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Engines and Components› Cylinder Heads and Components

Precision

Stage 2.5 CNC Porting Service

Name: Stage 2.5 CNC Porting Service
Brand: Precision
SKU: 199-5.32.5

$1,490.00 $1,260.99 Save $229.01

SKU: 199-5.32.5

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Professional / shop required

Overview

The Precision Race Components PRC Stage 2.5 CNC Porting Service is a cylinder head machining service for cathedral port heads. This service includes the use of aftermarket 2.02-inch intake valves and 1.57-inch exhaust valves. The process involves disassembly, deep cleaning, CNC porting, CNC valve job, CNC engraving, CNC milling to customer specifications, reassembly, and pressure testing.

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The Precision Race Components (PRC) Stage 2.5 CNC Porting Service transforms your customer-supplied cathedral port cylinder heads into high-performance components. This comprehensive service focuses on maximizing airflow and performance for 4.8L and 5.3L LS-based engines. The multi-stage CNC machining process encompasses disassembly, deep cleaning, precise CNC porting and valve jobs, CNC engraving of PRC logos, milling to your specific requirements, reassembly, and thorough pressure testing to ensure optimal performance and reliability. Flow data for the Stage 2.5 5.3L configuration shows significant airflow improvements, with figures reaching 147 cfm at 0.200" lift on the intake side and 111 cfm on the exhaust side. At 0.600" lift, intake flow reaches 308 cfm, and exhaust flow is 223 cfm. Valve spring upgrades are available as an optional add-on during the configuration process, with options ranging from .550" lift to .750" lift kits. If you are purchasing valve springs separately, PRC can install them for you upon request. It is crucial to remove all cylinder head accessories, including spark plugs, coolant plugs, and steam port blocks, before shipping your heads to Texas Speed and Performance. The company is not responsible for any lost parts during transit. This service is not legal for sale or use in the state of California.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

Brand	Precision
Part Number	199-5.32.5
Category	Engines and Components

Videos

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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