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Returns policy

Last updated 4 November 2026.

30-day returns

You can return unused parts in their original, undamaged packaging within 30 days of delivery for a refund or exchange.

How to return a part

  1. Contact us with your order reference and the parts you want to return.
  2. We reply with a return number and the address to send them to. Parcels without a return number may be refused.
  3. Pack the parts securely and send them with a tracked service.
  4. Once we receive and inspect them, we refund the original payment method within 5 business days.

What cannot be returned

  • Parts that have been installed, modified, painted or run.
  • Electrical parts and gaskets once the packaging is opened.
  • Special-order parts and complete automobiles.
  • Gift cards.

Return shipping

If we sent the wrong part or it arrived faulty, we pay for the return. Otherwise, return shipping is paid by you, and original shipping costs are not refunded.

Faulty after installation? That is covered by our warranty instead.

More from Help

Performance and aftermarket parts

Performance parts, shipped today.

0 parts for Chevy, Ford, GM LS and Mopar builds, from gaskets to crate engines. Free shipping on orders over $150.

Free shipping over $150Same-day dispatch before 3 pmTrack every order onlineMilitary & first-responder pricing

Today's deals

Special pricing, while stock lasts.

Shop by department

Everything between the bumpers.

Eight departments, with fitment notes on every part and a part number you can reorder by.

The store

On the shelf right now.

Best sellers, special pricing, clearance and outlet stock. Everything marked in stock ships today.

Full catalog

Browse every department.

0 parts across eight departments. Pick a category, filter by engine, sort by price, and open any part for a closer look.

Assembly · Complete systems

Matched on our bench. Ready to fit.

Crate engines, top end kits, supercharger kits and ignition systems assembled and checked before they ship, so every component arrives already working together.

ROTOR A 3-LOBE INJECTOR HAT DRIVE CASE 248 MM
Fig. 1 · 6-71 roots blower9.5 psi at 6,000 rpm

Merchandise

Gear for the shop floor.

Motor Base apparel, drinkware, signage and gifts, in the same black, red and gold as the store.

Rewards

Every dollar builds your status.

One point per dollar, double and triple on selected parts, across seven tiers from Red to Black. Once you reach a tier it holds for a full year, and Gold and above get a dedicated account manager.

$3,400
3,400Points
$2,600To next tier
Yellow

Test drive game

Pick a car. Drive the city.

Take a supercharged muscle coupe, a big-block classic, a V8 pickup, a turbo rally sedan or our concept car for a spin around a 3D city. Every car has its own engine sound, gearing and grip, and you shift with a real clutch.

Optional and free. The game only loads when you press play. Open it full screen.

Complete automobiles, built to order

Tools & resources

Measure twice. Order once.

Install guides, catalogs and engine calculators. The calculators are pre-filled with a typical 350 small block.

Compression ratio

9.80Ratio : 1
355Cubic inches
5.8Litres

Pump-gas friendly on 91 octane.

Trap-speed power

373Wheel hp
12.2Est. ¼-mile, s

Uses the classic trap-speed formula. A ballpark figure, not a dyno sheet.