Service
Line Honing
Restore main bore alignment so the crankshaft runs true. Inspected, corrected, honed, and verified in-house.
Overview
What this service delivers
Line honing at Paul Ferreira Racing Engines restores the main bearing bore to correct size and alignment so the crankshaft sits on a true centerline. Paul inspects the mains with caps torqued, corrects caps as needed, precision-hones the bore, and verifies bearing alignment before the block moves on. The goal is even bearing load and consistent oil clearance — not a bore that is merely “close enough.”
Key Facts
- Main bore alignment measured with caps torqued
- Cap correction included when required
- Precision line honing to size and centerline
- Bearing alignment verified after honing
- Final bore dimensions documented
- Performed entirely in-house
Scope of Work
What's Included
Main Bore Inspection
Main bore alignment and diameter are measured with the caps installed and torqued. Distortion and misalignment are quantified before any metal is removed.
Cap Correction
Main caps are corrected as required so the hone restores a true, round bearing bore — not a compromise around warped or mismatched caps.
Precision Honing
Line honing brings the main bore back to size and alignment so the crankshaft sits true through every journal.
Bearing Alignment
The finished bore is verified for alignment so bearing shells seat evenly and oil clearances remain consistent across all mains.
Final Verification
Bore size and alignment are re-checked after honing. The block does not leave the machine until the numbers confirm a true centerline.
Why It Matters
Crankshaft life depends on main bore alignment
The crankshaft is only as stable as the main bore it rides in. If that bore is out of alignment — from stress, previous machining, or cap distortion — bearings wear unevenly, oil clearances open up in the wrong places, and failures show up as spun bearings or unexplained vibration.
Line honing corrects the geometry of the main bore so every journal shares load the way the engine was designed to. That starts with measuring the bore as it will be assembled: caps installed and torqued. Numbers taken any other way do not reflect how the engine runs.
Paul pairs cap correction with honing because a true bore requires both. Skipping either step leaves a compromise that racing loads will find. Final verification confirms size and alignment before the block is released for assembly.
When the rotating assembly goes in, it sits where it should — centered, supported, and ready for the clearances Paul sets at build time.
Builders send blocks to Fort Myers for line honing when they need a verified centerline — not a quick size pass that leaves alignment to chance.
The Process
Paul's Process
- 01
Inspect
Main bores measured with caps torqued in place.
- 02
Correct Caps
Cap faces and bores corrected as required.
- 03
Line Hone
Precision honing restores size and alignment.
- 04
Align Check
Bearing bore alignment verified across all mains.
- 05
Verify
Final diameters and centerline documented.
The Standard
Why Paul Ferreira
Alignment Is Not Optional
A crankshaft that is forced into a misaligned main bore will wear bearings unevenly and can destroy an otherwise good rotating assembly. Paul line-hones to restore a true centerline, not to chase a quick size correction.
Caps Done Right
Line honing without addressing cap condition is incomplete work. Cap correction is part of the process so the hone has a square, consistent bore to finish.
In-House Control
Inspection, correction, honing, and verification happen under one roof. Paul knows what the block measured before and what it measures after — no secondhand data.
Built for Load
Racing loads amplify small alignment errors. The standard here is an alignment that holds under those loads, not one that only looks acceptable on a soft teardown.
Need main bore alignment restored?
Bring the block in. Paul will measure the mains, correct what needs correcting, and line-hone to a verified centerline.