocks
Limited Supply: only 1 remaining
Was: $1,060.99
Sale: $1,029.16
Save: 3%
Save: $31.83
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Diamond's all new 5.8L Trinity Shelby Series Pistons feature a much taller compression height to bring the Piston closer to the deck. This drastically improves combustion efficiency and flame travel while allowing the rings to be spaced out for additional strength. These Pistons are designed to be used in a 5.8L Block that has been sleeved.


  • 2618 Alloy Forging for High HP Applications
  • .320" Down Top Ring Land 
  • .151" Intake / .050" Exhaust Valve Reliefs 
  • Moly Coated Skirts
  • Total Seal AP Steel Piston Ring Set - Napier 2nd Rings 

Compression Ratio: 10.0:1
Compression ratio calculated with 3.700" Bore / .036" Compressed Thickness


Part Number   30809
Piston Material   2618 Aluminum Alloy 
Fitment   Ford 5.8L Trinity - Factory Spray in Liner 
Piston Volume  -13.5cc  
Bore  3.650" 
Stroke  4.165"  
Rod Length  6.657" 
Compression Height  1.315" 
Wrist Pin Dimesions .866" x 2.500" x .180" Wall 
Wrist Pin Material  8620 Alloy
Included Piston Ring Set  09523650
Piston Ring Stack  1.2mm x 1.5mm x 3.0mm 
Piston Ring Specifications  AP Steel Top, Napier 2nd, 3 Piece Stainless Oil 

H-13 Wrist Pin upgrade suggested for applications over 800 HP 



Shipping Information

  • Item Requires Shipping
  • 14.0 lbs.
  • W28.0000” x H12.0000” x L6.0000”
  • Free Shipping!

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