6112-4125 421 Pontiac Early and Late FX Series -7cc Flat Top Pontiac Early and Late Forged Piston Set 4.125 inch bore COMP HEIGHT: 1.585"

Load image into Gallery viewer, 6112-4125 421 Pontiac Early and Late FX Series -7cc Flat Top Pontiac Early and Late Forged Piston Set 4.125 inch bore COMP HEIGHT: 1.585"

PART #: 1-6112-4125

6112-4125 421 Pontiac Early and Late FX Series -7cc Flat Top Pontiac Early and Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.98" Comp Height: 1.585"

Name: 6112-4125 421 Pontiac Early and Late FX Series -7cc Flat Top Pontiac Early and Late Forged Piston Set 4.125 inch bore Pin Dia.: 0.98" Comp Height: 1.585"
Brand: DSS RACING
SKU: 1-6112-4125
Price: 669.95 USD
Availability: InStock

$669.95

Sale Sold out

FX-1 4032 Alloy Sold out

FX-2 2618 Alloy Sold out

FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs Sold out

Pistons - Pins and Locs Without Rings Sold out

Pistons - Pins - Locs With DSS Racing Rings in a Kit Sold out

Ships in 1 - 8 days

Forged Pistons Made in the USA!

Secure Payment

Quantity must be 1 or more

428 Pontiac Early and Late, FX, Comp Height: 1.585, -7cc Flat Top , PIN: .98", Full-Floating or Press Fit, Ring Groove: 1/16-1/16-3/16" , Stroke: 4.000", ROD: 6.625, Approx Comp Ratio: 62cc-12.29, 87cc-9.53, 124cc-7.27

Piston Specs
Piston Series Comparison Chart

Piston Top Aprox. Comp. Ratio:

-7cc Flat Top Pontiac Early and Late
Chamber	Comp Ratio
62	12.29 to 1
87	9.53 to 1
124	7.27 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Pontiac

Engine Family: Pontiac Early and Late

Engine Size: 421

Cylinder Bore Size: 4.125 in , 104.693 mm

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

Compression Height: 1.585"

Pin Diameter: 0.980"

Connecting Rod Length: 6.625"

Crankshaft Stroke: 4.000"

Cylinder Head: Pontiac Early and Late

TDC Assembly Height: 10.210" ( Zero Deck Height )

Download Piston Instructions

Features:	Piston Series
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