Engine Specifications

Power Ratings:

• Horsepower: 420 @ 5,800 RPM
• Torque: 408 lb/ft @ 4,500 RPM

Block Information:

• Cast iron
• 4-bolt main
• 1-piece rear main seal
• Passenger side dipstick 
• Displacement: 350 cubic inch

Rotating Assembly:

• Crankshaft: Forged steel shot-peened 3.480 in. Stroke
• Balance: Internal Front, External rear (Includes 153-tooth 1987-Up style flexplate)
• Rods: Forged powdered metal
• Compression Ratio: 9.72:1
• Pistons: Hyperuetectic aluminum

Camshaft Specs:

• Camshaft: Hydraulic roller
• Cam Duration @ .050 in.: Intake 208 / Exhaust 221
• Cam Lift: Intake .474 in. / Exhaust .510 in.
• Lobe Separation Angle: 111
• Aluminum roller style rocker arms with 1.5:1 ratio

Cylinder Head Information:

• Cylinder Heads: Fast Burn aluminum
• Combustion Chamber: 62 cc
• Valve Size: 2.000 in. Intake / 1.550 in. Exhaust
• Rocker Arms: Stamped steel 1.5

Oil Pan Information:

• Oil Pan: Black 4 quart

  Long Block Includes

• Short Block
• Camshaft
• Timing Set
• Cylinder Heads
• Valve Covers
• Timing Cover
• Oil Pan
• Oil Pump & Pickup Tube
• EFI Intake Manifold with Controller
• Distributor
• Balancer
• Water Pump
• Flexplate 153-tooth 12.750 in.

Notes:

• This engine has provisions for a mechanical fuel pump.
• Requires Premium Fuel with 91+ octane 
• 36-degrees ignition timing at 4,000 RPM
• Max RPM 5,800

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 RPMs, with no load on the engine for the first 30 minutes. Let the engine cool down completely and repeat the process 2-3 more times. Do not idle the engine for an extended period at this time, this is critical to breaking 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 RPMs (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 additives, until about 4,000 miles. At that point, you may run a quality 10w30 synthetic oil if you choose. The use of oil with zinc or a zinc additive for the life of your engine is recommended.

19433043 supersedes 19432107, 19417782

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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