Honda B18C Head Bolt Torque Specs and Sequence
Honda B18C Head Bolt Torque Specs and Sequence with application boundaries, staged tightening guidance, reuse cautions and official service-information lookup.
For the 1998 Acura Integra GS-R B18C1, apply clean engine oil to the bolt threads and under-head surfaces, tighten all head bolts in sequence to 29 N·m (22 lb-ft), then repeat the sequence to a final 85 N·m (63 lb-ft).
For the 1998 Acura Integra GS-R B18C1, apply clean engine oil to the bolt threads and under-head surfaces, tighten all head bolts in sequence to 29 N·m (22 lb-ft), then repeat the sequence to a final 85 N·m (63 lb-ft).
The numerical procedure applies to the documented U.S.-market 1998 B18C1 GS-R factory-bolt application. B18C5 Type R, Japanese-market B18C variants, B16/B18B engines, swaps and aftermarket studs require their exact manual or fastener chart.
Interactive B18C1 Inline-Four center-out sequence aid
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This balanced pattern is an orientation aid; use the exact numbered manufacturer diagram for assembly.
Honda B18c Head Bolt Torque Specs
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Pass 1 | 29 N·m (22 lb-ft) | Clean engine oil on threads and under heads |
| Final pass | 85 N·m (63 lb-ft) | Repeat exact B18C1 sequence |
| B18C5/JDM variants | Verify separately | Do not assume B18C1 equivalence |
| Aftermarket studs | Fastener-maker procedure | Specified lubricant controls |
Use the illustrated center-out Honda sequence for both passes and do not mix cylinder-head values with the separate cam-holder sealing bolts. Inspect the block/head surfaces and preserve each application-specific bracket and bolt position.
Application boundaries for B18C1 Inline-Four
The numerical procedure applies to the documented U.S.-market 1998 B18C1 GS-R factory-bolt application. B18C5 Type R, Japanese-market B18C variants, B16/B18B engines, swaps and aftermarket studs require their exact manual or fastener chart.
Use the illustrated center-out Honda sequence for both passes and do not mix cylinder-head values with the separate cam-holder sealing bolts. Inspect the block/head surfaces and preserve each application-specific bracket and bolt position.
Honda B18C1 Inline-Four specifications can change by model year, engine, platform, wheel, and installed component. Confirm the VIN or engine identity, part numbers, fastener condition, and the current manufacturer instructions before service.
Procedures used with this specification
These steps are the same for every vehicle in this family, so they are documented once rather than repeated on each page. The values above remain specific to this Honda B18C1 Inline-Four.
Honda B18C Head Bolt Torque Specs and Sequence FAQs
What is the head bolt torque on a Honda B18C?+
For the 1998 Acura Integra GS-R B18C1: tighten all head bolts in sequence to 29 N·m (22 lb-ft), then repeat the sequence to a final 85 N·m (63 lb-ft).
Do the B18C head bolts need oil?+
Yes. Apply clean engine oil to the bolt threads and the under-head seating surfaces before tightening — the specified torque assumes that friction condition.
Can B18C head bolts be reused?+
Only when the exact service procedure permits reuse and the bolts pass its inspection limits. Reuse is a decision made against the manual's criteria, not a general assumption.
Do ARP or aftermarket studs use the 85 N·m figure?+
No. Use the stud maker's value, lubricant and sequence for the exact kit — a stud kit changes both the fastener and the friction condition the factory number was written for.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
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