6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"
Load image into Gallery viewer, 6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"
Load image into Gallery viewer, 6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"
Load image into Gallery viewer, 6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"
Load image into Gallery viewer, 6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"
Load image into Gallery viewer, 6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"
Load image into Gallery viewer, 6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"
Load image into Gallery viewer, 6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore COMP HEIGHT: 1.802"

PART #: 1-6300-4040

6300-4040 340 Small Block Mopar FX Series -3cc Flat Top Small Block Mopar Forged Piston Set 4.040 inch bore Pin Dia.: 0.984" Comp Height: 1.802"

$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.

339 Small Block Mopar, FX, Comp Height: 1.802, -3cc Flat Top , PIN: .984", Full-Floating or Press Fit, Ring Groove: 1/16-1/16-3/16" , Stroke: 3.310", ROD: 6.123, Approx Comp Ratio: 62cc-10.46, 64cc-10.21, 72cc-9.33


Piston Top Aprox. Comp. Ratio:

-3cc Flat Top Small Block Mopar
ChamberComp Ratio
6210.46 to 1
6410.21 to 1
729.33 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Mopar

Engine Family: Small Block Mopar

Engine Size: 340

Cylinder Bore Size: 4.040 in , 102.535 mm

Ring Groove Width: 1/16-1/16-3/16"

Compression Height: 1.802"

Pin Diameter: 0.984"

Connecting Rod Length: 6.123"

Crankshaft Stroke: 3.310"

Cylinder Head: Small Block Mopar

TDC Assembly Height: 9.580" ( 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:

-3cc Flat Top Small Block Mopar
ChamberComp Ratio
6210.46 to 1
6410.21 to 1
729.33 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Mopar

Engine Family: Small Block Mopar

Engine Size: 340

Cylinder Bore Size: 4.040 in , 102.535 mm

Ring Groove Width: 1/16-1/16-3/16"

Compression Height: 1.802"

Pin Diameter: 0.984"

Connecting Rod Length: 6.123"

Crankshaft Stroke: 3.310"

Cylinder Head: Small Block Mopar

TDC Assembly Height: 9.580" ( 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