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Re: 250 x-flow into an XA
heatseeker stage5 cam, anti pump-up lifters, BALANCE IT, lighten flywheel, port head, larger valves, Redline torker manifold, 350/500holley, 200CI flat top pistons on 250CI rods to boost compression-up around 11-11.5:1, Optimax, as minimum, prefers Avgas or shell racing fuel. Had this combo in a speedway car, not sure on exact power output but 3rd gear donuts were a hell of a ride.
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