Springs do not increase acceleration. A stock spring is made to function within a certain perimeter. A stock spring for instance will work proficiently within a certain rpm range. When increasing the power band to higher rpm's the stock springs could cause valve float, or running a cam with an excessive lift can cause valve bind. One must be careful when choosing the correct valve spring for if too weak valves will eventually float causing the piston to contact the valve whereas if too strong the valves will beat themselves into the seats.
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