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Old 11-13-2011, 07:54 PM
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They`re typical smog heads released in the early 70`s. They have the large 76cc chamber to low compression to meet smog requirements.
They aren`t peformance heads and really weren`t worth investing big valves into. All the old chevy heads such as the camel backs few bother to run anymore when you can get a set of Vortec heads and be 30 horses over any of the other factory heads is why.
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