October 2010 Chevy High Performance Engine Guide - Swing Away

CHP's Guide To Big-Inch Crate Engines

Sean Haggai Aug 31, 2010 0 Comment(s)
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Race technology for the street is here with Speed-O-Motive's 625hp 440ci small-block. The base of the foundation is a CNC machined Dart block with splayed four-bolt main caps. Making up the bottom end is a forged 4340 crank, 6.00-inch Eagle Specialties H-beam rods, and forged 10:1-compression pistons with Napier rings. Heavy breathing duties come in the form of fully ported aluminum 230cc cylinder heads. These feature CNC bowl blending and come with 2.08/1.60-inch intake/exhaust valves with 1.6 roller rockers. Also included are ARP head bolts, Fel-Pro gaskets, and Manley pushrods. All engines come balanced, blueprinted, and dyno tuned with a 2-year warranty. Speed-O-Motive also provides free shipping and should you need a bit more grunt, then there's also an optional 675hp race gas version.

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Where To Get It

Shafiroff begins with a Merlin III street block with four-bolt main caps and drops in a complete forged rotating assembly that includes a 4.250-inch stroke crank and 6.385-inch I-beam rods with Clevite H series bearings. Shafiroff installs a Comp valvetrain with a custom grind hydraulic-roller, high-performance hydraulic lifters with vertical bars, and 1.7:1 Ultra Pro Magnum rockers. Heads are SSRE spec Patriot 320cc aluminum cylinder heads with 2.30/1.88-inch intake/exhaust valves and 1.530-inch valvesprings that are locked in with 10 degree steel retainers. The oiling system is taken care of with Melling race pump and Milodon street/strip pan. Rounding out the package, Shafiroff incorporates an Edelbrock dual-plane manifold and an 8-inch balancer. An aluminum block and a fuel injected version are also available.

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Where To Get It

Smeding Performance
Offering up their smallest Rat motor, Smeding's 540ci monster comes with a fully CNC machined four-bolt main block that sports 4.500-inch bores on a standard 9.8-inch deck. Internals include a complete forged rotating assembly with a micropolished crankshaft, H-beam rods, and lightweight forged pistons with an 8cc dome to create a pump gas friendly 10:1 compression. At the heart of the mill, Smedding includes a custom-ground cam with 0.544/0.573-inch lift and 238/248 degrees of duration at 0.050. AFR 305cc lungs provide plenty of volume which are paired to 1.7:1 roller rockers. You also get your choice of Quick Fuel Technology or Demon 850-cfm carburetor, along with either an electronic HEI or MSD ignition. Plus, it all comes with a 3-year/Unlimited-mileage warranty.

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Where To Get It
Smeding Performance


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