SKU: SRP142068
UPC: 193564250988
MPN: 142068
The SBM 340 F/T Piston Set 4.070 Bore -5cc from Sportsman Racing Products is a forged small block Mopar piston set engineered for high-performance marine and automotive engine builds. This complete eight-piston set features a 4.070-inch bore with precisely engineered ring grooves (1/16 x 1/16 x 3/16 inches) and a -5 cubic centimeter dome design optimized for compression and combustion efficiency in 340 cubic inch displacement engines. Built from forged material, these pistons deliver the strength and thermal stability required for sustained high-rpm operation in performance boating and racing applications.
The -5cc dome specification reduces chamber volume, raising static compression ratio for improved power output and throttle response—critical factors in offshore racing and performance marine engines where every horsepower counts. The 4.070-inch bore sizing is purpose-built for the small block 340 platform, ensuring precise piston-to-cylinder wall clearance and consistent ring seal across all eight cylinders. Ring groove specifications are matched to standard small block Mopar ring sizes, enabling straightforward installation with common replacement ring sets. Forged construction provides superior durability compared to cast pistons, handling the sustained detonation pressures and thermal cycling that marine engines experience during extended high-performance operation.
This piston set is designed for serious engine builders and boat racers upgrading small block 340 power plants for competition and high-output marine use. Whether building a 340 stroker, increasing displacement through boring, or optimizing an existing 340 for tournament fishing or offshore racing, this complete eight-piece set eliminates sourcing individual pistons. Compatibility with standard small block Mopar engine blocks, connecting rods, and ring sets makes installation straightforward for experienced builders. The set's compact shipping dimensions (12 x 5 x 28.5 inches) facilitate handling and storage in shop environments.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
