Inline Performance
InlinePRO K-Series Cylinder Head packages (core required)
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Fitment help
Description
Stage 0 - K20/K24: inspect, disassemble, hot tank, soda blast, performance valve job, grind valves, install bronze exhaust guides, guide seals, resurface deck, blueprint, and assembly.
Stage 1 - K20/K24: inspect, disassemble, hot tank, performance valve job, grind valves, install bronze exhaust guides, guide seals, resurface deck, blueprint, inlinePRO dual valvesprings/dual spring bases/titanium retainers, and assembly.
Stage 2 -K20/K24: inspect, disassemble, hot tank, soda blast, performance valve job, grind valves, install bronze exhaust guides, guide seals, resurface deck, blueprint, inlinePRO dual valvesprings/dual spring bases/titanium retainers, Stainless Steel valve set all motor/turbo low boost and assembly.
Stage 2.5 - K20/K24: inspect, disassemble, hot tank, soda blast, performance valve job, grind valves, install bronze exhaust guides, guide seals, resurface deck, blueprint, inlinePRO dual valvesprings/dual spring bases/titanium retainers, high HP Stainless Steel intake valve/Inconel exhaust valve, and assembly.
Stage 2.5x - K20/K24: cylinder heads: inspect, disassemble, hot tank, performance valve job, grind valves, install bronze 6.6mm exhaust guides, guide seals, resurface deck, blueprint, inlinePRO dual valvesprings/dual spring bases/titanium retainers, Hardened Locks, 5.5mm HeavyDuty Intake Valve/Inconel 6.6mm exhaust valve, and assembly.
Stage 3 - K20/K24: cylinder heads: inspect, disassemble, hot tank, performance valve job, port&polish, grind valves, install bronze 6.6mm exhaust guides, guide seals, resurface deck, blueprint, inlinePRO dual valvesprings/dual spring bases/titanium retainers, Hardened Locks, 5.5mm HeavyDuty Intake Valve/Inconel 6.6mm exhaust valve, and assembly.
Stage 4 -K20/K24: inspect, disassemble, hot tank, soda blast, performance valve job, port&polish, grind valves, install bronze intake/exhaust guides, guide seals, resurface deck, blueprint, inlinePRO dual valvesprings/dual spring bases/titanium retainers, high HP Stainless Steel over size intake valve/Inconel oversize exhaust valve, oversize intake seat w/installation, and assembly.
Specifications
| Core | Required — built on your core |
|---|---|
| Lead time | Built to order — typically 2–4 weeks |
| Category | Cylinder Head Packages |
| Brand | Inline Performance |
Fitment
This part is listed for the engine families below. If your build is unusual — a swap, a stroker, an aftermarket head — send us the combination and we will confirm fitment before you order.
Shipping & Returns
Orders ship within the United States from our shop in Springfield, Virginia. Weight-based rates are calculated at checkout.
Shipping outside the US? We do not take international orders through the website — call 703-455-5805 or email info@inlinepro.com and we will arrange the order and payment with you directly.
Returns must be approved before shipping, made within 30 days in original condition, and are subject to a 25% restocking fee. No returns on used parts, electronics or special orders.