Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
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SHIM-DEX Products

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Shop SHIM-DEX At Speedway Motors

SHIM-DEX has revolutionized the use of spark plugs. With the use of SHIM-DEX spark plug shims you will increase power and provide crucial clearance between the spark plug and piston. Never buy extra spark plugs to have them perfectly indexed again! SHIM-DEX shims are reusable many times over. Index your spark plugs easily and effectively with SHIM-DEX!

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