SEMA 2012: Eagle Shows Off Stroker Cranks and New Rods

Among the many new products on display in the Eagle Specialty booth at SEMA was a complete competition stroker kit for the Ford 351 Cleveland engine.

“Takes all the guesswork out,” says Eagle’s Alan Davis.

With a .030-over piston and 4.00-inch stoke, the displacement increases to 408 ci. The kit includes:

• Mahle forged pistons with a 1.2-inch compression height, graphite-impregnated skirt coating and phosphate piston coating
• 4340 steel crankshaft (also available in standard 3.850-inch stroke) with .125 radii, 2.100-inch rod journals and nitrided and polished journals.
• 6.0-inch forged 4340 H-beam connecting rods with 7/16 ARP 8740 bolts with ARP 2000 or L19 bolts available
• Clevite77 bearings

When matched with an 84cc combustion chamber, compression will be around 9.77:1 using this kit. An 80cc chamber bumps the compression up to 10.15:1.

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In the keeping with the 351C theme, Eagle also has a new 4340 Chromoly steel crank with a 4.00-inch stroke, 2.100-inch rod journals and 2.750-inch main journals. Weight is around 59 pounds, and Eagle says a 6-inch minimum rod length is required.

New stroker cranks are also available for the Ford 4.6-liter V8 and the Pontiac 400. The former is a 3.750-inch stroke and is a non-twist 4340 forging. Construction highlights include multi-stage heat process, stress relieving, shot-peening and nitriding. Approximate weight is 50 pounds, and Eagle says the crank is good for up to 1,500 horsepower.

The Pontiac crank is also a 4340 Chromoly steel forging with a 4.500-inch stroke, 2.200-inch rod journals and 3.00-inch main journals. Minimum rod length is 6.8 inches, and weight is about 78 pounds.

Eagle also showed off a 5.950-inch version of its H-beam connecting rod. This piece is forged from 4340 steel, has a 2.100-inch journal, .927-inch pin and comes with 7/16-inch ARP 8740 bolts. Sets are matched to +/- 1 gram.