Chevrolet Performance 350 Flywheel Bolt Torque
Chevrolet Performance 350 Flywheel Bolt Torque with application boundaries, staged installation guidance.
Chevrolet Performance specifies 65–70 lb-ft (88–95 N·m) for the flywheel bolts on its covered 350/290 HP long-block package.
Chevrolet Performance specifies 65–70 lb-ft (88–95 N·m) for the flywheel bolts on its covered 350/290 HP long-block package.
The range is tied to Chevrolet Performance 350/290 HP engine package 19172591 and matching production-style components. A different crankshaft flange, flywheel, bolt kit, rear-main-seal design or racing assembly requires its corresponding documentation.
Verify the correct flywheel balance, tooth count, pilot support and bolt length before assembly. Clean the crank flange and flywheel face, use only the specified thread treatment and tighten progressively in a crossing pattern; bolt torque cannot correct a mismatched balance weight or excessive runout.
Interactive Chevrolet Performance 350/290 HP V8 main service map
Branded downloads includedPNG and PDF exports carry the TorqueSheet logo, torquesheet.com, source-page URL, and republishing attribution request. The PDF source link is clickable.
Use the numbered map as an orientation aid only. The application-specific service diagram controls the actual bolt positions and stages.
Chevy 350 Flywheel Torque Specs
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Flywheel to crankshaft | 65–70 lb-ft | 88–95 N·m; covered Chevrolet Performance package |
| Pressure plate to flywheel | Separate specification | Do not transfer crank-bolt value |
| Balance and rear-main-seal design | Must match | One- and two-piece-seal parts differ |
| Aftermarket fastener kit | Bolt-maker instructions | Lubricant changes clamp load |
Verify the correct flywheel balance, tooth count, pilot support and bolt length before assembly. Clean the crank flange and flywheel face, use only the specified thread treatment and tighten progressively in a crossing pattern; bolt torque cannot correct a mismatched balance weight or excessive runout.
How to use this specification correctly
- 01
Identify the engine code, model year, casting, gasket and exact fastener kit before disassembly.
- 02
Clean and inspect threads, bolt holes and mating faces using the component manufacturer's limits.
- 03
Follow the exact staged pattern with the specified lubricant or sealant; record torque and angle completion.
What the 65–70-lb-ft range covers
The value clamps the manual flywheel directly to the crankshaft on the Chevrolet Performance 350/290 package. Pressure-plate bolts, bellhousing bolts and an automatic flexplate are separate joints and should appear on different rows of the repair worksheet.
Inspect the threaded holes and use the specified production or approved replacement bolts. A performance fastener's lubricant can change friction enough that its manufacturer's torque replaces the factory figure.
Balance and runout matter as much as torque
Match flywheel imbalance and rear-main-seal architecture to the crankshaft before assembly. Clean mating faces, remove burrs and draw the flywheel down in progressive crossing passes so contamination cannot hold it crooked.
Check ring-gear condition and runout when the component instructions require it. Extra torque cannot correct the wrong imbalance, an incorrect pilot bearing or a flywheel that is not seated flat.
Why Chevrolet Performance 350/290 HP V8 identification changes the specification
The range is tied to Chevrolet Performance 350/290 HP engine package 19172591 and matching production-style components. A different crankshaft flange, flywheel, bolt kit, rear-main-seal design or racing assembly requires its corresponding documentation.
Verify the correct flywheel balance, tooth count, pilot support and bolt length before assembly. Clean the crank flange and flywheel face, use only the specified thread treatment and tighten progressively in a crossing pattern; bolt torque cannot correct a mismatched balance weight or excessive runout.
Assembly controls that prevent false torque
- Use the specified thread condition and lubricant.
- Separate main bolts from small or special-position fasteners.
- Use an angle gauge where torque-to-yield stages are specified.
- Stop if a fastener reaches the setting before the joint seats normally.
Chevrolet Chevrolet Performance 350/290 HP V8 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.
Chevrolet Performance 350 Flywheel Bolt Torque FAQs
What is the Chevrolet Performance 350 flywheel torque?+
The covered 350/290 HP package specifies 65–70 lb-ft (88–95 N·m).
Does that range apply to pressure-plate bolts?+
No. Pressure-plate-to-flywheel fasteners use a separate clutch specification.
Can a one-piece-seal flywheel fit every Chevy 350 crank?+
No. Rear-main-seal design, bolt pattern and imbalance must match the crankshaft.
Do aftermarket flywheel bolts use 65–70 lb-ft?+
Follow the bolt maker's torque and specified lubricant for that exact kit.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
1Chevrolet Performance 350/290 HP long-block specificationsPrimary Chevrolet Performance guide listing 65–70 lb-ft for flywheel bolts on the covered 350/290 HP engine.↗