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Horsepower & Torque: 375 Horsepower / 460 ft. lbs. Torque
Cylinder Heads: Cast Iron - Magnum
Compression Ratio: 9.8:1
Camshaft: Flat Tappet - .474 Intake / .474 Exhaust L and 233 Intake / 240 Exhaust Duration @ .050 - 110° LSA
Pistons: Forged
Crankshaft: Cast Crank - 4.000" Stroke and Forged 6.123" Rods
Fuel Recommendation: 91+ Octane
- Description
- Engine Specs
- Parts & Accessories
- Warranty
Overview:
This classic small-block engine package delivers 375 horsepower and 460 ft-lbs. of torque with a pump-gas-friendly 9.8:1 compression ratio, making it an ideal choice for street rods, muscle cars, and vintage builds. It features Magnum cast iron heads, a traditional flat tappet cam, a cast crankshaft, and durable forged pistons for a reliable and responsive powerband. Fuel delivery is handled by a proven Holley Classic 750cfm vacuum secondary carburetor with manual choke, mounted on a high-flow intake manifold for strong midrange performance. The package includes a dipstick, valve covers, oil pan, and timing cover, offering a complete, ready-to-run engine setup with a perfect blend of old-school performance and dependable street manners.
Description:
- Horsepower & Torque: 375 Horsepower / 460 ft. lbs. Torque
- Compression Ratio: 9.8:1
- Magnum Cast Iron Heads
- BluePrint Engines Flat Tappet Cam
- BluePrint Engines Cast Crankshaft
- BluePrint Engines Forged Pistons
Block:
- Hand-Picked Seasoned Magnum Block
- Square and Parallel Decked
- Align Honed Main Bearing Bore
- Cylinders Honed on Computer Controlled Machine to Within .0002 Straightness and Roundness
- Cylinders are Sonic Tested for Thickness
- 2-Bolt Main
- 4.040" Bore
- 2-Piece Rear Main Seal
- Mech Fuel Pump Provision: Yes
Rotating Assembly:
- Cast Crankshaft
- 4.000" Stroke
- Forged Magnum 6.123" Connecting Rods w/ 150,000 PSI Bolts
- Forged Pistons
- Externally Balanced Front and Rear
Cylinder Heads:
- NEW Magnum Cast Iron Heads
- Hardened Retainers and Springs
- 1.92" Swirl Polished Intake Valves
- 1.625" Swirl Polished Exhaust Valves
- Hardened Push Rods
Cam Specs:
- Flat Tappet
- .474 Intake / .474 Exhaust Lift
- 233 Intake / 240 Exhaust Duration
- @.050-110 Degree Lobe Separation
Ignition Timing:
- 34 Degrees Total at 3500 RPM
Also Includes:
- Holley Classic 750cfm Vacuum Secondary Carburetor w/ Manual Choke
- Edelbrock Performance Intake Manifold - BPP7577
- BluePrint Dipstick - BPP9224
- Tall Valve Covers
- Timing Cover
- Oil Pan
Notes:
- If installing with a Manual Transmission with .750" input shaft, Recommended Pilot bearing is PN FC-69907.
- Recommended Pilot OD is 1.81"
Blocks
- Hand-Picked Seasoned Magnum Block
- Square and Parallel Decked
- Align Honed Main Bearing Bore
- Cylinders Honed on Computer Controlled Machine to Within .0002 Straightness and Roundness
- Cylinders are Sonic Tested for Thickness
- 2-Bolt Main
- 4.040" Bore
- 2-Piece Rear Main Seal
- Mech Fuel Pump Provision: Yes
Cylinder Heads
- NEW Magnum Cast Iron Heads
- Hardened Retainers and Springs
- 1.92" Swirl Polished Intake Valves
- 1.625" Swirl Polished Exhaust Valves
- Hardened Push Rods
Ignition Timing
Initial Timing 10-16 - Total Timing 32-34
Spark Plug
.035 in.
Firing Order
1,8,4,3,6,5,7,2
Rotating Assembly
- Cast Crankshaft
- 4.000" Stroke
- Forged Magnum 6.123" Connecting Rods w/ 150,000 PSI Bolts
- Forged Pistons
- Externally Balanced Front and Rear
Cam Specs
- Flat Tappet
- .474 Intake / .474 Exhaust Lift
- 233 Intake / 240 Exhaust Duration
- @.050-110 Degree Lobe Separation
Stall Converter
1800-2200 RPM
Also Includes
- Holley Classic 750cfm Vacuum Secondary Carburetor w/ Manual Choke
- Edelbrock Performance Intake Manifold - BPP7577
- BluePrint Dipstick - BPP9224
- Tall Valve Covers
- Timing Cover
- Oil Pan
Notes
- If installing with a Manual Transmission with .750" input shaft, Recommended Pilot bearing is PN FC-69907.
- Recommended Pilot OD is 1.81"
Your BluePrint engine was dyno tested with the parts and specifications listed below. If you prefer to install a different part, your engine may not produce the horsepower recorded on your dyno sheet.
Parts & Accessories Specs
| Intake Manifold | Edelbrock Performance Intake Manifold - BPP7577 |
|---|---|
| Spark Plug (Not Included) | BPP7938 - NGK 7938 BKR5E |
| Harmonic Balancer (Not Included) | BPP360 |
| Flexplate/Flywheel (Not Included) | BPP727360 |
| Fuel Recommendation | 91+ Octane |
| Recommended Service Oil | BPP10W30 |
| Recommended Oil Filter | BPP21085 - BPP51515 |
| Total Oil Capacity with Production Oil Pan, and Correct Filter | 5 Quarts |
Header Partners:
- Click Here for our Header Partners and recommendations.
Better Than the Rest.
The satisfaction of our customers is our highest priority at BluePrint Engines. Every engine we build is assembled with premium components, balanced to within two grams, and dyno-tested to verify real horsepower and torque before it leaves our facility.
All BluePrint products include warranty protection designed specifically for how they're used. Our complete crate engines carry our industry-leading 30-month / 50,000-mile warranty, offering the confidence and peace of mind serious builders expect. Other BluePrint products—including bare blocks, marine engines, transmissions, race applications, and cylinder heads—feature warranty coverage tailored to their intended use and operating conditions.
For full terms and specific coverage by product category, download our warranty guide below. It contains complete details, limitations, and instructions for warranty registration and claims.
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Register NowEVERY BLUEPRINT ENGINE ACES THE DYNO TEST
We make sure we hit our target horsepower and proper torque with every crate engine. We use an advanced computerized balancer in our in-house dyno testing rooms to get our rotating assemblies within two grams, ensuring silky smooth power over the entire RPM range. That’s precisely why our engines sound and run better than our competitors.
All specs, zero speculation: A comprehensive, dyno-generated printout showing your critical engine specs will accompany your delivered engine — every time. No more guessing or wondering what your installed engine’s real-world peak horsepower and torque ratings actually are. Any doubters in the crowd? Simply flash ‘em your exact engine’s dyno results.