ATK High Performance Engines at Summit Racing

ATK High Performance GM 350 345 HP Stage 1 Long Block Crate Engines

ATK High Performance GM 350 345 hp/400 lbs.-ft. Stage 1 long block crate engines are classics with great street manners, and vacuum to power all your accessories. These Stage 1 or base engines are designed for those that may have their own component parts already, and who also are interested in completing out the build themselves. Typically ATK GM 350 345 hp base long block engines consist of: * Seasoned OE short block with 4-bolt mains * OE cast crankshaft * OE 5.7 in. powder metal connecting rods * Hypereutectic pistons * Moly piston rings * Hydraulic roller camshaft * 220/224 at .050 in. * .495 in./502 in. lift 110 LSA * ATK cast iron cylinder heads * 76cc combustion chambers * 165cc intake runners * 1.94 in./1.5 in. valves * Stamped steel 1.5 ratio rocker arms * Valve covers * Timing set and cover * Oil pan, high volume oil pump with pick-up tube

3.67 out of 5 stars ( 12 )

$3,198.99

ATK High Performance GM 350 345 HP Stage 3 Long Block Crate Engines

Give your old ride new life with these ATK High Performance GM 350 345 hp/400 lbs.-ft. Stage 3 long block crate engines. These engines are built to perform and look great without breaking your budget. Each engine is expertly assembled, balanced, blueprinted, and topped with quality components, making it a solid, reliable mill to power your muscle car, street rod, or pickup. ATK GM 350 345 hp Stage 3 long block crate engines include: * Handpicked, OE remanufactured block * ATK cast iron 75cc/165cc 1.94/1.50 heads * ATK dual plane intake manifold * Quick Fuel 680 cfm vacuum secondary carburetor * OE crankshaft * OE 5.7 in. powder metal connecting rods * Hypereutectic pistons * Hydraulic roller camshaft .495in/.502ex 110LSA * HEI Distributor, plug wires and plugs * Holley 110 GPH mechanical fuel pump * Valve covers * Timing cover and double roller timing set * 5 qt. oil pan, high volume oil pump with pickup tube * OE style long water pump * PowerBond 8 in. balancer and 168 tooth flexplate

4.0 out of 5 stars ( 1 )

$4,504.99

ATK High Performance GM 350 345 HP Stage 2 Long Block Crate Engines

Give your old ride new life with these ATK High Performance GM 350 345 hp/400 lbs.-ft. Stage 2 long block crate engines. These engines are built to perform and look great without breaking your budget. Each engine is expertly assembled, balanced, blueprinted, and topped with quality components, making it a solid, reliable mill to power your muscle car, street rod, or pickup. ATK GM 350 345 hp Stage 2 long block crate engines include: * Handpicked, OE remanufactured block * ATK cast iron 75cc/165cc 1.94/1.50 cylinder heads * ATK dual plane intake manifold * OE crankshaft * OE 5.7 in. powder metal connecting rods * Hypereutectic pistons * Moly rings * Hydraulic roller camshaft .495in/.502ex 110LSA * Stamped steel 1.5 ratio rocker arms * HEI distributor, plug wires and plugs * Valve covers * Timing cover and double roller timing set * 5 qt. oil pan, high volume oil pump with pickup tube * OE style long water pump * PowerBond 8 in. balancer and 168 tooth flexplate

5.0 out of 5 stars ( 2 )

$3,635.99

ATK High Performance GM 350 Vortec 290 HP Stage 3 Long Block Crate Engines

ATK High Performance GM 350 Vortec 290 hp Stage 3 long block crate engines are perfect replacements for your worn out SBC. They are designed with matched components for reliable performance with extra "go power", and they require an electric fuel pump. ATK Stage 3 or complete dressed engines are engineered for those wanting to drop the engine into their project and fire it up. They have outfitted the engines as completely as possible to save you time and headaches. Typically ATK GM 350 Vortec 290 hp complete long blocks consist of: * OE block bored to 4.060 in. diameter with 2-bolt mains and a one-piece rear main seal * OE reground crankshaft with a 3.480 in. stroke * OE powder metal 5.7 in. length connecting rods * Hypereutectic 9.4:1 compression ratio pistons * Moly piston rings * Hydraulic roller camshaft (191/194 duration at 50, .414/.428 in. lift, 111 LSA) * Cast iron Vortec cylinder heads with 64cc combustion chambers, 165cc intake runners, and come with 1.94 in./1.5 in. valves. * Stamped steel 1.5 ratio rocker arms * Single roller timing set * 5 qt. oil pan ( will not fit Chevelle with steering behind crossmember, some Corvettes, and 1962-67 Chevy II) * Melling standard volume oil pump * Valve covers * Flexplate * ATK HP dual plane intake manifold * Distributor HEI * Cast iron long water pump * Front Powerbond balancer (internally balanced) * Pioneer externally balanced 168 tooth flexplate * Quick Fuel Brawler 670cfm carburetor * Autolite spark plugs (605) with 8mm wires

4.0 out of 5 stars ( 6 )

$3,625.99

ATK High Performance Ford 302 300 HP Stage 2 Long Block Crate Engines

Replace your old, tired mill with ATK High Performance Ford 302 300 hp Stage 2 long block crate engines to give your old ride new life. These engines are designed to be perfect replacements for your old 302, but with a bit more kick. The upgraded engines produce 300 hp and 336 ft.-lbs., while still maintaining a smooth idle and great driving manner. These mills are perfect for daily drivers or mild-mannered street rods. Ford 302 300 hp Stage 2 long block crate engines feature: * Handpicked, remanufactured blocks * OE cast iron cylinder heads * Intake manifold * OE crankshaft and connecting rods * Hypereutectic pistons * Hydraulic roller camshaft * Cam lift- .498 int./.498 exh. * Cam duration @ 0.50- 219 int./219 exh. * 9.0:1 compression * Distributor * Valve covers * Timing cover and timing set * Oil pan, pump, and pickup tube * Water pump * Front damper and flexplate

5.0 out of 5 stars ( 4 )

$4,210.99

ATK High Performance Ford 302 Stock Drop-In Long Block Crate Engines

Classic Ford 302 stock drop-in long block crate engines from ATK High Performance are shipped to you fully dressed. These are basic stock engines with moderate horsepower and torque based off the 80-86 Ford 302 engine. These engines typically make about 240 horsepower on the dynamometer. Additional specs: * Block: seasoned OE roller block * Bore/Stroke: up to 4.060 x 3.000 * Displacement: 302 c.i.d. * Crankshaft: OE Ford cast late model crankshaft (50 oz. imbalance) * OE steel connecting rods 5.4 in. stock bolts * Pistons: hypereutectic * Piston rings: moly rings * Compression Ratio: 8.5:1 * Camshaft: hydraulic flat tappet * Camshaft specifications: OE stock * Camshaft bearings installed and blocked to OEM position * Cylinder heads: OE cast iron * Freeze plugs: brass installed and sealed * Rocker arms: stamped steel 1.5 ratio * Oil galley plugs: installed and sealed * Oil pan: OE 5 qt. front sump * Weight: 430 lbs. * For engine break-in please follow the ATK break-in procedure that is included with the engine.

3.94 out of 5 stars ( 32 )

$3,998.99

ATK High Performance GM 350 390 HP Stage 1 Long Block Crate Engines

Awesome performance and awesome looks combine with these ATK High Performance GM 350 390 hp Stage 1 long block crate engines. They are topped with trick looking parts and they have the power to back them up. These engines are hand-assembled and balanced to help them put out 390 hp and 420 ft.-lbs. of torque that will tear up the street or strip. Whether you are looking to pack some more power in your street rod, muscle car, or truck, ATK has you covered. ATK GM 350 390 hp Stage 1 long block crate engines include: * Handpicked, remanufactured block * ATK High Performance aluminum cylinder heads with 2.020 in. /1.600 ex. valves * OE crankshaft and connecting rods * Hypereutectic pistons * Hydraulic roller camshaft * Valve covers * Timing cover and timing set * Oil pan, pump, and pickup tube

4.4 out of 5 stars ( 15 )

$3,798.99

ATK High Performance GM 350 Vortec 350 HP Stage 2 Long Block Crate Engines

Give your car or truck a little more punch with one of these ATK High Performance GM 350 Vortec 350 hp Stage 2 long block crate engines. These engines are built from the ground up to replace your old, tired mill with a more modern, efficient engine. ATK hand-builds and balances each one these engines to ensure they are great-running, reliable engines that will get you back on the road. 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 Recommended components: * Carburetor: Quick Fuel 680CFM vacuum secondary's electric choke #HR-680 * Fuel Pump: Holley mechanical 110GPH #12-327-11 * 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

3.88 out of 5 stars ( 8 )

$3,688.99

ATK High Performance GM 350 330 HP Stage 1 Long Block Crate Engines

Give your ride new life with ATK High Performance GM 350 330 hp/380 lbs.-ft. Stage 1 long block crate engines. These engines are based on the tried-and-true small block Chevy and are built to perform right out of the box. ATK hand-assembles and balances each engine using top-quality parts to help them produce awesome power. Whether you are replacing an older, worn down engine or just looking for a little more performance, ATK has you covered. Stage 1 long block crate engines include: * Handpicked, remanufactured blocks * ATK cast iron cylinder heads * 76cc chambers * 165cc intake runners * 1.94 in./1.5 in. valves * Stamped steel 1.5 ratio rocker arms * OE crankshaft * OE 5.7 in. powder metal connecting rods * Hypereutectic flat-top pistons * Moly rings * Hydraulic flat tappet camshaft * 465 int./.488 exh. cam lift * 224 int./234 exh. cam duration at 0.50 * 9.1:1 compression * Valve covers * Timing cover and timing set * Oil pan, pump, and pickup tube

3.69 out of 5 stars ( 16 )

$3,099.99

ATK High Performance GM 350 Vortec 315 HP Stage 1 Long Block Crate Engines

Give your truck a little more punch with one of these ATK High Performance GM 350 Vortec 315 hp Stage 1 long block crate engines. These engines are built from the ground up to replace your old, tired mill with a more modern, efficient engine. ATK hand-builds and balances each one these engines to ensure that they are great-running, reliable engines that will get you back on the road. Engines include: * Handpicked, remanufactured blocks * Cast iron Vortec cylinder heads * OE crankshaft and connecting rods * Hypereutectic pistons * Hydraulic roller camshaft * Valve covers * Timing cover and timing set * Oil pan, pump, and pickup tube

3.71 out of 5 stars ( 7 )

$2,988.99

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

Give your car or truck a little more punch with ATK High Performance GM 350 Vortec 350 hp Stage 3 long block crate engines. These engines are built from the ground up to replace your old, tired mill with a more modern, efficient engine. ATK hand-builds and balances each one these engines to ensure that they are great-running, reliable engines that will get you back on the road. 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 * Carburetor: Quick Fuel 680CFM vacuum secondary's electric choke #HR-680 * Fuel Pump: Holley mechanical 110GPH #12-327-11 *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

5.0 out of 5 stars ( 1 )

$4,624.99

ATK High Performance GM 350 TBI 290 HP Stage 1 Long Block Crate Engines

Give your truck a breath of fresh life with ATK High Performance GM 350 TBI 290 hp Stage 1 long block crate engines. These engines are designed to replace your old tired mill with a fresh unit that has a little bit more kick. These engines feature upgraded internals to help them pump out 290 hp and 370 ft.-lbs. of twist that will get your pickup or muscle truck moving. ATK GM 350 TBI 290 hp Stage 1 long block crate engines include: * Handpicked, remanufactured blocks * OE cast iron TBI cylinder heads * OE crankshaft and connecting rods * Hypereutectic pistons * Hydraulic roller camshaft * Valve covers * Timing cover and timing set * Oil pan, pump, and pickup tube

3.0 out of 5 stars ( 6 )

$3,034.99

ATK High Performance Chrysler 360 Magnum 320 HP Stage 1 Long Block Crate Engines

ATK High Performance Chrysler 360 Magnum 320 hp Stage 1 long block crate engines are perfect for a street cruiser offering great street ability, stock idle, and good power. ATK Stage 1 or base engines are designed for those that may have their own component parts already, and who also are interested in completing out the build themselves. Typically ATK Chrysler 360 Magnum 320 hp base engines consist of: * Seasoned OE Magnum block * OE cast crankshaft * OE steel connecting rods * Hypereutectic pistons * Chromoly piston rings * Hydraulic roller camshaft * Magnum cylinder heads * Steel rocker arms * Timing set and cover * Oil pan, oil pump and pick-up tube * Valve covers

3.44 out of 5 stars ( 9 )

$3,298.99

ATK High Performance GM 383 Stroker 415 HP Stage 1 Long Block Crate Engines

Give your ride the extra twist only a stroker can deliver with ATK High-Performance GM 383 Stroker 415 hp Stage 1 long block crate engines. These engines feature quality components and professional assembly to give your car or truck the kick it needs. They produce up to 460 ft.-lbs. of torque—that's enough to get you rolling in a cloud of tire smoke! ATK GM 383 Stroker 415 hp Stage 1 long block crate engine specs: * Seasoned OE 4-bolt main roller block * 4.040 x 3.750 bore/stroke * 383 c.i.d. displacement * Scat nodular iron crankshaft (3.750 in. stroke; one-piece; externally balanced rear/internal front) * Scat 4340 forged I-beam connecting rods (5.700 in.) with ARP bolts * Hypereutectic pistons * Moly piston rings with 9.7:1 compression ratio * Hydraulic roller camshaft with 220/224 duration at 0.050, 0.528 in./0.536 ex. lift, 112LSA * Installed camshaft bearings clocked to OEM position * ATK high-performance aluminum cylinder heads with 2.02/1.60 ex. valves * Installed and sealed brass freeze plugs (oil galley plugs also installed and sealed) * Billet aluminum 1.6 ratio rocker arms * 5 qt. OE oil pan * 350 lbs.

4.75 out of 5 stars ( 4 )

$4,498.99

ATK High Performance GM 350 Vortec 350 HP Stage 1 Long Block Crate Engines

Give your car or truck a little more punch with ATK High Performance GM 350 Vortec 350 hp Stage 1 long block crate engines. These engines are built from the ground up to replace your old, tired mill with a more modern, efficient engine. ATK hand-builds and balances each one these engines to ensure that they are great-running, reliable engines that will get you back on the road. ATK GM 350 Vortec 350 hp Stage 1 long block crate engines include: * Handpicked, remanufactured blocks * Cast iron Vortec cylinder heads * OE crankshaft and connecting rods * Hypereutectic pistons * Hydraulic roller camshaft * Valve covers * Timing cover and timing set * Oil pan, pump, and pickup tube

5.0 out of 5 stars ( 7 )

$3,334.99

Clearance

ATK High Performance Chrysler 5.7 Gen III Hemi 400 HP Long Block Crate Engines

ATK High Performance Chrysler 5.7 Gen III Hemi 400 hp long block crate engines were built in a team effort with Comp Cams. Utilizing ATK remanufactured GEN III 5.7L Hemi engines; they upgraded the camshaft, springs, and pushrods to produce reliable 400+ hp. Features typically include: * Seasoned OE Gen III Hemi block * OE reground crankshaft * OE reconditioned connecting rods * Hypereutectic pistons * Chromoly piston rings * Hydraulic roller camshaft * Aluminum cylinder heads * OE shaft mount rocker arms

3.6 out of 5 stars ( 5 )

$4,798.99

$3,999.50

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$4,798.99

ATK High Performance Chevy LQ9 6.0L Short Blocks

ATK High Performance Chevy LQ9 6.0L short blocks with OE flat top pistons are great beginnings for your mild street build, or just as a replacement for a tired short block. ATK takes the hard work out of your project by selling blocks that are ready to complete yourself. Every great build needs a solid foundation. Start yours with one of ATK's Chevy LQ9 6.0L short blocks. Technical specifications: * Block: Seasoned 6.0L cast no. 364 or 184 * Bore/stroke: 4.030 x 3.622 * Year range: 2001-2007 * Displacement: 370 c.i.d. * Crankshaft: OEM GM 3.622 in. stroke internally balanced 24-tooth reluctor wheel * Connecting rods: OE GM forged powder metal 6.093 in. stock bolts * Pistons: OE hypereutectic flat top with no valve reliefs * Piston rings: Moly rings * Compression ratio: 64cc = 10.7:1, 68cc = 10.2:1, 72cc = 9.8:1 * Camshaft bearings: Installed and clocked to OEM position * Freeze plugs: Brass installed and sealed * Oil galley plugs: Installed and sealed * Weight: 285 lbs.

4.17 out of 5 stars ( 6 )

$3,198.99

ATK High Performance Chevy LQ4 6.0L 460 HP Long Block Crate Engines

ATK High Performance Chevy LQ4 6.0L 460 hp long block crate engines lay down impressive power that can be run with factory fuel injection or retrofitted with a carburetor. They're hand-built, balanced, and blueprinted using top-quality parts. Don't waste time trying to salvage a high-mileage short block when you can get a fresh mill that's ready for your choice of components to make it your own. ATK Chevy LQ4 6.0L 460 hp long block crate engines include: * Handpicked and seasoned 6-bolt main block * Aligned and honed main bores * OE steel crankshaft * 3.622 in. stroke * OE connecting rods * Hypereutectic dish top pistons * Aluminum cylinder heads * Hydraulic roller camshaft * Timing chain and gear set * 1.7:1 ratio rocker arms * 24-tooth reluctor

4.4 out of 5 stars ( 10 )

$5,049.99

ATK High Performance Chrysler 360 Magnum 320 HP Stage 3 Long Block Crate Engines with EFI

ATK High Performance Chrysler 360 Magnum 320 hp Stage 3 long block crate engines with EFI are perfect for a street cruiser, and offer great street ability, stock idle, and good power. Based around FiTech Self-Learning EFI systems, these engines come complete from throttle body down to the oil pan. The only thing you will need is to supply is the fuel system--in line, in tank, or the FiTech Fuel Command Center. Plus they are dyno-tested with your EFI system and ready to go! These Stage 3 engines with EFI set your vehicle up for better drivability and trouble-free cold starts with no tuning required, regardless of elevation, driving habits, or part swap! Typically ATK Chrysler 360 Magnum 320 hp complete EFI engines consist of: * Seasoned OE Magnum block * OE cast crankshaft * OE steel connecting rods * Hypereutectic pistons * Chromoly piston rings * Hydraulic roller camshaft * Magnum cylinder heads * Steel rocker arms * Timing set * Oil pan, oil pump and pick-up tube * Valve covers * Flexplate * Performance intake manifold * Distributor * Stock water pump * Front damper * FiTech Go Street EFI 400 hp * Spark plugs and wires * Dyno test/tune

5.0 out of 5 stars ( 2 )

$5,898.99

ATK High Performance Ford Truck 302 Drop-In Long Block Crate Engines

ATK High Performance Ford Truck 302 drop-in long block crate engines are fully dressed with moderate horsepower and torque based off the 64-86 Ford 302 engine. These Stage 3 engines typically make about 230 hp on the dynamometer. Engine specifications: * Block: seasoned OE non-roller block * Bore/Stroke: up to 4.060 in. x 3.000 in. * Displacement: 302 c.i.d. * Crankshaft: OE one-piece seal, external balance 50 oz. * OE powder metal connecting rods * Pistons: cast aluminum * Piston rings: chromoly * Compression Ratio: 8.6:1 * Camshaft: hydraulic flat tappet * Camshaft specifications: 192/183 at 50, .380/.395 111LSA * Double roller timing chain * Cylinder heads: OE cast iron * Stamped steel 1.6 pedestal mount rocker arms * Oil pan: rear sump truck

Not Yet Reviewed

$3,998.99

ATK High Performance GM 383 Stage 1 Marine Long Block Crate Engines

Replace the tired small block in your boat with ATK High Performance GM 383 Stage 1 marine long block crate engines. They are built from the ground up with off-shore performance in mind. These hand-built and balanced engines utilize Vortec power and stroker torque to produce an awesome 345 hp and 445 ft.-lbs. of twist that will get you moving on the open water. Each engine features brass freeze plugs and corrosion-resistant marine gaskets to keep the engines healthy and reliable. ATK GM 383 Stage 1 Marine long block crate engines include: * Handpicked, remanufactured blocks * Dart Iron Vortec cylinder heads * Nodular steel crankshaft and 4340 I-beam connecting rods * Hypereutectic pistons * Hydraulic roller camshaft * Valve covers * Timing cover and timing set * Oil pan, pump, and pickup tube

5.0 out of 5 stars ( 5 )

$4,417.99

ATK High Performance Chevy LM7 383 Short Blocks

ATK Chevy LM7 383 short blocks support your build with a solid foundation. Produced for the 1999-2007 trucks, LM7 engines are very popular engines to swap into musclecars and other LS swap vehicles. ATK High Performance Chevy LM7 383 short blocks are built for naturally aspirated engines up to 700 hp. Your ATK LM7 engine may include these components for optimal performance: * Block: GM LM7 5.3L * Bore/stroke: 3.903 x 4.000 * Displacement: 383 cu. in. * Crankshaft: K1 4340 forged steel, internally balanced 24-tooth * Connecting rods: Scat Premium Pro 4340 forged I-beam with ARP 8740 bolts * Pistons: Wiseco 2618 forged aluminum with coated skirts * Piston rings: Wiseco GFX (alloy steel top ring) * Camshaft bearings: Installed and clocked to OEM position * Freeze plugs: Brass installed and sealed * Oil galley plugs: installed and sealed * Weight: 285 lbs.

Not Yet Reviewed

$4,098.99

ATK High Performance LS3/L92 255cc Aluminum Cylinder Heads

ATK high performance LS3/L92 25cc as cast aluminum cylinder heads are the perfect budget option for your next LS build. These fully assembled heads are capable of making over 600 hp naturally aspirated out of the box and will come loaded with upgraded components. The springs are set up to be used on up to .650 in. lift camshafts. No reason to swap parts on your new heads when running an upgraded cam! -- Features and benefits: * Bronze valve guides * Dual valve springs for .650 in. max lift * CNC-finished faces and bolt holes for extreme accuracy * 355-T6 high density aluminum * Machined for screw in studs and guide plates * All factory components will fit without modification -- Cylinder Head Specifications INTAKE: * Intake Runner Volume (cc): 252 * Intake Port Location: Standard * Intake Valves Included: Yes * Intake Valve Diameter (in): 2.160 in. EXHAUST: * Runner Volume (cc): 78.8 * Exhaust Valve Diameter (in): 1.600 in. * Exhaust Valves Included: Yes * Exhaust Runner: No * Port Shape: Round * Exhaust Port Location: Standard COMBUSTION CHAMBER: * Combustion Chamber Volume (cc): 69.4 * CNC-Machined Combustion Chamber: No VALVE SPECS: * Intake Valve Angle: 12 degrees (3 degrees rolled) * Exhaust Valve Angle: 12 degrees (3 degrees rolled) * Valve Guides Included: Yes * Valve Guide Material: Manganese Bronze * Valve Seats Machined: Yes * Valve Seat Machine Style: 5-Angle * Valve Seat Material: Chrome Nickle * Valve Stem Seals Included: Yes * Valve Stem Seal Style: Viton® Fluoroelastomer SPRINGS: * Valve Springs Included: Yes * Maximum Valve Lift (in): .650 in. * Spring Pressure Open: 370 @ 1.150 * Spring Pressure Closed: 142 @ 1.800 * Outside Diameter of Outer Spring (in): 1.29 in. * Damper Spring Included: Yes * Number of Springs per Valve: Dual * Retainers Included: Yes * Retainer Material: Chromoly Steel * Locks Included: Yes * Lock Style: 7 Degree ROCKER ARMS: * Rocker Arm Studs Included: No * Rocker Arms Included: N/A * Rocker Arm Nut Thread Size (in): 8 x 1.25 * Rocker Arm Nuts Included: No MISC: * Head Style: Assembled * Cylinder Head Material: Aluminum * Cylinder Head Finish: Natural * Spark Plug Style: Standard * Cover Mounting Style: Standard * Steam Holes Drilled: No * Oiling Style: Through Pushrod * Machined for O-Ring: No * Heat Crossover: No * 10mm Accessory Bolt Holes Machined On Ends of Heads

Not Yet Reviewed

$748.99

ATK High Performance Chevy LM7 5.3L Short Blocks

ATK High Performance Chevy LM7 5.3L short blocks are assembled with OE flat top pistons and offer these engine specifications: * Seasoned 5.3L LM7 block * 1999-2007 year range * Bore/stroke: 3.810 in. x 3.622 in. * Displacement: 330 cu.in * OEM GM 24-tooth reluctor wheel crankshaft * OEM GM forged powder metal rods * Stock hypereutectic flat top pistons with two valve reliefs * Compression ratios: 61cc = 9.8:1/64cc = 9.5:1/68cc = 9.1:1 -- Can vary due to deck height/gasket thickness * Plasma moly rings * Camshaft bearings: Installed and clocked to OEM position * Freeze plugs: Installed and sealed * Oil galley plugs: Installed and sealed

Not Yet Reviewed

$2,043.99

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