HP99C

• Block: OE roller block 4 bolt main 1pc seal 1996-2000
• Bore/Stroke: up to 4.060” x 3.480”
• Displacement: 350CI

• Crankshaft: OE Reground external balance rear of crank/internal balance front of the crank
• Rods: OE powder metal 5.7”
• Pistons: Hypereutectic 9.4:1 compression
• Rings: Moly
• Camshaft: Hyd. roller
• Cam Specs: 191/194 @50 .414in/.428ex 111LSA
• Timing Chain: Single Roller

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191° Intake | 194° Exhaust

.414 Intake | .428 Exhaust

• Cylinder Heads: Vortec cast iron 64cc 1.94/1.50 • Rocker Arms: Stamped steel 1.5 ratio

• Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some corvettes and 62-67 chevy II’s)
• Oil Pump: Melling STD Volume
• Balancer: Internally balanced – PowerBond #PB1046-N
• Flexplate/Flywheel: Externally balanced – Pioneer #FRA-159
• Intake Manifold: ATK HP dual plane dual plane
• Distributor: HEI (Iron Gear)
• Water Pump: OE long pump
• Carburetor: Quick Fuel 670CFM Vacuum secondary’s electric choke #BR-67256
• Fuel Pump: MUST RUN ELECTRIC FUEL PUMP-NO MECHANICAL FUEL PUMP PROVISIONS
• Spark Plugs: Autolite #605
• Spark Plug Wires: 8mm

Engine Info/RecommendationsNOT INCLUDED

• Oil: Conventional / Non Synthetic 10W30
• Oil Filter: Wix or K&N
• Timing: 34-36 Degrees
• Spark Plug Gap: .035”
• Firing Order: 18436572
• Octane: 91+
• Stall Converter: Stock
• Exhaust: 1 5/8 Headers

290

375

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 in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.