High Performance Crate Engine Small Block Chevy 350ci / 408HP / 414TQ

Name: High Performance Crate Engine Small Block Chevy 350ci / 408HP / 414TQ
Brand: ATK ENGINES
SKU: 059-HP34C
Price: 6139.00 USD
Availability: OutOfStock

Currently Unavailable

This product is no longer available. Please call customer service for assistance at 1-800-345-4545.

Complete Engine

High Performance Crate Engine

Small Block Chevy 350ci

408HP / 414TQ

Complete Engine

Core Details

NOTE:

Core return can be any Small Block Chevy 350ci engine, except 1992-1997 LT1 style engines

Engine Info

Balancer: Internal balance
Carburetor: Quick Fuel 680cfm vacuum secondary electric choke #793-HR-680-VS
Distributor: HEI (iron gear)
Exhaust: 1-5/8" Headers
Firing Order: 18436572
Flexplate: External balance 168 tooth
Fuel Pump: Holley Mechanical 110gph #510-12-327-11
Intake Manifold: Weiand Stealth dual plane #925-8150
Octane: 91+
Oil: 10W30 (Conventional / Non Synthetic)
Oil Filter: Wix or K&N
Spark Plug Gap: .035"
Spark Plugs: Autotile #417-3923
Spark Plug Wires: 8mm
Stall Converter: 2200-2800
Timing: 34-36 Degrees
Water Pump: OE long pump

Disclaimer: The parts listed are ATK's recommendations of parts to be used to obtain the power figures listed. Power figures can vary based on parts used by the end user. Some modifications to the vehicle may be required using these and or other aftermarket parts.

Engine Break-In Procedure

Use or break-in oil or conventional (non-synthetic) 10w30 oil with zinc additive for the first 500 miles of operation. Do not drive for long periods at any single speed, always vary your speed. Do not tow a trailer or put other heavy loads on the vehicle. It is best to avoid long periods of idling during this period. Check the engine oil and coolant levels daily.

Engines with flat tappet hydraulic cams only - Run the engine between 2,000 and 2,500 RPM's, with no-load on the engine for the first 30 minutes. Let the engine cool down completely and repeat process 2-3 more times. Do not idle the engine for any extended period at this time, this is critical to break in the camshaft.

At 500 Miles change the engine oil and filter using conventional (non-synthetic) oil with a zinc additive. Check fuel and ignition settings, adjust valves (where applicable). Drive the next 500 miles normally, without high RPM's (below 5000 RPM), hard use, or extended periods of high loading or long periods of idling.

Change the oil and oil filter again at 1,000 miles. Continue using conventional (non-synthetic) oils and zinc additive, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. Use of oil with zinc or a zinc additive for the life of your engine is recommended.

Please CLICK HERE for ATK Warranty

In 2007, ATK launched a High Performance Division with one of the finest engine shops in the country. By reverse engineering all of their engines, they are able to eliminate any OEM deficiencies. This makes an ATK built crate engine have a superior design over the original engine by incorporating better components when needed. These quality built engines are offered in three different stages for ease of finishing an engine swap. ATK HP engines feature a 24 month/unlimited mile warranty.

Engine Specifications

This engine will require a bigger converter and have a noticable idle, but will produce enough vacuum for power brakes.

Horsepower: 408 hp
Torque: 414 lb/ft

Block Information:

Seasoned OE 4 bolt main 1pc seal 1996-2000
Bore/Stroke: 4.040" x 3.480"
Displacement: 350ci

Rotating Assembly:

Crankshaft: Scat Nodular Iron
Balance: External rear, internal front
Rods: Scat 4340 forged I beam 5.7" with ARP 8740 bolts
Compression Ratio: 10:1
Pistons: Forged
Rings: Moly

Camshaft Specs:

Camshaft: Hydraulic roller
Cam Duration @ .050": Intake 220 / Exhaust 224
Cam Lift: Intake .528" / Exhaust .536"
Lobe Separation Angle: 110lsa
Timing Chain: Double roller

Cylinder Head Information:

Cylinder Heads: ATK American Made aluminum
Combustion Chamber: 64cc
Intake Runner: 195cc
Valve Size: 2.02" Intake / 1.60" Exhaust
Rocker Arms: Biller aluminum roller rockers 1.6 ratio

Oil Pan Information:

Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some Corvettes, and 1962-1967 Chevy II's)
Oil Pump: Melling standard volume

Base Engines