6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"
Load image into Gallery viewer, 6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"
Load image into Gallery viewer, 6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"
Load image into Gallery viewer, 6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"
Load image into Gallery viewer, 6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"
Load image into Gallery viewer, 6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"
Load image into Gallery viewer, 6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"
Load image into Gallery viewer, 6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore COMP HEIGHT: 1.09"

PART #: 1-6703-3917

6703-3917 5.7 Stroker Small Block Mopar Hemi Gen III FX Series -12cc Dish Top Gen III Hemi Forged Piston Set 3.917 inch bore Pin Dia.: 0.927" Comp Height: 1.09"

$669.95
$669.95
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Piston Series Option:
Piston Ring Kit Option:
Ships in 1 - 8 days

Ships in 1 - 8 days

Forged Pistons Made in the USA!

Forged Pistons Made in the USA!

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This is a pre order item. We will ship it when it comes in stock.

390 Small Block Mopar Hemi Gen III, FX, Comp Height: 1.09, -12cc Dish Top, PIN: .927", Full-Floating or Press Fit, Ring Groove: 1.2/1.2/3MM, Stroke: 4.050", ROD: 6.125, Approx Comp Ratio: 65cc-10.41, 74cc-9.51, 85cc-8.62


Piston Top Aprox. Comp. Ratio:

-12cc Dish Top Gen III Hemi
ChamberComp Ratio
6510.41 to 1
749.51 to 1
858.62 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Mopar

Engine Family: Small Block Mopar Hemi Gen III

Engine Size: 5.7 Stroker

Cylinder Bore Size: 3.917 in , 99.413 mm

Ring Groove Width: 1.2/1.2/3MM

Compression Height: 1.090"

Pin Diameter: 0.927"

Connecting Rod Length: 6.125"

Crankshaft Stroke: 4.050"

Cylinder Head: Gen III Hemi

TDC Assembly Height: 9.240" ( Zero Deck Height )

Download Piston Instructions

 
Features: Piston Series
 

E series

  SX series  1-FX series  2-FX series  3-FX series
Broached pin oiling slots

x

x

 

 

 
Drilled, forced wrist pin oiling

 

x

x

x

x
Forged drain-back windows

x

 

 

 

 
Drilled bottom ring land intersecting oil groove drain-backs

 

x

x

x

x
Slightly larger, deeper valve reliefs than OEM

x

 

 

 

 
CNC machined valve reliefs for moderate performance heads and cam combinations

 

x
Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations

 

 

x

x

x
Premium Aircraft spec. 4032 low expansion alloy

x

x

x

 

 
Premium Aircraft spec. 2618 alloy

 

 

 

x

x
Blower, Turbo, NOS ready

 

x

x

x

x
Brushed piston crown

 

 

x

x

x
Turned dishs

x

x

 

 

 
Max Quench milled dishs

 

 

x

x

x
Additional CNC milling for weight reduction in non-critical areas

 

 

x

x

x
Patented “X Groove” skirt for superior cylinder and ring life

 

 

x

x

x
Thinner/shallower Ring grooves for maximum ring seal and land strength

 

 

x

x

x
Low volume contact reduction grooves    

x

x

x
2nd ring land accumulator groove prevents ring flutter    

x

x

x
3rd ring land scraper relief    

x

x

x
Oil ring groove relief reservoir    

x

x

x
Inner and outer pin boss weight reduction radiusing    

x

x

x
Tighter control of crown thickness yields consistently lighter parts    

x

x

x
Dynamic skirt milling controls skirt thickness for consistently lighter parts  

 

x

x

x
Diamond-turned high strength skirts

x

x

x

x

x
High-strength piston pins

x

x

x

x

x
Extreme Duty XR wrist pins      

 

x
Horizontal Gas Ports enhance ring seal        

x
Forged and machined in the USA

x

x

x

x

x
Piston Specs

Piston Top Aprox. Comp. Ratio:

-12cc Dish Top Gen III Hemi
ChamberComp Ratio
6510.41 to 1
749.51 to 1
858.62 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Mopar

Engine Family: Small Block Mopar Hemi Gen III

Engine Size: 5.7 Stroker

Cylinder Bore Size: 3.917 in , 99.413 mm

Ring Groove Width: 1.2/1.2/3MM

Compression Height: 1.090"

Pin Diameter: 0.927"

Connecting Rod Length: 6.125"

Crankshaft Stroke: 4.050"

Cylinder Head: Gen III Hemi

TDC Assembly Height: 9.240" ( Zero Deck Height )

Download Piston Instructions

Piston Series Comparison Chart
 
Features: Piston Series
 

E series

  SX series  1-FX series  2-FX series  3-FX series
Broached pin oiling slots

x

x

 

 

 
Drilled, forced wrist pin oiling

 

x

x

x

x
Forged drain-back windows

x

 

 

 

 
Drilled bottom ring land intersecting oil groove drain-backs

 

x

x

x

x
Slightly larger, deeper valve reliefs than OEM

x

 

 

 

 
CNC machined valve reliefs for moderate performance heads and cam combinations

 

x
Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations

 

 

x

x

x
Premium Aircraft spec. 4032 low expansion alloy

x

x

x

 

 
Premium Aircraft spec. 2618 alloy

 

 

 

x

x
Blower, Turbo, NOS ready

 

x

x

x

x
Brushed piston crown

 

 

x

x

x
Turned dishs

x

x

 

 

 
Max Quench milled dishs

 

 

x

x

x
Additional CNC milling for weight reduction in non-critical areas

 

 

x

x

x
Patented “X Groove” skirt for superior cylinder and ring life

 

 

x

x

x
Thinner/shallower Ring grooves for maximum ring seal and land strength

 

 

x

x

x
Low volume contact reduction grooves    

x

x

x
2nd ring land accumulator groove prevents ring flutter    

x

x

x
3rd ring land scraper relief    

x

x

x
Oil ring groove relief reservoir    

x

x

x
Inner and outer pin boss weight reduction radiusing    

x

x

x
Tighter control of crown thickness yields consistently lighter parts    

x

x

x
Dynamic skirt milling controls skirt thickness for consistently lighter parts  

 

x

x

x
Diamond-turned high strength skirts

x

x

x

x

x
High-strength piston pins

x

x

x

x

x
Extreme Duty XR wrist pins      

 

x
Horizontal Gas Ports enhance ring seal        

x
Forged and machined in the USA

x

x

x

x

x
Engine Power TV

The DSS FX, X-Groove Feature