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You are here: Home > Pistons > Probe Forged Pistons > SRS - Sportsman Race Series > Chevrolet > Chevrolet - 400 Small Block > Flat Top



Flat top pistons in a Chevrolet 400 to 434 engine will generally provide compression ratios in the 12.5 to 12.5:1 range which makes them a good option for competition engines with aluminum heads and larger than stock camshafts. Valve reliefs are configured to work with most types of standard and 23° aluminum cylinder heads and will normally fit camshafts to well over .600 valve lift.

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Probe Forged Pistons
Probe Forged Pistons_SRS Series_Chevrolet 377_Flat_1.260 C/H_4.125 Base Bore_-5.0cc_.927 Pin_23° Wedge Head_W/Ring Set

P/N: 8122-1-13954
  • V/R for 23d Wedge Head
  • 1.260 Compression Height
  • 3.480 Stroke
  • 6.000 Rod Length
  • .927 Wrist Pin
  • 1.5 1.5 3.0 Ring Grooves (rings included)
  • Nitrous - 250 H/P
  • Forced Induction - 12 lbs
Available Bore Sizes: 4.125, 4.145, 4.155, 4.165, 4.185
Price includes pistons, pins, locks and oil rail spacers (as required) more info
Probe Forged Pistons
Probe Forged Pistons_SRS Series_Chevrolet 377_Flat_1.560 C/H_4.125 Base Bore_-5.0cc_.927 Pin_23° Wedge Head_W/Ring Set

P/N: 8122-1-13955
  • V/R for 23d Wedge Head
  • 1.560 Compression Height
  • 3.480 Stroke
  • 5.700 Rod Length
  • .927 Wrist Pin
  • 1.5 1.5 3.0 Ring Grooves (rings included)
  • Nitrous - 250 H/P
  • Forced Induction - 12 lbs
Available Bore Sizes: 4.125, 4.145, 4.155, 4.165, 4.185
Price includes pistons, pins, locks and oil rail spacers (as required) more info
Probe Forged Pistons
Probe Forged Pistons_SRS Series_Chevrolet 400_Flat_1.125 C/H_4.125 Base Bore_-5.0cc_.927 Pin_23° Wedge Head_W/Ring Set

P/N: 8122-1-12339
  • V/R for 23d Wedge Head
  • 1.125 Compression Height
  • 3.750 Stroke
  • 6.000 Rod Length
  • .927 Wrist Pin
  • 1.5 1.5 3.0 Ring Grooves (rings included)
  • Nitrous - 250 H/P
  • Forced Induction - 12 lbs
Available Bore Sizes: 4.125, 4.145, 4.155, 4.165, 4.185
Price includes pistons, pins, locks and oil rail spacers (as required) more info
Probe Forged Pistons
Probe Forged Pistons_SRS Series_Chevrolet 400_Flat_1.425 C/H_4.125 Base Bore_-5.0cc_.927 Pin_23° Wedge Head_W/Ring Set

P/N: 8122-1-12338
  • V/R for 23d Wedge Head
  • 1.425 Compression Height
  • 3.750 Stroke
  • 5.700 Rod Length
  • .927 Wrist Pin
  • 1.5 1.5 3.0 Ring Grooves (rings included)
  • Nitrous - 250 H/P
  • Forced Induction - 12 lbs
Available Bore Sizes: 4.125, 4.145, 4.155, 4.165, 4.185
Price includes pistons, pins, locks and oil rail spacers (as required) more info
Probe Forged Pistons
Probe Forged Pistons_SRS Series_Chevrolet 421_Flat_1.062 C/H_4.125 Base Bore_-5.0cc_.927 Pin_23° Wedge Head_W/Ring Set

P/N: 8122-1-14775
  • V/R for 23d Wedge Head
  • 1.062 Compression Height
  • 3.875 Stroke
  • 6.000 Rod Length
  • .927 Wrist Pin
  • 1.5 1.5 3.0 Ring Grooves (rings included)
  • Nitrous - 250 H/P
  • Forced Induction - 12 lbs
Available Bore Sizes: 4.125, 4.145, 4.155, 4.165, 4.185
Price includes pistons, pins, locks and oil rail spacers (as required) more info
Probe Forged Pistons
Probe Forged Pistons_SRS Series_Chevrolet 434_Flat_1.000 C/H_4.125 Base Bore_-5.0cc_.927 Pin_23° Wedge Head_W/Ring Set

P/N: 8122-1-14680
  • V/R for 23d Wedge Head
  • 1.000 Compression Height
  • 4.000 Stroke
  • 6.000 Rod Length
  • .927 Wrist Pin
  • 1.5 1.5 3.0 Ring Grooves (rings included)
  • Nitrous - 250 H/P
  • Forced Induction - 12 lbs
Available Bore Sizes: 4.125, 4.145, 4.155, 4.165, 4.185
Price includes pistons, pins, locks and oil rail spacers (as required) more info