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| Use the Product Search to list just the mustang parts that match your vehicle. Images are for reference only and may not be an accurate representation of actual product. Roller Rocker Arms1978 and later with production heads. Cast iron and aluminum GT-40 heads 1.70:1 Bolt-on Inline Same as Cobra 5.0L Mustang. These rocker arms have beefy trunnions for extra long life. Die cast aluminum construction 
1978 and later with production heads. Cast iron and aluminum GT-40 heads 1.60:1 Bolt On Inline For stock production cast iron cylinder heads with hydraulic non-adjustable valve train. Does not require guide plates, hardened push rods or pedestal machining. Includes pedestal inserts and bolts. 
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