KB294STD 3-5/8" big bore piston kit. STD
Fits: 48-84 Big Twin with 3-5/8 big bore …
incl. VAT
Chapter members save 15% · Sign in for member pricing
Estimated delivery: 3–15 working days
Authorised
Iron City Dealer
14-Day Returns
Easy & hassle-free
Secure Checkout
256-bit encryption
Free UK Delivery
On orders over £100
Specifications
- Brand
- KB Performance Piston
- Part Number
- KB294STD
- OEM Reference
- —
- Pack Quantity
- Sold as a set
- Category
- Pistons And Rings Kits
- VAT Rate
- 20%
About This Product
For those building a high-performance Shovelhead or Ironhead, this KB Performance 3-5/8 inch big bore piston kit is a serious upgrade. Sold as a set, these pistons fit 1948 to 1984 Big Twins equipped with 3-5/8 inch big bore cylinders and strokes ranging from 4-1/4 to 4-3/4 inches, covering 88 to 98 cubic inch engines. These are T6 heat-treated 390 Hypereutectic cast pistons with a 16% silicone content, allowing for tight clearances and quiet operation. With a 10.0:1 compression ratio and a 57cc dome, they are designed for longevity and power. Note that the top compression ring requires additional clearance during installation, and technicians should verify all component clearances before final assembly to ensure peak performance.
Manufacturer part number: KB294STD.
Fitment
48-84 Big Twin with 3-5/8 big bore cylinders and strokes from 4-1/4" to 4-3/4" (88" to 98" engines)
Related Products
View all →
KB Performance Piston
Piston set +.005
KB Performance Piston
3-5/8" big bore piston kit. +.010"
KB Performance Piston
1340cc Shovel piston kit. +.005"
KB Performance Piston
883-1200 big bore piston kit. +.020"
KB Performance Piston
1200 XL piston kit. +.005"
KB Performance Piston
1340cc Evo B.T. piston kit. +.040"
KB Performance Piston
1340cc Evo B.T. pop-up piston kit. +.030"
KB Performance Piston
XR1200/Buell XB piston kit. STD
More from KB Performance Piston
View all →Piston set +.005
3-5/8" big bore piston kit. +.010"
1340cc Shovel piston kit. +.005"
883-1200 big bore piston kit. +.020"
1200 XL piston kit. +.005"
1340cc Evo B.T. piston kit. +.040"
1340cc Evo B.T. pop-up piston kit. +.030"
XR1200/Buell XB piston kit. STD
Who are we? Leeds Harley-Davidson - Iron City Motorcycles
This product is fulfilled by Iron City Motorcycles, Leeds' authorised Harley-Davidson® dealer, serving the UK with a full range of Genuine Motorclothes®, dealer merchandise, and official Harley-Davidson parts & accessories — available for UK and international delivery.
From OEM Parts to retro lifestyle wear to aftermarket stockits we have what you need to keep you riding all year round.
Use our official OEM parts finder to browse our full Genuine Harley-Davidson® Parts and our associated approved aftermarket catalogues.