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Howards Pro Max™ 2618 Forged Race Pistons
The Pro Max™ forging design produces a stronger piston than most standard pistons for the ultimate in performance. All Howards HRC Racing Pistons are forged from 2618 billet bar stock and then heat treated and aged to a T61 condition (2618-T61). This material has less than 1% silicon particulate content. This superior alloy is designed to stand up to the most extreme stress placed on many racing pistons. Another advantage of 2618-T61 over the high silicon pistons is the ability to keep its shape under extreme pressure and high RPM's. "Skirt Shrinking" is not a problem with Howards HRC Racing Pistons. All HRC pistons are machined on the most modern CNC equipment in the industry. The design of the CNC turned skirts allows these pistons to work properly under intense heat and severe side loads without scuffing or splitting the cylinder walls. The valve pockets are designed to handle large cam profiles and oversized valves. Forced pin oilers, accumulator grooves and lock removal indents are standard. Sets include lightweight .150" wall, heat treated aircraft quality wrist pins. Double spirolox are standard.
• Forged from 2618-T61 Billet Aluminum Bar Stock
• Oversized Valve Pockets
• Accumulator Grooves for Improved Ring Seal
• Machined Oil Drain Back Holes
• Lightweight Aircraft Quality Wrist Pins Included
• Lock Removal Indents
• CNC Turned Skirts
• Radius Valve Reliefs
• 1.5, 1.5, 3mm Ring Grooves
• Forced Pin Oilers
• Honed Pin Bores
• Double Spirolox
Part Type: Pistons
Model: ProMax 2618 Forged Race Pistons
Application: Chevrolet Small Block V8
Piston Style: 23 Degree Flat Top
Cylinder Bore: 4.030"
Compression Distance: 1.125"
Crankshaft Stroke/Rod Length: 3.480" with 6.125" Connecting Rod (355ci)
Crankshaft Stroke/Rod Length: 3.500" with 6.125" Connecting Rod (357ci)
Crankshaft Stroke/Rod Length: 3.750" with 6.000" Connecting Rod (383ci)
Deck Height (Zero Deck): 9.000" (3.480" Stroke is 8.990")
Dome Volume: -5cc
Compression Ratio: 3.480" Stroke w/58cc Heads: 11.1
Compression Ratio: 3.480" Stroke w/64cc Heads: 10.3
Compression Ratio: 3.480" Stroke w/76cc Heads: 9.0
Compression Ratio: 3.500" Stroke w/58cc Heads: 11.1
Compression Ratio: 3.500" Stroke w/64cc Heads: 10.4
Compression Ratio: 3.500" Stroke w/76cc Heads: 9.1
Compression Ratio: 3.750" Stroke w/58cc Heads: 11.9
Compression Ratio: 3.750" Stroke w/64cc Heads: 11.1
Compression Ratio: 3.750" Stroke w/76cc Heads: 9.7
Piston Material: Forged 2618-T6 Aluminum
Intake Valve Relief Depth: .320"
Intake Valve Relief Diameter: 2.200"
Exhaust Valve Relief Depth: .280"
Exhaust Valve Relief Diameter: 1.800"
Accumulator Groves: Yes
Forced Pin Oilers: Yes
Gas Ports: No
Skirt Coating: CNC Turned Skirts
Lock Removal Indents: Yes
Average Piston Weight: 405g
Wrist Pin Style: Press-Fit or Floating
Wrist Pins Included: .150" Heat Treated Air Craft Quality Steel
Wrist Pin Size: .927 x 2.300"
Average Wrist Pin Weight: 108g
Pin Lock Included: Double Spirolox
Ring Grove Sizes: 1.5mm, 1.5mm, 3mm
Piston Rings Included: No
Manufacturer: Howards Cams & Racing Components
Manufacturer's Part Number: 840312205
Weight: 12.0 lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Sets of 8
Note: Oil Rail Support Included.
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