Keith Black Pistons KB403-030 Fits BBF 521 Dish 30cc Bore 4.390

Fits BB Ford 521, Bore 4.390 Stroke 4.300, Rod Length 6.700, Dish 30cc, 1 Valve Relief, Compression Height 1.450, Set of 8 Pistons

$488.32

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⚠ PROP 65 WARNING

⚠ WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer. Please contact us to obtain a list of harmful chemicals. For more information, go to www.P65Warnings.ca.gov.

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Description

Keith Black Hypereutectic pistons are a great choice for high performance marine, drag race, circle track, street or towing application builds. The low expansion 390 alloy with 16 percent silicon allows for a tighter piston to wall running clearance.

Fully machined head and valve reliefs

Triple Spiral Lock Rings

CNC machined pin bores produce straight and accurately sized bores

Accumulator Groove aids with compression ring seal

Machined in Oil Returns

Diamond Finished Skirts

Mini Grooves to reduce scuffing and overheating

Wrist pins and spiral lock included

5/64 x 5/64 x 3/16 rings not included

Compression Ratio 76cc 10.7:1, 82cc 10.2:1, 91cc 9.5:1, 97cc 9.1:1

Advertised piston weight 659 grams, 158 gram wrist pin

OE Deck Height 10.320"

Note: Standard bore size is 4.360

Note: Centered Pin. Made from Ford 460 block. Check rod side clearance

Specifications

More Information
CNC Part Number	UEM-KB403-030
Price	$488.32
Sold As	Set
Manufacturer's Part Number	KB403-030
Brands	Keith Black
Part Types	Engine Piston
Departments	Parts
Vehicle Make	Ford BB
Bore Size	4.390
Crankshaft Stroke	4.300
Rod Length	6.700
Piston Type	Dish
Compression Height	1.450
Piston Material	Hypereutectic
Piston Ring Size	1/16 1/16 3/16
Wrist Pin Size	0.989
Custom Notices	⚠ PROP 65 WARNING