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  Home > Pistons > Probe Forged Pistons > PRS - Professional Race Series > Ford > Ford 302 Windsor > Flat Top >

Probe PRS Series Forged Pistons_Ford 331_Flat_1.165 C/H_4.000 Base Bore_-4.0cc_.912 Pin_Twisted Wedge Head_Gas Ported
Probe Forged Pistons

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Available Part Numbers/Oversize

8000-1-65261-030 - 4.000
8000-1-65261-040 - 4.030
8000-1-65261-060 - 4.040

Probe PRS Series Forged Pistons

Probe Industries Professional Race Series Forged Pistons are designed for high 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 - to 300 H/P
  • Forced Induction - 15 lbs
  • Four (each) minimum order quantity
Custom sizes and applications are also available. Additional cost and manufacture times may apply.
Allow approximately 14 business days for manufacture.



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

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Item# Item Name Price Qty Add
8000-1-65261-000 PRS Pistons_Ford 327_Flat_4.000 Bore_-4.0cc
$1,300.00
8000-1-65261-030 PRS Pistons_Ford 331_Flat_4.030 Bore_-4.0cc
$1,300.00
8000-1-65261-040 PRS Pistons_Ford 333_Flat_4.040 Bore_-4.0cc
$1,300.00
Check the items you wish to purchase, then click


Technical Specs:
Item Code 8000-1-65261
Vendor Probe Industries
Product Type Pistons
Product Model Professional Race Series - PRS
Nitrous 300 H/P
Forced Induction 15 lbs
Engine Displacement 331
Engine Family Ford - 302 Windsor
Material 2618-t61 Forged Aluminum
Base Bore 4.000
Stroke 3.250
Rod Length 5.400
Compression Height 1.165
Top Type Flat Top
Net Piston Volume -4.0
Minimum Deck Thickness .180
Valve Pocket Location Twisted Wedge Head
Valve Pocket Cutters 2.200 Intake - 1.700 Exhaust
Valve Pocket Depth .200 Intake - .175 Exhaust
Weight TBA
Wrist Pin Type 52100 Bearing Steel
Wrist Pin Diameter .912
Wrist Pin Length 2.300
Wall Thickness .150
Wrist Pin Weight 107
Pin Oilers Forced/Broached Combination
Pin Lock Type Double Spiral
Oil Support Rail No
Rings Included No
Ring Grooves .043 - .043 - 3.0
Gas Ports 10 to 12 - .062 drill
Ring Lands .220 - .140 - .075
Quantity Sold in sets of 8
Minimum Order Quantity 4 (each)
Notes Fits Twisted Wedge Head




Compression Ratio:


Cylinder Head Volume
Part Number Net cc 58cc 61cc 64cc 72cc
8000-1-65261-000 -4.0 10.16 9.80 9.47 8.69
8000-1-65261-030 -4.0 10.28 9.92 9.58 8.79
8000-1-65261-040 -4.0 10.32 9.95 9.61 8.82
Computed at .010 deck and .041 gasket



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Pistons > Probe Forged Pistons > PRS - Professional Race Series > Ford > Ford 302 Windsor > Flat Top
Pistons > Probe Forged Pistons > PRS - Professional Race Series > Ford > Ford 302 Windsor > Flat Top > Twisted Wedge Head