6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"
Load image into Gallery viewer, 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"
Load image into Gallery viewer, 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"
Load image into Gallery viewer, 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"
Load image into Gallery viewer, 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"
Load image into Gallery viewer, 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"
Load image into Gallery viewer, 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"
Load image into Gallery viewer, 6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore COMP HEIGHT: 1.625"

PART #: 1-6020-4165D

6020-4165 425 Big Block Oldsmobile FX Series -12cc Flat Top Oldsmobile Forged Piston Set 4.165 inch bore Pin Dia.: 0.98" Comp Height: 1.625"

$669.95
$669.95
Sale Sold out
/
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!

Secure Payment

Secure Payment

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

433 Big Block Oldsmobile, FX, Comp Height: 1.625, -12cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1/16-1/16-3/16" , Stroke: 3.975", ROD: 7, Approx Comp Ratio: 72cc-10.55, 75cc-10.25, 77cc-10.05


Piston Top Aprox. Comp. Ratio:

-12cc Flat Top Oldsmobile
ChamberComp Ratio
7210.55 to 1
7510.25 to 1
7710.05 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Oldsmobile

Engine Family: Big Block Oldsmobile

Engine Size: 425

Cylinder Bore Size: 4.165 in , 105.708 mm

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

Compression Height: 1.625"

Pin Diameter: 0.980"

Connecting Rod Length: 7.000"

Crankshaft Stroke: 3.975"

Cylinder Head: Oldsmobile

TDC Assembly Height: 10.613" ( 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 Flat Top Oldsmobile
ChamberComp Ratio
7210.55 to 1
7510.25 to 1
7710.05 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Oldsmobile

Engine Family: Big Block Oldsmobile

Engine Size: 425

Cylinder Bore Size: 4.165 in , 105.708 mm

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

Compression Height: 1.625"

Pin Diameter: 0.980"

Connecting Rod Length: 7.000"

Crankshaft Stroke: 3.975"

Cylinder Head: Oldsmobile

TDC Assembly Height: 10.613" ( 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