347 Ford Long Block


Nevermind all those old-school naysayers. The 347 Ford Small Block Stroker is the only way to go if you are looking for a street engine upgrade for your 302 Ford. Our 425 HP version was developed to provide excellent low-end torque and acceleration for street driving. Drivability and vacuum at idle are also better than a 331 Stroker with the same peak power level. This would be an excellent addition to a Cobra Kit Car!

Payment Plans Available!paytommorrow_logo 347 Ford Small Block Stroker Crate Engine: F347-HR-C1Get Pre-Approved

Fuel Type

Fuel Type

Pump Gas


Idle Quality

Idle Quality

Best Use

Best Use

Horsepower: 425
Torque: 425
Bore/Stroke: 4.030 x 3.400
Compression: 10:1
Fuel Type: Pump Gas, 93 AKI (USA) / 98 RON
Block: OEM 302
Crankshaft: Cast Steel
Rods: I-Beam, 5140 Forged Steel
Pistons: 4032 Forged Aluminum 5cc valve relief
Bearings: King
Camshaft: Hydraulic Roller
Heads: Aluminum, As-Cast
Valves: Forged Stainless, Chrome Plated
Rocker Arms: Billet Aluminum, Full Roller
Intake: Not Included
Oil Pan: Street / Strip
Valve Covers: Polished Aluminum
Power Adder: Not Included
Fuel Delivery: Not Included
Ignition: Not Included
Dyno Testing Image

Dyno Testing

Dyno testing not included in long block price. Here at Prestige Motorsports, our “Dyno Promise” means that we dyno test every engine we build to verify the quality of our work, the integrity of each component, and the reliability of every engine we construct. Then, we deliver the dyno results for your project directly to you, the customer. Hours for dyno testing will be calculated with the purchase of the fuel and ignition group per engine order.

Engines will produce +/- 2% of advertised power at the flywheel. Advertised power levels are achieved using an electric water pump and specific induction and exhaust systems. Power will vary after pulley systems are installed or if changes are made to the induction or exhaust system (e.g. camshaft, cylinder head, compression, intake manifold, exhaust headers, air filters, etc.). Chassis dyno results measure power at the wheels and only calculate flywheel horsepower. Wheel horsepower is affected by a variety of vehicle-specific criteria including driveline design, body and chassis flex, air intake location, etc. Therefore, calculating flywheel horsepower from wheel horsepower is not an accurate representation of actual flywheel horsepower.

Dyno Graph Image
Warranty Image


This Prestige Motorsports engine is built to order and comes with a 3-year, unlimited miles warranty. Our warranty covers the base engine from intake manifold to oil pan.

Comparable Engines

Product: Current: 347 Ford Long Block 347 Crate Engine 347 Crate Engine
Horsepower: 425 440 500
Torque: 425 420 450
Best Use: Street Street Street/Strip
Max RPM: 6,000 6,000 6,500
Idle Quality: Lopey Rough Rough
Bore/Stroke: 4.030 x 3.400 4.030 x 3.400 4.030 x 3.400
Block: OEM 302 OEM 302 OEM 302
Crankshaft: Cast Steel Cast Steel Cast Steel
Rods: I-Beam, 5140 Forged Steel I-Beam, 5140 Forged Steel I-Beam, 5140 Forged Steel
Pistons: 4032 Forged Aluminum 5cc valve relief 4032 Forged Aluminum 5cc valve relief 4032 Forged Aluminum 5cc valve relief
Oil Pan: Street / Strip Street / Strip Street / Strip
Camshaft: Hydraulic Roller Hydraulic Roller Hydraulic Roller
Heads: Aluminum, As-Cast Aluminum, As-Cast Aluminum, As-Cast
Intake: Not Included Not Included Not Included
Price: $6,999 Starting at $6,499 Starting at $6,999
347 Ford Small Block Stroker Crate Engine: F347-HR-C1

Upgrades & Add-ons

Ready to upgrade your project? Add a kit from each area below to convert your base engine into a turn-key package. Kits come installed and dyno tested with your engine. Please note that not all of the options listed below are available for every engine. Contact us for more details.

Fuel Supply

Don’t waste time and frustration on that old carburetor. Fuel your engine with a dyno tested system for proven performance.

Ignition System

You'll need a top-notch ignition system for trouble-free performance. Let us customize one for you with everything needed to keep the spark alive.

Pulley Kits & Accessories

Pulleys drive vital components. Let us install a high-quality kit that keeps your engine running and provides max clearance for cooling systems. Available in multiple finishes!