For die-hard LS engine fans, new innovations in small-block Chevy engineering might not be groundbreaking, but for the loyal followers of the venerable small-block Chevy, the excitement is real. Small-blocks from Chevrolet have long been the engine of choice for performance builds, yet finding suitable cores is becoming increasingly difficult. The demand for reliable, affordable blocks is soaring, while high-quality original small-blocks are slowly disappearing.
The Challenge of Finding Small-Block Chevy Cores
Anyone looking for an affordable, standard-bore, 2-bolt 400 block today will face tough competition. Even if you manage to track one down, it will come with a hefty price tag. This shortage of viable cores is a major concern for enthusiasts, but fortunately, Summit Racing has stepped up to the challenge.
Summit Racing SPC Small-Block: A High-Quality Alternative
Recognizing the growing need, Summit Racing has partnered with BluePrint Engines to develop a new iron block, the Street, Performance, and Competition (SPC). Cast in Germany using advanced manufacturing techniques, these blocks are finished with precision CNC machining in the USA. The result? A block that meets the demands of high-performance builds, with impressive attention to quality and detail.
Key Features of the SPC Small-Block
- Materials and Design: The SPC block is made from Class 35 iron alloy, with nodular iron main caps for added strength. The block features an upgraded oiling system, with dedicated lubrication to the mains, ensuring optimal performance for the engine’s rotating assembly.
- Cylinder and Deck Specifications: The SPC block offers bore sizes of 4.00 and 4.120 inches, with a maximum possible bore of 4.185 inches. The deck height is set at 9.00 inches, a specification that matches most aftermarket piston designs. The cylinder head bolt holes are blind, providing better sealing and preventing coolant leaks.
- Cooling and Structural Enhancements: The block’s cylinder walls are reinforced, providing durability even with larger bore sizes. The lifter valley walls are redesigned to enhance coolant flow and prevent overheating, while also accommodating a wider range of camshafts and lifter types.
- Hydraulic Roller Camshaft Support: A crucial feature is the support for factory-style hydraulic roller camshafts. The block includes pre-cast pedestals for the lifter spider and taller lifter bores, ensuring compatibility with factory roller lifters.
- Improved Machining Accuracy: Using Makino CNC machines, Summit ensures that all the critical machining processes—such as lifter bore orientation and cam centerline alignment—are executed with pinpoint precision. This level of accuracy contributes to better valve timing, ultimately improving engine performance.
- Additional Features: The block also accommodates a variety of other options, including a two- or one-piece rear main seal configuration, provisions for mechanical fuel pumps, and multiple freeze plug locations. Furthermore, the block is designed with clearance for up to a 3.75-inch stroke crank, providing flexibility for builders looking to maximize engine displacement.
Performance Potential and Value
While the SPC small-block is priced at just over $2,000, this may actually offer more value than many aftermarket alternatives. The cost of refurbishing an old, used block with machine shop services often exceeds the price of a new SPC block. With its modern features, such as priority main oiling, high-strength materials, and a carefully designed cooling system, this new block presents a high-quality option for enthusiasts looking to build a high-performance engine without breaking the bank.
Summit Racing’s SPC small-block is especially suited for builders aiming for substantial horsepower—500 to 700+ horsepower builds are entirely feasible. There are even reports of blown applications pushing the block to 1,500 horsepower, demonstrating its durability under extreme conditions.
Conclusion
For those looking to build a high-performance engine on a reasonable budget, Summit Racing’s SPC small-block offers an exciting option. With advanced features, superior machining, and a focus on performance, it stands as a strong alternative to the rapidly disappearing pool of original small-block Chevy cores. Whether you’re looking to build a weekend warrior or a serious competition engine, this block brings new possibilities within reach.
