Unlock your engine's full potential with Taylor Automotive's CNC precision line boring

By combining cutting-edge CNC technology with advanced machining expertise, we deliver tailored solutions that rectify misaligned or worn main tunnels, ensuring precise tolerances and alignment that meet or exceed factory specifications. Whether you're rebuilding a damaged engine or upgrading to high-performance aftermarket components, our precision line boring services guarantee exceptional results.

Contact us today to explore how our precision machining services can elevate your engine's performance.

The CNC precision line boring process

\When main tunnels require correction, line boring is the most accurate and effective solution. Our engine block boring machine allows us to achieve precise results, ensuring every detail is aligned to exact specifications. The process involves:

Machining the parting faces of the main caps to reduce the tunnel size.
Using CNC-guided tools to bore the tunnels to the correct size and alignment.

Line boring is particularly essential when fitting aftermarket main caps, such as steel 4-bolt main caps for V8 engines. This process ensures that the new caps are perfectly aligned with the block, providing long-term reliability and stability for your engine.

Line honing: An alternative solution

In some cases, line honing can also be used to correct main tunnel discrepancies. This method involves machining the parting faces of the main caps to reduce the tunnel size, followed by honing the tunnels with a precision mandrel to achieve the correct dimensions. While line honing is effective for minor adjustments, line boring provides a higher level of accuracy and is the preferred choice for aftermarket modifications or engines with significant misalignment.

The importance of line boring

The main tunnels in an engine block play a critical role in supporting the crankshaft and maintaining alignment within the engine. Over time, these tunnels can lose their shape and alignment due to wear, stress, or engine failure. Misaligned or oversized main tunnels can cause excessive wear, reduce efficiency, and lead to costly damage.

At Taylor Automotive, we begin every job with a thorough inspection of the main tunnels, comparing their size and tolerances against the original manufacturer’s specifications. This allows us to identify any discrepancies and determine the most effective solution to restore alignment and functionality.

Lifter bore machining and sleeving

In addition to line boring, we also offer lifter bore machining and sleeving to address worn or damaged lifter bores. This service is particularly beneficial for engines that require larger diameter lifters or those needing restoration to factory dimensions.

For performance applications, we can machine lifter bores to fit oversized lifters, enhancing stability and valve train performance.
Alternatively, we can machine the bores to accommodate durable bronze sleeves, allowing the original lifters to be reused while improving stability and durability.

Our CNC-guided blueprint machining technology ensures precise alignment and correction of any factory misalignment issues, making this an ideal solution for performance and V8 engines.

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Engine Reconditioners / Vehicle Servicing / WOF