Callies 8 Counterweight Crankshaft - Compstar - 4.000" Stroke - 58X Reluctor - APO-31Q-CS / APO-31Q-CS58
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Compatibility
- Vehicle-specific fitment
- Review application details below
- Need help?
- Confirm fitment with us before ordering — (714) 202-7886
We list the engine platform a part is built for. That is not year-and-trim application data, so it does not confirm a fit on your specific vehicle.
- Install quoted on request. We fit parts in-house in Huntington Beach, but we do not publish a labor figure for this item — we would rather quote your car than guess. Call (714) 202-7886 or pick Install at HRC and add your vehicle details, and we will come back with the labor.
- Warranty & track disclaimer — read before you race it.
- Shipping & returns — rates and RMA terms.
- Installed in-house in Huntington Beach, CA — labor & service policy.
- Affirm and PayPal available at checkout.
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Callies 8 Counterweight Crankshaft - Compstar - 4.000" Stroke - 58X Reluctor - APO-31Q-CS. Supplied through Brian Tooley Racing.
Callies Compstar 4340 forged LS crankshaft: 4.000" stroke, internal balance, 8 counterweights, standard snout, 6-bolt flange, 58-tooth GM reluctor, 1-piece rear main seal. Callies part number APO-31Q-CS58 (Summit/Atech CPI-APO31Q-CS58).
Specifications: Stroke 4.000 in. | Main journal 2.559 in. | Rod journal 2.100 in. (requires narrow bearings) | Material forged 4340 steel, deep nitrided | Internal balance, lightened rod journals | Rod length 6.125 in. | Balancer bolt M16 x 2.0 | Weight approx. 50 lb | Sold individually, bearings not included.
Compstar crankshafts are rough machined from certified 4340 forgings, double stress relieved, finish machined and inspected by Callies, and hardened with a deep nitride for abusive racing environments. Counterweights are profiled for piston clearance and all rod journals are drilled.
| Part No. | CAL-APO-31Q-CS |
|---|---|
| Brand | Callies Performance |
Platform-level fitment (Ford + GM, Phase 1). We publish the engine platform a part is built for — not year-and-trim application data — so nothing here confirms a fit on a specific vehicle. Confirm fitment with us before ordering: (714) 202-7886.
Commonly Needed With This
Parts builders usually buy alongside this one — gaskets, seals and hardware for the install. These are suggestions, not a verified fit: call (714) 202-7886 to confirm before ordering.
