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FPS Forged Pistons for
Chevrolet 350 - 383

  • VMS75 high silicon forged aluminum

  • Increased valve clearance

  • Lightweight

  • Tight running clearance (.002 to .006)

  • Weight matched (+/- 2.5 grams)

  • Finished diameters +/- .00005

  • Shallow Valve Reliefs to maximize compression

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 PROBE FORGED PISTONS
Compression Ratio computed with .010 deck and .038 head gasket at bore +.125" (weights and compression ratios are approximate)
    Compression Ratio      
Bore Weight 58cc 64cc 68cc 76cc Part # Ring Set  

ULTRALIGHT  350 - 3.480 Stroke - 5.700 Rod- 1.563 C/H - .927 x 2.500 - 118 Gram Full Floating Pin
4.030 490 11.24 10.44 9.98 9.17 L2556F-030 315-0036-030 Ring Grooves 1/16 1/16 3/16
4.040 500 11.28 10.48 10.02 9.21 L2556F-040 315-0036--040 Valve Relief Volume 2.5cc
4.060 510 11.37 10.56 10.09 9.28 L2556F-060 315-0036-060  

L2256F is a lightweight circle track design with .927 x 2.500 wrist pin with double spiral locks and 1/16 1/16 3/16 Race Rings

350 - 3.480 Stroke - 5.700 Rod- 1.563 C/H - .927 x 3.000 Press Fit Pin

4.000

516

10.90

10.14

9.70

8.93

P2556F-Std

 40564CP Ring Grooves 5/64 5/64 3/16
4.030 536 11.03 10.26 9.81 9.03 P2556F-030 40564CP-030 Valve Relief Volume 4.0cc
4.040 541 11.07 10.30 9.85 9.07 P2556F-040 40564CP-040  
4.060 545 11.16 10.38 9.93 9.14 P2556F-060 40564CP-060  

383 - 3.750 Stroke - 5.700 Rod- 1.425 C/H - .927 x 3.000 Press Fit Pin

4.000

514

11.67

10.85

10.37

9.54

P3831F-Std

 40564CP Ring Grooves 5/64 5/64 3/16
4.030 528 11.81 10.98 10.50 9.66 P3831F-030 40564CP-030 Valve Relief Volume 4.0cc
4.040 534 11.85 10.02 10.54 9.70 P3831F-040 40564CP-040  
4.060 541 11.94 10.11 10.62 9.77 P3831F-060 40564CP-060  
Back To:
 PROBE FORGED PISTONS

 

Dish Top

FPS Forged Pistons
for Chevrolet

350 through 383

  • VMS75 high silicon forged aluminum

  • Increased valve clearance

  • Lightweight

  • Tight running clearance (.002 to .006)

  • Weight matched (+/- 2.5 grams)

  • Finished diameters +/- .00005

Back To:
 PROBE FORGED PISTONS
Compression Ratio computed with .010 deck and .038 head gasket at bore +.125" (weights and compression ratios are approximate)
    Compression Ratio      
Bore Weight 58cc 64cc 68cc 76cc Part # Ring Set  

350 - 3.480 Stroke - 5.700 Rod- 1.562 C/H - .927 x 3.000 Press Fit Pin

4.030

493

9.86

9.25

8.89

8.25

P2403F-Std

 40564CP Ring Grooves 5/64 5/64 3/16
4.030 514 9.98 9.36 8.99 8.35 P2403F-030   Dish Volume 12.5cc
4.040 518 10.02 9.39 9.03 8.38 P2403F-040    
4.060 524 10.09 9.47 9.10 8.44 P2403F-060    

350 - 3.480 Stroke - 5.700 Rod- 1.560 C/H - .927 x 3.000 Press Fit Pin

4.030

486

9.08

8.57

8.26

7.72

P2441F-Std

 40564CP Ring Grooves 5/64 5/64 3/16
4.030 498 9.19 8.67 8.39 7.81 P2441F-030   Dish Volume 20.3cc
4.040 504 9.22 8.70 8.39 7.84 P2441F-040    
4.060 513 9.30 8.77 8.46 7.90 P2441F-060    

383 - 3.750 Stroke - 5.700 Rod- 1.425 C/H - .927 x 3.000 Press Fit Pin

4.030

460

9.54

9.01

8.69

8.13

P3832F-Std

 40564CP Ring Grooves 5/64 5/64 3/16
4.030 477 9.66 9.12 8.80 8.22 P3832F-030   Dish Volume 22.0cc
4.040 490 9.70 9.16 8.83 8.25 P3832F-040    
4.060 523 9.77 9.23 8.90 8.32 P3832F-060