Worldwide Shipping
We offer shipping to most countries. Simply select your country once you have added items to your basket and you'll be shown an instant price for shipping without having to advance in to the check out process.

×

200,000+ Parts & Accessories
Our catalogue has grown extensively over the years and we now source a huge range of parts and accessories from a number of distributors from round the world.

×

Order Online Or By Phone 
We're more than happy to have customers order which ever way they prefer. If you'd like to discuss anything over the phone prior to ordering we'd be delighted to help you.

×

Simple Exchange Or Refund Policy 
We know when customers receive their orders there is always the possibility of needing to exchange or return items for a refund. Rest assured if you need to, we make it simple. See T&C's for more details.

×

Price Match Promise 
We offer a price match promise on all items we sell. Use the "Seen it cheaper?" option found on the product pages to request a price match.

×
ARH Custom Custom Motorcycle Parts and Accessories ARH Custom Custom Motorcycle Parts and Accessories

KB Performance, 3-5/8 Big Bore Standard Diameter Forged Piston Kit For 1948-1984 Pan, Shovel With 3-5/8 Big Bore Cylinders (ARM208449)

  • KB Performance, 3-5/8 Big Bore Standard Diameter Forged Piston Kit For 1948-1984 Pan, Shovel With 3-5/8 Big Bore Cylinders (ARM208449)
£246.29 inc.VAT
Add to Basket Wishlist
Seen it cheaper elsewhere?

Our Price Promise

Seen this item cheaper on another website? Let us try and match it!

We do our upmost to keep our prices competitive but due to the number of items we sell, you may occasionally find a better price advertised elsewhere. If you have seen a cheaper price on another website let us know by filling in this form. If we’re able to match the price, we’ll look to respond via email with a unique discount code within 1 hour (during working hours) so you're not waiting too long.

Your email:
Where did you see it?
Anything else to add?

Please note:

  1. The item must be identical to the one on our website listing and must show as being available.
  2. Price match applies to items sourced from authorised UK retailers only, not private sellers.
  3. Prices will only be matched from UK based websites with prices in GBP.
  4. ARH Custom reserve the right to price match only one of each item per customer.
  5. ARH Custom reserve the right to withdraw the price match policy at any time.

×

EU stock Estimated shipping date between 2 Apr and 5 Apr.

Usually ships in 2-5 business days

All orders are shipped out of our UK premises. Estimated shipping date between 2 Apr and 5 Apr.

×

About Shipping Costs

Shipping Cost

To view the total cost including shipping please advance to the basket and select your shipping country.

×

Forged 3-5/8 big bore piston set. Used with 3-5/8" big bore cylinders with 5.330" (stock) to 5.530" (+.200) length. Must use 4-1/4" (stock) (88"), 4-1/2" (93"), 4-5/8" (96") to 4-3/4" (98") stroker flywheels.

8.50:1 CR with 117cc head, 4.250" stroke & standard cylinder length. 9.38:1 CR with 117cc head & 4.750" stroke & standard cylinder length. Piston weight 440gr. 

Piston pin weight 97gr. Piston pin diameter .791" / offset. Head type: Dome with -42.3cc. Compression height 1.285". Bore 3.625". Stroke 1.250" to 4.750". Rod length 7.440".

Cylinder length 5.530" standard to +.200" higher. All KB forged pistons are made from 4032 alloy, a 11% silicon alloy that is formed in a forging press. Forging aluminium gives a superior strength and structural integrity on a molecular lever, after which it is fully machined.

The combination of this alloy and the forging process allows the piston to flex under detonation, or pre-ignition, giving the best resistance to cracking. Although 4032 has a low expansion rate, it is higher than the cast Hypereutectcic. 

Therefore forged KB pistons will require about .001" wider piston to wall clearance. Pistons are sold as sets, complete with wrist pin retaining rings, wrist pins and piston rings.

NOTE: All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with each piston set, prior to installation.

NOTE: Stock 5.330" cylinders can be used with stock 4-1/4" stroke. Longer strokes require correct length longer cylinders or stroker plates to achieve the desired compression ratio.

Part numbers +

  • 944802
  • ARM208449

Delivery +

All orders are shipped with either DPD, Fedex, UPS, DHL or Royal Mail. The courier used to ship your order is determined by ourselves once your order has been placed and normally depends on the size, volume and the shipping destination. The selected courier for your order will be quoted in your order confirmation email which you will receive once we have processed your order. Once your order has been shipped, this will be confirmed via email and you will receive a tracking number so you can keep an eye on your shipments progress.

Back In Stock Notification

Send us your email and we'll notify know when this item is available.


×

Shipping Cost

To view the total cost including shipping please advance to the basket and select your shipping country.

×
Copyright ©2008-2024 ARH Custom Ltd.