Description

3-5/8″ big bore piston set. Used with 3 5/8″ big bore cylinders with 5.330″ (stock) to 5.530″ (+.200″) length. Use with 4-1/4″ stock stroke (88″); 4-1/2″ (93″); 4-5/8″ (96″) to 4-3/4″ (98″) stroker flywheels. 10.0:1 CR. Piston weight 385gr. Piston pin weight 97gr. Head type: Dome / Dome -57cc. Compression height 1.285″ / Bore 3.625″ (3 5/8″). Stroke 4.250″ to 4.750″ (4-1/4″ to 4-3/4″). Rod length 7.440″ / Cyl. length 5.330″ (Std) to 5.530″ (+.200″). Comes with T6 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise. Note: Top compression ring will need additional clearance. See instructions. Note: 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. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation.

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)

Product Details

• Brand: KB Performance Piston
• Category: MOTOR PARTS > PISTONS AND RINGS KITS
• Unit: SET
• Product code: 944688

Part Numbers

MCS Part Number: 944688
Manufacturer Part Number: KB294040