Mazworx VQ37VHR Heads Stage 3 Service
Mazworx VQ37VHR Heads Stage 3 Service
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Shipping & returns
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Shipping details
In-stock orders are processed within 48 hours; transit time is additional.
International orders include export processing and customs clearance. Duties, taxes and brokerage are extra; final freight charges may change after remeasurement.
Read the shipping policyReturns
Need help with a return? Request authorization within 30 days of delivery for eligible unused, uninstalled items. See details for exclusions and applicable fees.
Read the full return policyReturn details & how to start
Request return authorization (RMA) within 30 days of delivery for eligible items. Keep items unused and uninstalled, with original packaging and accessories. Electronics, liquids, special orders and other categories are excluded.
Email sales@frsport.com with RETURN and your order number in the subject to request an RMA. Please wait for return authorization before sending your item back.
Wrong part/size or change of mind: a 20% return processing fee applies, plus applicable shipping costs.
Original shipping is non-refundable. For orders shipped free, the actual outbound shipping cost is deducted from the refund. Return shipping is prepaid by the customer.
After payment capture, cancellations and refunds generally incur a 5% processing fee, except for our error, confirmed defects or confirmed carrier loss. The 5% and 20% fees do not stack; only the greater applicable fee applies. Store credit waives the 5% fee, but applicable return fees remain.
Missing, incorrect or transit-damaged items: report within 3 business days of receipt with photos of the product and packaging.
For defective items, contact us for help with the manufacturer's warranty process. The manufacturer decides the claim.
Specifications
Product details shared across all variants.
- Category
- Car Repair & Maintenance
- Shipping dimensions (L × W × H)
This service uses customer-provided engine components. A replacement core is not included.
Provide VQ37VHR core cylinder heads. Confirm compatibility and condition before ordering.
Confirm the exact cylinder-head application and set scope before ordering.
Service work and components
- Removal, drilling, tapping, and replacement of oil port plugs
- Removal and replacement of freeze plugs
- Stage 3 CNC porting and combustion chamber refinements
- Removal, reinstallation, and reaming of valve guides
- Race-grade valve job
- Valve lash adjustment
- Resurfacing of heads
- Complete assembly of heads
- Supertech intake valves, oversized by +1mm
- Supertech Inconel exhaust valves, oversized by +1mm for increased strength and heat resistance
- Supertech bronze valve guides
- Supertech dual valve spring kit – 70lbs intake and 60lbs exhaust springs
- Supertech valve seals
- JWT C2 exhaust cams featuring 272-degree duration and 11.7mm lift
- Miscellaneous plugs as required
Confirm delivery arrangements before sending parts. Work starts only after the individual intake is approved.
Additional work and replacement parts need approval. Core credit requests require individual approval. No automatic core credit is included.
Photos show manufacturer work examples. The service uses customer-provided cores. Selected options and listed components define the supplied work.
