ATK HP98M Chevy 350 Mid Dress Engine 345HP

Engine Specifications: HP: 345 TQ: 400 Block: OE block 4 bolt main 1pc seal 1987-2000 Bore/Stroke: 4.040 x 3.480 Displacement: 350 Crankshaft: OE Reground external balance rear of crank/internal balance front of the crank Rods: OE powder metal 5.7” Pistons: Hypereutectic 9.1:1 compression Rings: Moly Camshaft: Hyd. roller Cam Specs: 220/224 @50 .495in/.502ex 110LSA Timing Chain: Double roller Cylinder Heads: ATK cast iron 76cc/165cc 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 high volume Balancer: PowerBond internal balance 8” #PB1046-N Flexplate/Flywheel: Pioneer #FRA-159 external balance 168 tooth Intake Manifold: ATK dual plane intake Distributor: HEI (Iron gear) Water Pump: OE long pump Recommended Components: Carburetor: Quick Fuel 680CFM vacuum secondary’s with electric choke #HR-680 Fuel Pump: Holley mechanical 110GPH #12-327-11 Spark Plugs: Champion #RV12C Spark Plug Wires: 8mm Engine Info: Oil: Conventional / Non synthetic 10W30 with Comp Cam zinc additive #159 for first 3000 miles Oil Filter: Wix or K and N per application Timing: 34-36 Degrees Spark Plug Gap: .035” Firing Order: 18436572 Octane: 91+ Stall Converter: 2200-2500 Exhaust: 1 5/8 Headers Disclaimer: The parts listed are ATK’s