Description
Product Overview
This iFJF 16-piece LS7-style hydraulic roller lifter set is a direct replacement for GM Gen III/IV LS-based V8 engines. Precision CNC-machined from high-grade alloy steel with hardened roller tips, these lifters are engineered to handle the demands of high-RPM operation, aggressive camshaft profiles, and sustained heavy loads. Replaces GM OEM part numbers 17122490, 12499225, and the popular HL124 aftermarket designation. Covers all LS engine variants from 4.8L to 6.2L.
Key Features
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Complete 16-Piece Set — Includes all 16 lifters needed for a full V8 engine. No need to buy two 8-piece sets or risk mismatched lifters.
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LS7-Style Heavy Duty Design — Based on the factory LS7 lifter specification with improved internal valving for consistent bleed-down rates at high RPM.
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Precision CNC Machining — Tight manufacturing tolerances ensure consistent lifter preload across all 16 positions, reducing valvetrain noise and wear.
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Hardened Roller Tips — Heat-treated roller wheels resist wear and pitting even with aggressive aftermarket camshaft lobes.
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Universal LS Fitment — Compatible with all Gen III and Gen IV LS engines: 4.8L (LR4, LY2), 5.3L (LM7, L59, LMG, LC9, LH6), 5.7L (LS1), 6.0L (LS2, LQ4, LQ9, L76, LY6), and 6.2L (LS3, L92, L9H).
Compatibility
| Engine |
Displacement |
RPO Codes |
Common Vehicles |
| 4.8L V8 |
4800cc |
LR4, LY2 |
Silverado 1500, Sierra 1500, Express, Savana |
| 5.3L V8 |
5300cc |
LM7, L59, LMG, LC9, LH6, LS4 |
Silverado, Tahoe, Suburban, Avalanche, Yukon, TrailBlazer |
| 5.7L V8 |
5700cc |
LS1 |
Camaro, Firebird, Corvette C5, GTO |
| 6.0L V8 |
6000cc |
LS2, LQ4, LQ9, L76, LY6 |
Corvette C6, GTO, TrailBlazer SS, Silverado SS, Escalade |
| 6.2L V8 |
6200cc |
LS3, L92, L9H, L94 |
Corvette C6, Camaro SS, Escalade, Denali |
| 7.0L V8 |
7000cc |
LS7 |
Corvette Z06, Camaro Z/28 |
Specifications
| Parameter |
Value |
| OEM Part Numbers |
17122490, 12499225, HL124 |
| Lifter Type |
Hydraulic Roller |
| Quantity |
16 Lifters (Complete V8 Set) |
| Lifter Body Diameter |
0.842" (Standard LS Bore) |
| Roller Wheel Diameter |
0.700" |
| Travel/Plunger Range |
0.060" |
| Material |
Alloy Steel Body, Hardened Roller Tip |
When to Replace LS Lifters
LS lifters are a known weak point, especially on higher-mileage engines and those with aftermarket camshafts. Common symptoms of failing lifters include: ticking noise from the valvetrain that doesn't go away when warm, misfire codes (P0300), collapsed lifter causing dead cylinder, and metal debris in oil. If you're doing a cam swap, replacing lifters is mandatory — never reuse old lifters on a new camshaft. This 16-piece set provides a cost-effective alternative to OEM GM lifters without compromising quality.
Installation Tips
- ALWAYS replace lifters when installing a new camshaft — used lifters will destroy a new cam lobe
- Soak lifters in engine oil for 30 minutes before installation to pre-fill
- Apply assembly lube to roller tips and lifter bodies before inserting into lifter bores
- Use new lifter trays (guides) — old plastic trays become brittle and can crack
- Check lifter preload after installation with adjustable pushrods or proper-length stock pushrods
- Prime the oil system before first start to ensure lifters are full of oil
- Break in with high-zinc oil (ZDDP) for the first 500 miles if also replacing the camshaft
Frequently Asked Questions
Q: Will these fit my 2007 Silverado 5.3L (LMG)?
A: Yes. These lifters are a direct replacement for all Gen IV 5.3L engines including LMG, LC9, LH6, and LY5 variants found in 2007-2013 Silverado/Sierra 1500.
Q: Do I need to replace the lifter trays too?
A: Strongly recommended. The factory plastic lifter trays (GM part 12595365) become brittle over time from heat cycling. New trays are inexpensive insurance against lifter rotation and catastrophic failure.
Q: Can I use these with a performance camshaft?
A: Yes. These LS7-style lifters are rated for higher RPM operation than standard LS1 lifters. They work well with mild to moderate aftermarket camshafts (up to .600" lift, up to 6,500 RPM). For more aggressive setups, consider link-bar lifters.
Q: Do I need to remove the cylinder heads to replace lifters?
A: Yes. LS lifters are located under the cylinder heads. Head removal is required. Replace head gaskets and head bolts (LS engines use torque-to-yield bolts) at the same time.
Q: What's included in the 16-pack?
A: 16 hydraulic roller lifters. Lifter trays/guides, pushrods, head gaskets, and head bolts are sold separately.
Q: Are these the same as OEM LS7 lifters?
A: These are manufactured to LS7 specifications with equivalent internal valving and hardening. They provide comparable performance and durability at a significantly lower price point than OEM GM lifters.
