4856-3720 4.6 Ford Modular FX Series -21cc Dish Top Modular 4V Forged Piston Set 3.720 inch bore COMP HEIGHT: 1.21"

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PART #: 1-4856-3720

4856-3720 4.6 Ford Modular FX Series -21cc Dish Top Modular 4V Forged Piston Set 3.720 inch bore Pin Dia.: 0.866" Comp Height: 1.21"

Name: 4856-3720 4.6 Ford Modular FX Series -21cc Dish Top Modular 4V Forged Piston Set 3.720 inch bore Pin Dia.: 0.866" Comp Height: 1.21"
Brand: DSS RACING
SKU: 1-4856-3720
Price: 669.95 USD
Availability: InStock

$669.95

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308 Ford Modular, FX, Comp Height: 1.21, -21cc Dish Top, PIN: .866", Full-Floating or Press Fit, Ring Groove: 1.5/1.5/3MM, Stroke: 3.543", ROD: 5.933, Approx Comp Ratio: 44cc-9.75, 50cc-9.07, 53cc-8.78

Piston Specs
Piston Series Comparison Chart

Piston Top Aprox. Comp. Ratio:

-21cc Dish Top Modular 4V
Chamber	Comp Ratio
44	9.75 to 1
50	9.07 to 1
53	8.78 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: Ford

Engine Family: Ford Modular

Engine Size: 4.6

Cylinder Bore Size: 3.720 in , 94.414 mm

Ring Groove Width: 1.5/1.5/3MM

Compression Height: 1.210"

Pin Diameter: 0.866"

Connecting Rod Length: 5.933"

Crankshaft Stroke: 3.543"

Cylinder Head: Modular 4V

TDC Assembly Height: 8.915" ( 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