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  Home > Pistons > Probe Forged Pistons > PRS - Professional Race Series > Chevrolet > Chevrolet - 400 Small Block > Dish Top >

Probe Forged Pistons_PRS Series_Chevrolet 421_Dish_1.077 C/H_4.125 Base Bore_-20.5cc_.927 Pin_23d Wedge Head_Gas Ported
Probe Forged Pistons

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Available Part Numbers/Oversize

8022-2-14889-000 - 4.125
8022-2-14889-020 - 4.145
8022-2-14889-030 - 4.155
8022-2-14889-040 - 4.165
8022-2-14889-060 - 4.185


Probe Industries Professional Race Series Forged Pistons are designed for extreme performance street and all racing applications. They are available in a wide variety of designs, tuned to achieve the highest performance possible. Any combination from high performance street to heavily boosted race only cars will find Probe PRS Series Forged Pistons to be the perfect piston for virtually any application.
  • 2618-t61 Forged Aluminum
  • Lightweight piston designs
  • 52100 bearing steel wrist pins
  • Full floating
  • Tight running clearances
  • Low friction narrow piston rings
  • Top or lateral gas ports
  • Dual forced and broached pin oilers
  • Low drag skirt design
  • Large variety of compression ratios
  • Design specific valve reliefs
  • Nitrous - 400 H/P
  • Forced Induction - 20 lbs
  • Four (each) minimum order quantity
Custom sizes and applications are also available. Additional cost and manufacture times may apply.
Allow approximately 6 weeks for manufacture. Delivery times may vary seasonally.



Add a Total Seal Performance Ring Set......click here

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Item# Item Name Price Qty Add
8022-2-14889-000 PRS Pistons_Chevrolet 414_Dish_4.125 Bore_-20.5cc
$1,595.00
8022-2-14889-020 PRS Pistons_Chevrolet 418_Dish_4.145 Bore_-20.5cc
$1,595.00
8022-2-14889-030 PRS Pistons_Chevrolet 421_Dish_4.155 Bore_-20.5cc
$1,595.00
8022-2-14889-040 PRS Pistons_Chevrolet 422_Dish_4.165 Bore_-20.5cc
$1,595.00
8022-2-14889-060 PRS Pistons_Chevrolet 426_Dish_4.185 Bore_-20.5cc
$1,595.00
Check the items you wish to purchase, then click


Technical Specs:
Item Code8022-2-14889
VendorProbe Industries
Product TypePistons
Product ModelProfessional Race Series - PRS
Nitrous400 H/P
Forced Induction20 lbs
Engine Displacement421
Engine FamilyChevrolet 400 Small Block
Material2618-t61
Base Bore4.125
Stroke3.875
Rod Length6.000
Compression Height1.077
Top TypeDish
Net Piston Volume-20.5
Minimum Deck Thickness.200
Valve Pocket Location23d Wedge
Valve Pocket Cutters2.200 Intake - 1.900 Exhaust
Valve Pocket Depth.300 Intake - .200 Exhaust
WeightTBA
Wrist Pin Type52100 Bearing Steel
Wrist Pin Diameter.927
Wrist Pin Length2.300
Wall ThicknessPer Application
Wrist Pin WeightPer Application
Pin OilersForced
Pin Lock TypeDouble Spiral
Oil Support RailNo
Rings IncludedNo
Ring Grooves1.2 - 1.2 - 3.0
Gas PortsVertical or Lateral
Gas Port Size10 to 12 - .062 drill
Ring Lands.245 - .180 - .080
QuantitySold in sets of 8
Minimum Order Quantity4 (each)
Notes




Compression Ratio:
Cylinder Head Volume
Part Number Net cc 58cc 64cc 68cc 72cc
8022-2-14889-000 -20.5 10.45 9.86 9.51 9.18
8022-2-14889-020 -20.5 10.54 9.95 9.59 9.26
8022-2-14889-030 -20.5 10.59 9.99 9.63 9.29
8022-2-14889-040 -20.5 10.63 10.03 9.67 9.33
8022-2-14889-060 -20.5 10.72 10.11 9.75 9.41
Computed with .010 deck and .040 x 4.200 gasket

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