ATK High Performance Chevy LM7 383 Short Blocks SP77

$2,386.00

Chevy LM7 383CI Short Block +8cc Dished Pistons 24 Tooth

Overview

Name: ATK High Performance Chevy LM7 383 Short Blocks SP77 - X Factors Motorsports
Price: 2386.00 USD
Availability: InStock

Brand: ATK High Performance Engines

Manufacturer’s Part Number: SP77

Part Type: Short Block Engines

Product Line: ATK High Performance Chevy LM7 383 Short Blocks

Summit Racing Part Number: HPE-SP77

UPC: 653517410185

Crate Engine Family: Chevy LS

Actual Engine Displacement: 6.3L/383

Rear Main Seal Style: 1-piece

Crankshaft Material: Forged 4340 steel

Piston Material: Forged aluminum

Short Block Piston Style: Dish

Connecting Rod Material: Forged 4340 steel

Connecting Rod Beam Style: I-beam

Engine Block Material: Cast iron

Main Bolt Style: 6-bolt

Main Journal Type: Chevy LS

Engine Balance: Internal

Oil Pan Included: No

Timing Cover Included: No

Harmonic Balancer Included: No

Flexplate Included: No

Flywheel Included: No

Assembled: Yes

Remanufactured: No

Quantity: Sold individually.

Notes: 24X reluctor wheel. 8cc piston volume.

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.

Applications

Make: CHEVROLET

Engine Type: V8

Engine Size: 6.3L/383

Engine Family: Chevy small block Gen III/IV (LS-based engines)

Effective Date: August 9, 2025

At X Factors Motorsports, we are committed to delivering your order quickly, securely, and affordably.

1. Processing Time

Orders are typically processed within 1–2 business days after payment is confirmed.
Orders placed on weekends or holidays will be processed on the next business day.

2. Delivery Times

Domestic Shipping (United States): Delivery takes 5–7 business days from the date of shipment.
International Shipping: Delivery times vary by destination and may take 7–21 business days depending on customs processing and local delivery services.

3. Shipping Rates

United States: Free standard shipping on all orders.
International: Shipping costs are calculated at checkout based on the delivery address, package weight, and destination country.

4. Carriers Used

We ship orders using trusted carriers such as UPS, FedEx, USPS, and DHL to ensure reliable delivery. Tracking numbers are provided for all shipments.

ATK High Performance Chevy LM7 383 Short Blocks SP77

Overview

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ATK High Performance Chevy LM7 383 Short Blocks SP77

Overview

Applications

1. Processing Time

2. Delivery Times

3. Shipping Rates

4. Carriers Used

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