Revamp your old car with this ATK HP91 Chevy 350CI 87 Octane Engine 345HP Base. It is carefully assembled and balanced by experts with top-notch quality components that will deliver consistent performance for years. Thanks to its noticeable idle, streetable 365 horsepower along with 400 ft.lb torque, it is a perfect choice for high-powered muscle cars and street rods.
- Horsepower: 365
- Torque: 400 lbs./ft.
- Block: Seasoned OE 4 Bolt Main 1pc Seal Roller Block P/S Dipstick
- Bore/Stroke: 4.040 x 3.480
- Displacement: 350 C.I.D.
- Crankshaft: OE Cast Crank 3.480" Stroke Externally Balanced Rear/Internal Front 1pc.
- Connecting Rods: OE Powder Metal 5.700" Stock Bolts
- Pistons: Hypereutectic Dished
- Piston Rings: Moly Rings
- Compression Ratio: 8.9:1 Compression
- Camshaft: Hydraulic Roller
- Camshaft Specifications: 220/224 @050 .528in/.536ex 112LSA
- Camshaft Bearings: Installed & Clocked to OEM Position
- Cylinder Heads: ATK American Made Aluminum 64cc/185cc 2.02/1.60
- Freeze Plugs: Brass Installed & Sealed
- Rocker Arms: Stamped Steel 1.6 Ratio
- Oil Galley Plugs: Installed & Sealed
- Oil Pan: OE 5qt.
- Weight: 350
ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.
ATK High Performance GM 350 365 HP Stage 1 Long Block Crate Engines
• Oil: 10W30
• Oil Filter: Wix or K&N Recommended Per Your Application
• Fuel Delivery: Quick Fuel Carburetor 680cfm #HR-680-VS
• Intake Manifold: Weiand Stealth Dual Plane #8150
• Spark Plugs: Autolite #3923
• Spark Plug Gap: .035"
• Harmonic Balancer/Damper: POWERBOND Internally Balanced 8" #PB1046-N
• Flex Plate / Flywheel: Externally Balanced 168 Tooth
• Timing: 34-36 Degrees Total
• Water Pump: Long Water Pump
• Firing Order: 1 8 4 3 6 5 7 2
• Exhuast: 1 5/8 Headers
• Fuel Pump: Holley 110GPH Mechanical #12-327-11
• Fuel: 91+ Octane
• Ignition: MSD HEI #8362
• Automatic Transmission Stall Converter: 2200-2500
• Balancer: Internal balance
• Carburetor: Quick Fuel 680cfm vacuum secondary electric choke #793-HR-680-VS
• Distributor: HEI (iron gear)
• Flexplate/Flywheel: External balance 1987-Up
• Intake Manifold: Weiand Stealth dual plane #925-8150
• Fuel Pump: Holley Mechanical 110gph #510-12-327-11
• Spark Plugs: Autolite #417-3923
• Spark Plug Wires: 8mm
• Water Pump: OE long pump
Disclaimer: The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work for their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.
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