Keith Black Pistons KB370-040 Fits Pontiac 389 Flat Top 3.5cc Bore 4.1026

Fits Pontiac 389, Bore 4.1026 Stroke 3.750, Rod Length 6.630, Flat Top 3.5cc, 2 Valve Reliefs, Compression Height 1.720, Set of 8 Pistons

$561.95

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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 71cc 10.7:1, 87cc 9.2:1, 96cc 8.5:1, 111cc 7.6:1

Advertised piston weight 609 grams, 163 gram wrist pin

OE Deck Height 10.250"

Note: Standard bore size is 4.0626

Note: Centered Pin. Designed for 20° heads, 1966 and earlier. This piston will not work with 14° heads. Check the small end of the rod to piston before assembly. 0.045" clearance per side minimum

Specifications

More Information
Price	$561.95
Vehicle Make	Pontiac
Bore Size	4.1026
Crankshaft Stroke	3.750
Rod Length	6.630
Piston Type	Flat Top
Compression Height	1.720
Piston Material	Hypereutectic
Piston Ring Size	5/64 5/64 3/16
Wrist Pin Size	0.981
Custom Notices	⚠ PROP 65 WARNING