Best 347 Stroker Kit: Practical Features for Easier Everyday Use

A strong 347 stroker setup delivers matched bore, stroke, rod, piston, and compression details for builders working with a small-block Ford, but the right choice depends on whether you need pistons only or a complete rotating assembly. The supplied products include two MAHLE SBF 347 piston sets with 3.4-inch stroke and 5.4-inch rod specifications, plus several Chevrolet, powersports, Harley-Davidson, and motorcycle kits that are not direct 347 SBF replacements. That makes application verification the essential first step.

For a Ford 347 build, compare the 4.030- or 4.032-inch bore, piston dish, compression ratio, pin size, and set contents. For a broader engine rebuild, the Eagle and SCAT assemblies offer different combinations of crank, rods, pistons, rings, bearings, dampers, or flexplates.

The closest matches for a 347 SBF application are the MAHLE 930249130 and MAHLE 930244732 piston sets. Both specify a 3.4-inch stroke, 5.4-inch rod, .927-inch pin, and eight pistons; the first lists a 4.030-inch bore, -16cc dish, and 9.0 compression ratio, while the second lists a 4.032-inch bore, -6cc dish, and 10.1 compression ratio. They are piston sets, not complete rotating assemblies.

Confirm bore, compression target, and required crank, rods, rings, and bearings before ordering.

347 Stroker Kits Compared

Image	Product	Buy
Best Pick 1	Mahle 930249130 MS Piston Set (SBF 347ci 4.030in Bore 3.4in Stroke 5.4in Rod .927 Pin -16cc 9.0 CR Set of 8) Best for: Ford Small Block Brand: MAHLE | Item model number: ‎930249130	View on Amazon
Best Pick 2	Eagle B13005L03068 Balanced Rotating Assembly Kit: Chevrolet, 350-1 pc rear seal, 168 t Best for: Performance Rotating Assembly Brand: Eagle | Item Weight: ‎120 pounds	View on Amazon
Best Pick 3	Eagle Chevrolet Small Block 383 Rotating Assembly 4.030in Bore 3.750in Stroke Best for: Balanced Rotating Assembly Brand: Eagle | Item Weight: ‎0.01 ounces	View on Amazon
Best Pick 4	Hot Rods New Bottom End Kit CBK0023 Compatible with/Replacement for Honda CR 125 R 2000 Best for: Engine Bottom End Brand: Hot Rods | Item Weight: ‎9.1 pounds	View on Amazon
Best Pick 5	Scat Crankshafts SBC 383 Rotating Assembly Int. Balance Best for: Honda Motorcycle Engine Brand: Scat Crankshafts | Item Weight: ‎82.8 pounds	View on Amazon

How We Compared These Products

We compared dimensions, capacity, materials, compatibility, included components, and care requirements across many Amazon listings. These details matter because the product must fit the available space, intended use, setup requirements, and maintenance routine. After examining the wider field, we selected 10 products from MAHLE, Eagle, Hot Rods, Scat Crankshafts, S&S Cycle, and Eagle Specialty Products.

The shortlist includes products such as Mahle 930249130 MS Piston Set (SBF 347ci 4.030in Bore 3.4in Stroke 5.4in Rod .927 Pin, Eagle B13005L03068 Balanced Rotating Assembly Kit: Chevrolet, and Hot Rods New Bottom End Kit CBK0023 Compatible with/Replacement for Honda CR 125 R Every recommendation is tied to information stated for that specific product; unclear or missing features were treated as unknown rather than filled with assumptions.

Detailed Reviews: Best 347 Stroker Kit

1. Mahle 930249130 MS Piston Set (SBF 347ci 4.030in Bore 3.4in Stroke 5.4in Rod .927 Pin -16cc 9.0 CR Set of 8)

Best for: SBF 347ci engine builds.

This Mahle Motorsport piston set is engineered for SBF 347ci engines with a 4.030-inch bore and 3.4-inch stroke. It features -16cc dish pistons, enabling a 9.0:1 compression ratio for optimal performance in a variety of applications.

The Mahle 930244732 piston kit is designed for SBF 347ci engines, featuring a 4.032-inch bore and 3.4-inch stroke. With -6cc dish pistons, it achieves a 10.1:1 compression ratio, contributing to optimal performance and outstanding driving dynamics. Manufactured in the United States, these pistons are made up of good quality products for reliable engine operation.

Product Details

Pros

• Engineered for SBF 347ci engines
• 4.030-inch bore and 3.4-inch stroke
• -16cc dish pistons
• 9.0:1 compression ratio

Cons

• Set of 8 pistons

Ideal for builders targeting a 9.0:1 compression ratio in their SBF 347ci engine builds, this set requires careful consideration of piston-to-valve clearance for proper fitment.

2. Eagle B13005L03068 Balanced Rotating Assembly Kit: Chevrolet, 350-1 pc rear seal, 168 t

Best for: Balanced rotating assembly builds.

This Eagle balanced rotating assembly kit for Chevrolet 350 engines includes a 3.750-inch cast crank, 5.700-inch I-beam rods, and hyper eutectic KB pistons. It is pre-balanced and comes with ARP 8740 bolts, plasma-moly rings, and King bearings.

The Eagle B13005L03068 rotating assembly kit provides a balanced foundation for Chevrolet 350 builds. It features a 3.750-inch cast crank, 5.700-inch I-beam rods with ARP 8740 bolts, and -7cc flat top hyper eutectic pistons for a 4.030-inch bore. This kit includes plasma-moly rings, King bearings, a damper, and a 168-tooth flexplate for a 1-piece rear main seal.

Product Details

Pros

• Balanced rotating assembly
• 3.750-inch cast crank
• 5.700-inch I-beam rods
• -7cc flat top pistons

Cons

• 1-piece rear main seal specific

Suitable for Chevrolet 350 engine builds requiring a balanced rotating assembly with a 1-piece rear main seal, this kit is designed for external balance applications.

3. Eagle Chevrolet Small Block 383 Rotating Assembly 4.030in Bore 3.750in Stroke

Best for: Small block Chevy stroker builds.

This Eagle rotating assembly kit for Small Block Chevy engines features a forged crank and forged pistons with a 3.750-inch stroke and 4.030-inch bore. It includes 6.000-inch H-beam rods, providing a robust foundation for performance builds.

The Eagle 12012030 rotating assembly is designed for Small Block Chevy engines, offering a 383 CID displacement with a 3.750-inch stroke and 4.030-inch bore. It utilizes forged components, including 6.000-inch H-beam rods, for enhanced durability. This kit is intended for internal balance applications, providing a solid base for engine reconstruction.

Product Details

Pros

• Forged crank and pistons
• 3.750-inch stroke
• 4.030-inch bore
• 6.000-inch H-beam rods

Cons

• Proposition 65 warning

This internal balance rotating assembly is ideal for Small Block Chevy engine builds seeking a 383 CID displacement, but users should be aware of California Proposition 65 warnings.

4. Hot Rods New Bottom End Kit CBK0023 Compatible with/Replacement for Honda CR 125 R 2000

Best for: Powersports engine rebuilding.

The Hot Rods CBK0023 bottom end kit is designed for Honda CR 125 R 2000, offering a complete solution for engine rebuilding. It includes a fully assembled crankshaft, main bearing and seal kit, and a comprehensive gasket and seal kit.

This Hot Rods bottom end kit simplifies engine rebuilding for the Honda CR 125 R 2000. It provides a factory-trued crankshaft, original main bearings, and seals, along with a complete top and bottom end gasket and seal kit. This all-in-one package ensures all necessary components are present for a full engine reassembly.

Product Details

Pros

• Complete engine rebuild kit
• Factory-trued crankshaft
• Main bearing and seal kit included
• Full gasket and seal kit

Cons

• OE replacement or stroker version not specified

This kit is a comprehensive solution for rebuilding Honda CR 125 R 2000 engines, providing all essential bottom end components for a straightforward reassembly.

5. Scat Crankshafts SBC 383 Rotating Assembly Int. Balance

Best for: SBC 383 engine builds.

The Scat Crankshafts SCA1-90455BI is a SBC 383 rotating assembly kit designed for internal balance. It includes forged pistons, providing a strong foundation for performance-oriented engine builds.

This Scat Crankshafts SBC 383 rotating assembly is engineered for internal balance, ensuring smooth operation. It features forged pistons, contributing to enhanced durability and performance. The kit is designed to be a comprehensive solution for builders looking to assemble a 383 cubic inch engine with a focus on strength and reliability.

Product Details

Pros

• SBC 383 rotating assembly
• Internal balance design
• Forged pistons included
• Durable construction

Cons

• Specific stroke and bore not detailed

This internally balanced SBC 383 rotating assembly is suitable for engine builders prioritizing durability with its forged piston design, but specific dimensions require further verification.

6. Hot Rods New Bottom End Kit for KTM 300 XC-W 2008-2014 CBK0011

Best for: Powersports engine rebuilding.

The Hot Rods CBK0011 bottom end kit is specifically designed for KTM 300 XC-W models from 2008-2014. It provides a fully assembled crankshaft, main bearing and seal kit, and a complete engine gasket and seal kit for comprehensive engine rebuilding.

This Hot Rods bottom end kit simplifies the rebuilding process for KTM 300 XC-W 2008-2014 engines. It includes a factory-trued crankshaft, original main bearings and seals, and a complete top and bottom end gasket and seal kit. This ensures all necessary components are provided for a thorough engine reassembly.

Product Details

Pros

• Complete engine rebuild kit
• Factory-trued crankshaft
• Main bearing and seal kit included
• Full gasket and seal kit

Cons

• OE replacement or stroker version not specified

This kit is an ideal choice for KTM 300 XC-W owners needing to rebuild their engine, offering all essential bottom end components for a complete and straightforward assembly.

7. S&S Cycle S&S 9.1:1 Sidewinder 96″ Shovelhead Kit 91-9134

Best for: Shovelhead engine upgrades.

The S&S Cycle Sidewinder 96" Shovelhead Kit is a big bore stroker kit designed to upgrade stock 74" or 80" H-D. Shovelhead engines to 93" or 96" displacement. It includes high tensile cast iron cylinders and forged pistons.

This S&S Cycle Sidewinder Big Bore Stroker Kit enables an upgrade from stock 74" or 80" H-D. Shovelhead engines to 93" or 96" displacement. It features 3.625" bore high tensile cast iron cylinders, forged pistons with wrist pins and rings, and a dynamically balanced S&S flywheel assembly with heavy-duty connecting rods and mainshafts.

Product Details

Pros

• Big bore stroker kit
• Upgrades to 93" or 96" displacement
• High tensile cast iron cylinders
• Dynamically balanced flywheel assembly

Cons

• Proposition 65 warning

This kit is designed for H-D. Shovelhead owners seeking a significant displacement increase, but users should be aware of California Proposition 65 warnings.

8. Mahle 930244732 Piston Kit (MS Set SBF 347ci 4.032in Bore 3.4in Stroke 5.4in Rod .927 Pin-6cc 10.1 CR Set of 8), 1 Pack

Best for: SBF 347ci engine builds.

This Mahle Piston Kit is engineered for SBF 347ci engines with a 4.032-inch bore and 3.4-inch stroke. It features -6cc dish pistons, achieving a 10.1:1 compression ratio for enhanced driving dynamics and optimal performance.

The Mahle 930244732 piston kit is crafted for SBF 347ci engines, featuring a 4.032-inch bore and 3.4-inch stroke. With -6cc dish pistons, it achieves a 10.1:1 compression ratio, contributing to optimal performance and outstanding driving dynamics. Manufactured in the United States, these pistons are made up of good quality products for reliable engine operation.

Product Details

Pros

• Engineered for SBF 347ci engines
• 4.032-inch bore and 3.4-inch stroke
• -6cc dish pistons
• 10.1:1 compression ratio

Cons

• Set of 8 pistons

Ideal for builders targeting a 10.1:1 compression ratio in their SBF 347ci engine builds, this set requires careful consideration of piston-to-valve clearance for proper fitment.

9. Eagle B13005E030 Balanced Rotating Assembly Kit: Chevrolet, 350

Best for: Chevrolet 350 engine builds.

The Eagle B13005E030 balanced rotating assembly kit for Chevrolet 350 engines features 5.700-inch I-beam rods and -7cc flat top pistons. It is externally balanced and includes a street damper and 168-tooth automatic transmission flexplate.

This Eagle Specialty Products rotating assembly kit is designed for Chevrolet Small Block 350 engines, offering a 383 CID displacement. It features 5.700-inch I-beam rods and -7cc flat top pistons, achieving a 11.7:1 compression ratio with 58cc heads. The kit is externally balanced and includes a street damper and a 168-tooth automatic transmission flexplate.

Product Details

Pros

• Balanced rotating assembly
• 5.700-inch I-beam rods
• -7cc flat top pistons
• External balance

Cons

• Proposition 65 warning

This externally balanced rotating assembly is suitable for Chevrolet 350 engine builds aiming for a 383 CID displacement, but users should be aware of California Proposition 65 warnings.

10. S&,S Cycle 124&Prime, Wrinkle Black Hot Set-Up Kit 900-0564

Best for: Big bore motorcycle engines.

The S&S Cycle 124" Hot Set-Up Kit is a performance kit designed for big bore engines, featuring a 4.625-inch stroke and 4.125-inch bore. It achieves an 11.0:1 compression ratio and is finished in wrinkle black powder coat.

This S&S Cycle performance kit provides a 124-inch displacement increase with a 4.625-inch stroke and 4.125-inch bore, achieving an 11.0:1 compression ratio. It allows reuse of stock crankcase, oil pump, and cam cover, retaining the original engine serial number. The wrinkle black powdercoat finish on the heads matches factory aesthetics for a sleeper advantage.

Product Details

Pros

• Big bore performance kit
• 124-inch displacement
• 4.625-inch stroke
• 11.0:1 compression ratio

Cons

• Proposition 65 warning

This kit is ideal for street riding applications seeking a significant displacement and power increase on stock crankcases, but users should be aware of California Proposition 65 warnings.

What Buyers Often Overlook

347 SBF sizing: bore, stroke, rod, and compression

For a 347 SBF build, the supplied MAHLE sets align on the key 3.4-inch stroke, 5.4-inch rod, and .927-inch wrist-pin dimensions, but they differ in bore and compression details. MAHLE 930249130 specifies a 4.030-inch bore, -16cc piston volume, and 9.0 compression ratio. MAHLE 930244732 specifies a 4.032-inch bore, -6cc piston volume, and 10.1 compression ratio.

Those differences can change fit and the final engine combination, so the piston selection must match the machined cylinder bore and intended compression target. Both listings describe a set of eight pistons, but neither listing identifies a crankshaft, connecting rods, bearings, rings, or balancing components.

Treat them as piston kits rather than complete stroker assemblies, and verify the engine’s existing parts and machining requirements before purchase.

The Key Product Trade-Off

Complete assemblies versus application-specific kits

A complete rotating assembly can reduce the number of separate components to source, but the supplied alternatives are for different engine families and should not be treated as 347 SBF kits. Eagle B13005L03068 is a Chevrolet 350 assembly with a 3.750-inch cast crank, 5.700-inch I-beam rods, hypereutectic -7cc pistons, rings, bearings, damper, and 168-tooth flexplate. Eagle 12012030 and the SCAT SBC 383 assembly are also Chevrolet 383 products.

S&S Cycle products target Harley-Davidson Shovelhead or 124-inch applications, while Hot Rods kits fit specific Honda CR125R or KTM 300 XC-W engines. The practical trade-off is scope versus compatibility: an assembly may include more matched parts, but bore, stroke, balance, transmission interface, and engine family must all agree.

Best 347 Stroker Kit: Buyer's Guide

Fit, Dimensions, and Compatibility

Compare the listed dimensions with the intended counter, cabinet, appliance, storage, or installation space. Confirm model compatibility and connection requirements where they are supplied. A useful feature cannot compensate for a product that does not physically fit or work with the buyer’s existing setup.

Capacity, Output, and Operating Format

Match listed capacity, volume, output, and operating mode to the actual household or work routine. Larger figures can support heavier use, while a smaller format may be easier to place and maintain. Treat daily output, immediate storage, and container capacity as separate specifications when the listing distinguishes them.

Materials, Construction, and Care

Use the listed materials and care instructions to judge cleaning effort, storage conditions, and compatibility with the intended use. Dishwasher, freezer, food-contact, or weather-related claims are included only when supplied for that product. Check whether routine care fits the way the product will be used.

Included Components and Setup Needs

Review the included components before planning installation or first use. Hoses, adapters, lids, paddles, bowls, brushes, controls, and manuals vary by listing. Confirm power, water, assembly, or accessory requirements from the supplied product information rather than assuming that separately pictured parts are included.

Which Should You Choose?

Choose MAHLE 930249130 when the SBF 347 build calls for a 4.030-inch bore, -16cc piston volume, and listed 9.0 compression ratio. Choose MAHLE 930244732 when the 4.032-inch bore and listed 10.1 compression ratio better match the build. Select neither as a complete kit if you still need the crankshaft, rods, rings, bearings, or balancing hardware, because the listings identify piston sets only.

Buyers building a Chevrolet 383 should instead examine the Eagle or SCAT rotating assemblies, while Harley-Davidson and powersports rebuilders should stay with the S&S Cycle or application-specific Hot Rods products. Confirm engine family, bore, stroke, balance, and included components against the build sheet before ordering.

Quick Buying Checklist

• Confirm the complete dimensions against the available space.
• Verify model, accessory, connection, and appliance compatibility.
• Match capacity or output to the expected amount of use.
• Compare materials and care instructions with the maintenance routine.
• Check the included components before planning setup or first use.
• Confirm listed power, water, storage, or installation requirements where applicable.

Frequently Asked Questions

What is a stroker kit?

A stroker kit increases engine displacement by using a crankshaft with a longer stroke. This typically involves new pistons, connecting rods, and a crankshaft. The goal is to achieve more power and torque from the existing engine block by increasing the volume displaced by the pistons.

What are the benefits of a stroker kit?

Stroker kits primarily enhance an engine’s performance by increasing displacement. This leads to greater torque and horsepower output.

What is the difference between balanced and unbalanced rotating assemblies?

Balanced rotating assemblies are precisely weighted to reduce vibration and stress on the engine. Unbalanced assemblies may require external balancing by a machine shop. For optimal engine longevity and smooth operation, a balanced assembly is generally preferred, especially for high-performance applications.

What engine families are commonly stroker kits designed for?

Stroker kits are commonly designed for popular engine families like Ford’s Small Block (SBF) and Chevrolet’s Small Block (SBC). These kits allow enthusiasts to increase the displacement of these well-established engine platforms for improved performance and power output.

Are stroker kits suitable for all engine builds?

Stroker kits are best suited for performance-oriented builds aiming for increased power and torque. They require careful consideration of compatibility with the existing engine block and supporting components. For daily drivers or stock restorations, a stroker kit might be overkill or introduce unnecessary complexity.

Final Words

Selecting the right stroker kit depends on your specific engine and performance goals. For Ford Small Block engines aiming for increased displacement, kits like Mahle’s offer precise options. For Chevrolet applications, Eagle and Scat provide balanced rotating assemblies.

Always ensure compatibility with your engine block and intended use.