The S&S 96" Big Bore Kit takes an '84-'99 Evo Big Twin to 96 cubic inches with a 3 5/8" bore, 4 5/8" stroke and 9.75:1 compression. No Shipping to California. 96 inches out of an Evo is a well understood combination, and 9.75:1 is the reason it stays streetable. High compression numbers look better on paper, but on a Big Twin that has to start reliably and run on pump gas, a moderate ratio delivers more usable motor. This kit is aimed at that outcome rather than at a peak figure. How the 96" Big Bore Kit Is Built Cylinders are premium aluminum castings with cast-in iron liners, a combination that handles heat well and rebuilds conventionally when the time comes. The kit is complete as delivered: cylinders, pistons, rings, and head, base and exhaust gaskets all ship together, so nothing has to be sourced separately mid-build. Made in the USA. 96" Big Bore Kit Specifications Fits '84-'99 Evo Big Twin motors 96 cubic inch displacement Bore 3 5/8", stroke 4 5/8" Compression ratio 9.75:1 Premium aluminum cylinder castings with cast-in iron liners Includes cylinders, pistons, rings and head, base and exhaust gaskets Made in the USA Installing the 96" Kit Installation requires crankcase boring and belongs with a skilled technician. Whoever assembles the motor is responsible for checking every clearance and assembly specification before it runs. Plan on retuning afterward.
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