5.3L LS – LM7 AKA Vortec 5300
The Vortec 5300 LM7 (VIN code 8th digit “T”) was introduced in 1999. It has a cast-iron block and aluminum heads and can be considered the “garden variety” version of the Generation III V-8s.
| 325 Cubic Inches | 3.780″ Bore | Iron Block |
| 270-290 HP | 3.622″ Stroke | 6 Bolt Main Cap |
| 315-335 ft-lbs Torque | 24X Reluctor | 9.5:1 Compression Ratio |
| 2002–2005 | Cadillac Escalade 2WD |
| 2002–2006 | Chevrolet Avalanche |
| 2003–2007 | Chevrolet Express/GMC Savana |
| 1999–2007 | Chevrolet Silverado 1500 |
| 1999–2007 | GMC Sierra 1500 |
| 2000–2006 | Chevrolet Suburban/GMC Yukon XL 1500 |
| 2000–2006 | Chevrolet Tahoe/GMC Yukon |
706 Heads
These cathedral offerings come stock with great flow and, unlike many truck heads, smaller factory combustion chambers (61.15cc) that won’t drop your compression into the basement. These heads came on hundreds of thousands of 1999 and up GM 5.3L and 4.8L engines, so they are super plentiful in scrapyards.
| Intake Vlave Size | 1.89 | Intake Port Volume | 197 cc |
| Exhaust Valve Size | 1.55 | Exhaust Port Volume | 69 cc |
| Combustion Chamber | 61.5 cc | ||
| Intake Flow (0.500″ Lift) | 220.5 | ||
| Exhaust Flow (0.500″ Lift) | 180.9 | ||
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Quick Refrences
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Torque Specs
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Piston Ring Clocking
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Drive Accessories
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Short Block
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Heads
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Accessories
Modifications, Upgrades & Maintainence
Short Block Assembly
Torque Specs Fastener Type Fist Pass Second Pass Final Pass Main Caps Inner Bolts 15 ft.-lbs. - 80 degrees Outer Studs 51 degrees Side Bolts - 18 ft.-lbs. Connecting Rod Bolts First Design 15 ft.-lbs. - 60 degrees Second Design 85 degrees Oil Pump Bolts - - 18...
ECU/PCM – FitechEFI 70002
The Ultimate LS1/LS2/LS6 500HP Intake Manifold Kit with 92mm throttle body and trans control are a complete self-tuning induction systems for LS engines designed for the do-it-yourself hot rodder to the professional EFI tuner! This system is ready to go with everything needed to complete the induction system of your LS engine and get you on the road easily and faster than any system on the market today. Forget sourcing mismatched parts and cutting and splicing old harnesses and re-flashed ECU’s from “Craigs List” tuners. FiTech’s Ultimate EFI is a complete Kit. Suitable for that junkyard 5.3 to a stroker 427, we have you covered! Check out the list of features and you will wonder why it’s never been so simple to ditch that old factory hardware or top off that fresh long block. We have taken the work out of getting your new or pull-out LS up and running in a flash. That’s why we call this intake manifold kit the Ultimate EFI.
This intake manifold Kit comes with electronic transmission control. This option is used when operating a GM electronically controlled automatic transmission. The Ultimate LS ECU has the ability to control the shift point, shift firmness, when to downshift properly, and all other features involved when controlling the transmission. This feature is suitable for 4L60, 4L65, 4L80 or 4L85 GM transmissions. If using transmission control connect the two sides of the trans connector to the sub-harness and connect this to the connector on the transmission. Once connected to the transmission you are ready. If not using transmission control leave the connectors untouched.
Valve Train
Comp Cam – 54-454-11 Grind # 277LRR HR-13
These COMP Cams LSR Series hydraulic roller camshafts feature modern lobe profiles that take full advantage of high-flowing late model GM LS3 rectangular port cylinder heads. They are tailored for a specific rpm range and usage, from torque to high-rpm horsepower. Give your Chevy LS3 engine a shot in the arm with one of these COMP Cams LSR Series hydraulic roller camshafts.
Brian Tooley high lift springs – SK001
The BTR platinum spring kit would be inducted into the LS aftermarket hall of fame if such a thing existed. Whether you’re putting together a daily driver with a mild cam, a 600 hp N/A stroker, or a turbocharged 1000 hp brawler, our platinum spring kit will make sure your valves are right where your cam wants them to be at all times. They are designed to be used with stock rocker arms. If you go the roller rocker route, see part # SK002. This is a drop-in kit for 15° LS heads. It will also work with LS7 heads when used with a .045” shim (Part numbers SS015 +SS030). This kit will not fit LS9 engines. See part # SK006 for LS9 heads.
Brian Tooley trunnion upgrade – TK001
BTR’s TK001 rocker trunnion kit is an excellent upgrade for your stock LS rocker arms. The TK001 utilizes high quality components to improve reliability and performance in your application by eliminating failure prone, limited travel factory bearings. Available with or without our 8mm, 12 point socket.
