Overview

ATK High Performance GM 350 Vortec 350 HP Stage 3 Long Block Crate Engines with EFI

ATK High Performance GM 350 Vortec 350 hp Stage 3 long block crate engines with EFI are designed for better drivability and trouble-free cold starts with no tuning required, regardless of elevation, driving habits, or part swap! Based around FiTech Self-Learning EFI systems, these engines come complete from throttle body down to the oil pan. The only thing you'll need is to supply is the fuel system--inline, in-tank, or the FiTech Fuel Command Center. They're dyno-tested with your EFI system and ready to go!

Engine specifications:

* HP: 350
* TQ: 400
* Block: OE roller block 4-bolt main 1-pc. seal 1996-2000
* Bore/Stroke: 4.040 in. x 3.480 in.
* Displacement: 350CI
* Crankshaft: OE reground external balance rear of crank/internal balance front of the crank
* Rods: OE powder metal 5.7 in.
* Pistons: Hypereutectic 9.5:1 compression
* Rings: Moly
* Camshaft: Hyd. Roller
* Cam Specs: 220/224 @ 50 .495in/.502ex 110LSA
* Timing Chain: Double roller
* Cylinder Heads: Vortec cast iron 67cc 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: Externally balanced – Pioneer #FRA-159
* Intake Manifold: ATK HP dual plane
* Distributor: HEI (Iron Gear)
* Water Pump: OE long pump
* EFI System: Fitech Go Street EFI 400HP (throttle body, wire harness and hand held unit included)

* Fuel Pump: Not Provided - must run electric pump or mechanical fuel pump with Fitech fuel command center
* Spark Plugs: Autolite #605
* Spark Plug Wires: 8mm

Engine info:

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

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