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You are here: Home > Stroker Kits > Ford - 302 Windsor > 331 Cubic Inches - 3.250 Stroke > Flat Top
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20° Standard Wedge Twisted Wedge Twisted Wedge 11R

Flat top pistons in a 331 inch Ford engine will generally provide compression ratios in the 10.0:1 range which makes them a good option for engines with aluminum heads or larger cc iron heads. 450 Horsepower (flywheel) levels are typical with aftermarket heads and camshafts. Valve reliefs are configured to work with most types of standard and aluminum cylinder heads and will normally fit camshafts to slightly over .600 valve lift.

Villain - Cast Crank, through-bolt rods, forged pistons, designed for stock replacement and mild performance applications.

Vigilante - 4340 Forged Crank, I-Beam rods, forged pistons, designed for Street or Street and Strip performance applications.

Vindicator - 4340 Forged Crank, H-Beam rods (ARP-2000), custom forged pistons designed for serious Street or all out Strip applications.

Vanquisher - 4340 Forged Crank, H-Beam rods (ARP-2000), custom forged pistons designed for serious Street or all out Strip applications. All components are Made in the USA.
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Probe Villain Engine Kit
Villain Engine Kit_Ford 331_5.400 Rod_Flat_-7.0cc_External_STD Wedge Head

P/N: 9000-11002
  • Valve Pockets for Standard Wedge Heads
  • Wiseco PTS 4032 Forged Pistons-1.165 C/H
  • Probe 3.250 Stroke Cast Steel Crankshaft
  • Probe 5.400 ctc Machined Beam 5140 Steel Rods
  • ARP 8740 Through Bolts
  • External Balance (28 oz)
  • Components rated at 550 Horsepower
Available Bore Sizes: 4.030, 4.040 more info
Probe Vigilante Engine Kit
Vigilante Engine Kit_Ford 331_5.400 Rod_Flat_-7.0cc_External_Twisted Wedge Head

P/N: 9100-61007
  • Valve Pockets for Twisted Wedge Heads
  • Probe SRS Series 2618-t61 Forged Pistons-1.165 C/H
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 H-Beam Steel Rods
  • ARP 8740 Cap Screws
  • External Balance (28 oz)
  • Components rated at 700 Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vigilante Engine Kit
Vigilante Engine Kit_Ford 331_5.400 Rod_Flat_-7.0cc_External_Twisted Wedge 11R Head

P/N: 9100-71007
  • Valve Pockets for Twisted Wedge 11R Heads
  • Probe SRS Series 2618-t61 Forged Pistons-1.165 C/H
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 H-Beam Steel Rods
  • ARP 8740 Cap Screws
  • External Balance (28 oz)
  • Components rated at 700 Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vigilante Engine Kit
Vigilante Engine Kit_Ford 331_5.400 Rod_Flat_-7.0cc_External_STD Wedge Head

P/N: 9100-11007
  • Valve Pockets for Standard Wedge Heads
  • Probe SRS Series 2618-t61 Forged Pistons-1.165 C/H
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 H-Beam Steel Rods
  • ARP 8740 Cap Screws
  • External Balance (28 oz)
  • Components rated at 700 Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vigilante Engine Kit
Vigilante Engine Kit_Ford 331_5.400 Rod_Flat_-4.0cc_Internal_Twisted Wedge Head

P/N: 9100-61011          Internal Balance
  • Valve Pockets for Twisted Wedge Heads
  • Probe SRS Series 2618-t61 Forged Pistons-1.165 C/H
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 H-Beam Steel Rods
  • ARP 8740 Cap Screws
  • Internal Balance
  • Components rated at 700 Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vigilante Engine Kit
Vigilante Engine Kit_Ford 331_5.400 Rod_Flat_-4.0cc_Internal_Twisted Wedge 11R Head

P/N: 9100-71011          Internal Balance
  • Valve Pockets for Twisted Wedge 11R Heads
  • Probe SRS Series 2618-t61 Forged Pistons-1.165 C/H
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 H-Beam Steel Rods
  • ARP 8740 Cap Screws
  • Internal Balance
  • Components rated at 700 Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vigilante Engine Kit
Vigilante Engine Kit_Ford 331_5.400 Rod_Flat_-4.0cc_Internal_STD Wedge Head

P/N: 9100-11011          Internal Balance
  • Valve Pockets for Standard Wedge Heads
  • Probe SRS Series 2618-t61 Forged Pistons-1.165 C/H
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 H-Beam Steel Rods
  • ARP 8740 Cap Screws
  • Internal Balance
  • Components rated at 700 Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vindicator Engine Kit
Vindicator Engine Kit_Ford 331_Flat_-4.0cc_External_STD Wedge Head

P/N: 9200-11016
  • All Standard Wedge Cylinder Heads
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 Lightweight I-Beam Rods
  • ARP-2000 Cap Screws
  • Probe PRS Series 2618-t61 Forged Pistons-1.165 C/H
  • 52100 Bearing Steel Wrist Pins
  • .043 .043 3.0 Piston Rings
  • Top or Lateral Gas Ports
  • AP Steel Top - Napier Second Ring Set
  • External Balance (28 oz)
  • Components rated at 850+ Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vindicator Engine Kit
Vindicator Engine Kit_Ford 331_Flat_-4.0cc_External_Twisted Wedge Head

P/N: 9200-61016
  • Twisted Wedge Cylinder Heads
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 Lightweight I-Beam Rods
  • ARP-2000 Cap Screws
  • Probe PRS Series 2618-t61 Forged Pistons-1.165 C/H
  • 52100 Bearing Steel Wrist Pins
  • .043 .043 3.0 Piston Rings
  • Top or Lateral Gas Ports
  • AP Steel Top - Napier Second Ring Set
  • External Balance (28 oz)
  • Components rated at 850+ Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info
Probe Vindicator Engine Kit
Vindicator Engine Kit_Ford 331_5.400 Rod_Flat_-4.0cc_External_Twisted Wedge 11R Head

P/N: 9200-71016
  • Twisted Wedge 11R Cylinder Heads
  • Probe 3.250 Stroke 4340 Forged Steel Crankshaft
  • Probe 5.400 ctc 4340 Lightweight I-Beam Rods
  • ARP-2000 Cap Screws
  • Probe PRS Series 2618-t61 Forged Pistons-1.165 C/H
  • 52100 Bearing Steel Wrist Pins
  • .043 .043 3.0 Piston Rings
  • Top or Lateral Gas Ports
  • AP Steel Top - Napier Second Ring Set
  • External Balance (28 oz)
  • Components rated at 850+ Horsepower
Available Bore Sizes: 4.000, 4.030, 4.040 more info