Search covers every category plus alternate names and common job terms.
VALVETRAIN & COVERS
Rockers, lifters and covers
Rocker arm bolts
Base circleTorque each rocker only after confirming its lifter is on the camshaft base circle.
Source: L83/L86 fastener specification ↗Valve cover bolts
In sequenceTighten in the specified rocker-cover sequence.
Source: L83/L86 fastener specification ↗Valley cover bolts
OEM hardwareVerify aftermarket AFM-delete cover instructions when a replacement cover is used.
Source: L83/L86 fastener specification ↗Valve lifter guide bolts
4 fastenersConfirm each guide is fully seated over its lifters before tightening.
Source: L83/L86 fastener specification ↗Valve lifter oil manifold bolts
OEM hardwareFactory oil-manifold hardware only.
Source: L83/L86 fastener specification ↗Valve lifter oil manifold filter plug
OEM hardwareFactory filter-plug specification.
Source: L83/L86 fastener specification ↗CAMSHAFT & TIMING
Camshaft and timing hardware
Camshaft retainer plate bolts
TORX-head boltsSeat the retainer plate evenly; verify any threadlocker requirement for the fastener being used.
Source: L83/L86 fastener specification ↗Camshaft actuator / phaser bolt - Gen V
TTY · Replace2014-2018 L83/L86 and early LT1/LT4. Do not reuse or substitute the later Gen V+ bolt.
Source: Current GM replacement application ↗Camshaft actuator / phaser bolt - Gen V+
Different boltLater L82/L84/L87/L8T/LT2 applications use a different bolt. It is shown only to prevent a parts-counter mix-up.
Source: Current GM replacement application ↗Camshaft actuator magnet bolts
OEM hardwareThe small fasteners retaining the actuator magnet to the front cover.
Source: L83/L86 fastener specification ↗Timing chain tensioner bolts
OEM hardwareConfirm the tensioner is seated and released correctly before rotating the engine.
Source: L83/L86 fastener specification ↗Camshaft position sensor bolt
OEM hardwareCamshaft position sensor retaining bolt.
Source: L83/L86 fastener specification ↗Camshaft sensor harness bolt
OEM hardwareHarness retaining bolt, not the sensor itself.
Source: L83/L86 fastener specification ↗HEADS & ROTATING ASSEMBLY
Cylinder heads and bottom end
Cylinder head bolts - standard bolts
TTY · Replace19 required per engine. Tighten in sequence; the forward internal-hex bolt on the left head has a different final angle.
Source: GM Genuine Parts ↗Cylinder head bolt - forward LH internal hex
TTY · ReplaceOne required per engine: forwardmost fastener on the driver-side cylinder head.
Source: GM Genuine Parts ↗ARP head studs
Aftermarket hardwareDo not use the OEM head-bolt procedure. Torque depends on the exact ARP kit, lubricant and instructions supplied with it.
Connecting rod bolts
TTY · ReplaceFactory connecting-rod fasteners only.
Source: L83/L86 fastener specification ↗Main cap inner bolts
TTY · In sequenceComplete the inner and outer fasteners in sequence before the side bolts.
Source: L83/L86 fastener specification ↗Main cap outer bolts
TTY · In sequenceComplete in the specified main-cap sequence.
Source: L83/L86 fastener specification ↗Main cap side bolts
TTY · Last passTighten only after the inner and outer main-cap fasteners are complete.
Source: L83/L86 fastener specification ↗Crankshaft oil deflector bolts
OEM hardwareFactory windage/oil-deflector hardware.
Source: L83/L86 fastener specification ↗COVERS & OIL SYSTEM
Front cover, rear housing and oil pan
Oil pump-to-block bolts
Alignment requiredCenter the pump with the correct alignment method before final torque.
Source: L83/L86 fastener specification ↗Front cover bolts
OEM hardwarePosition the cover correctly before final torque.
Source: L83/L86 fastener specification ↗Rear oil-seal housing bolts
OEM hardwareCrankshaft rear oil-seal housing to block.
Source: L83/L86 fastener specification ↗Oil pan-to-block and front-cover bolts
Inside-out sequenceTighten the main upper-pan fasteners working from the inside outward.
Source: L83/L86 fastener specification ↗Oil pan-to-rear-housing bolts
OEM hardwareRear cross bolts; do not confuse inch-pounds with foot-pounds.
Source: L83/L86 fastener specification ↗Lower-to-upper oil pan bolts
OEM hardwareLower pan perimeter fasteners.
Source: L83/L86 fastener specification ↗Oil pan cover bolts
OEM hardwareFactory oil-pan service cover fasteners.
Source: L83/L86 fastener specification ↗WHY THIS REFERENCE
More than a copied torque table.
- Exact applicationL83/L86 values stay separate from later Gen V+ hardware.
- Fastener intelligenceTTY status, reuse warnings and confirmed GM part numbers.
- Job contextBase circle, fuel-pump lash, timing and sequence links where the number alone is not enough.
- Traceable sourcesEvery released value keeps its source and revision visible.
THE WHOLE REFERENCE STAYS FREE
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- Torque specifications and tightening sequences
- Pushrod length and preload calculator
- Timing, fuel-pump and base-circle procedures
- Tools and exact replacement-fastener references
Primary application baseline: L83/L86 fastener specification. Cross-checked against Summit Racing, Michigan Motorsports, ICT Billet and application-specific installation material. Conflicts stay unpublished until resolved.