Best Engine Plugs on Block for Non-Afm GM LSX LT Engines
Choosing the right oil valley plugs for non-AFM GM engines helps prevent oil pressure leaks and ensures reliable engine performance. This guide reviews five top options, focusing on compatibility with LSX and LT series engines (4.8L, 5.3L, 6.0L, 6.2L) from 2008–2023, and explains what to look for when selecting blocks-off plugs for non-DOD setups.
Summary of selected products
| Product | Brand | Engine Compatibility | Material & Features |
|---|---|---|---|
| OywhC Engine Plugs Fit for Non-AFM GM Engines 2008-2023 | OywhC | LSX and LT Series (4.8L, 5.3L, 6.0L, 6.2L) | Stainless steel; blocks oil flow for non-DOD; corrosion resistant |
| Oil Block Off Plugs for Non-AFM GM Engine (8-Pack) | GJYSYP | LSX/LT Series; 4.8L, 5.3L, 6.0L, 6.2L | Stainless steel; precision-machined; anti-corrosion |
| Rustak 16 Pcs Brass Pipe Plugs Set | Rustark | General engine/ports; suitable for blocks and oil ports | Brass; multiple sizes; hex head for quick install/removal |
| 8 PCS Engines Plugs Non-DOD For 2008-2023 GM Engines | WUMZIJ | Non-AFM GM engines; LSX LT models | Stainless steel; durable; blocks oil flow |
| Michigan Motorsports LS Engine Block Plug Kit | Michigan Motorsports | LS1, LS2, LS3, LQ4, LM7, L99, LR4 (4.8–6.2L) | Barbell oil galley plug; complete set; dual-seal design |
OywhC Engine Plugs Fit for Non-AFM GM Engines
These Oil Valley Block Off Plugs are designed for non-DOD/AFM GM engines from 2008 to 2023, including LSX and LT series such as LS1, LS2, LS3, LS7, L83, LT1, LT4, and LT5. The stainless steel construction provides durability and corrosion resistance, ensuring long-term reliability in demanding engine environments. By blocking the oil flow in non-AFM configurations, these plugs help prevent oil pressure leaks and maintain stable engine oil pressure. The kit’s fitment emphasizes flush mounting and straightforward service for easy maintenance.
Oil Block Off Plugs for Non-AFM GM Engine (8-Pack)
This eight-pack covers LSX and LT series engines (LS1, LS2, LS3, LS7, LT1, LT4, LT5) with displacements of 4.8L, 5.3L, 6.0L, and 6.2L. High-precision stainless steel machining, corrosion-resistant surface treatment, and a design that ensures secure sealing of the engine oil circuit make these plugs suitable for eliminating AFM oil-port issues while preserving oil pressure stability. The flush bottom-edge mounting and removable top threads facilitate installation and future removal when needed.
Rustak Brass Pipe Plugs Assortment Set
This 16-piece brass assortment includes 1/8″, 1/4″, 3/8″, and 1/2″ NPT plugs with hex counters for easy installation. Made from brass with strong corrosion resistance and a wide temperature range, these plugs are designed for sealing various engine ports, water pump housings, or oil sender holes. Their hex-head design enables quick installation and removal, supporting versatile use in engine bays and hydraulic ports.
8 Pieces Non-DOD Engine Plugs For 2008-2023 GM Engines
Designed for non-AFM GM engines and LSX LT models, these stainless steel plugs block off oil flow to prevent pressure leaks and improve engine stability. The construction emphasizes durability and corrosion resistance, ensuring long service life under demanding conditions. They fit 4.8L, 5.3L, 6.0L, and 6.2L configurations from 2008–2023, aligning with non-DOD engine setups.
Michigan Motorsports LS Engine Block Plug Kit
This kit covers a wide range of LS blocks (LS1, LS2, LS3, LQ4, LM7, L99, LR4) from 4.8L to 6.2L. It includes four threaded block plugs, a front galley press plug, and a rear barbell plug for comprehensive sealing. The barbell oil galley design supports oil flow in desired areas while ensuring a dual-seal configuration to prevent leaks and maintain oil pressure reliability during engine operation.
Buying Guide: Key Considerations For Choosing Engine Plugs
- Engine compatibility: Confirm the plug kit supports LSX and LT engines with 4.8–6.2L displacements and non-AFM (non-DOD) configurations. Match the valve cover and valley plate design to ensure proper fitment.
- Material and finish: Stainless steel offers corrosion resistance and strength, while brass plugs provide good sealing in low to moderate temperature ranges. Consider the operating environment and potential chemical exposure.
- Sealing integrity: Look for designs that provide a reliable seal for the oil passages, preventing leaks under boost, high RPMs, or sustained driving conditions.
- Installation features: Some plugs feature flush mounting, removable top threads, or adjustable tops to simplify removal. Hex heads and threaded designs can reduce installation time and improve serviceability.
- Kit completeness: A complete set (multiple sizes or a comprehensive assortment) is beneficial for accommodating different ports and galley configurations in GM engines.
- Durability and testing: Prioritize plugs with rigorous manufacturing processes and third-party validation when available, especially for performance builds or race applications.
- Brand reputation and warranty: Choose reputable brands that offer clear return policies, customer support, and warranty coverage for engine components.
- Installation notes: Some plugs are intended for use with original DOD/AFM valley covers or specific valley plate designs. Verify compatibility with your existing valley cover before purchasing.
When selecting engine plugs, it is important to balance material choice, compatibility with non-AFM engines, and the level of sealing required for your specific build. The listed options provide a range of stainless steel and brass constructions, covering common LSX and LT configurations used in GM powertrains from 2008 through 2023.