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Old 10-03-2012, 08:54 PM
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The 350 will need the heads with smaller valves.The bore size restricts the clearance between the cylinder wall and the valve, causing valve shrouding, basically impeding flow. if you look at the top of the cylinder bore of the 350, you will see 2 notches in the top of the bore.This is a relief or "chamfer" to help airflow around the valve as it is so close to the cylider wall that it wont allow good airflow in that area without it.
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