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SVTPerformance's Chain of Restaurants
Road Kill Drive-Thru
99/01 cobra VS 2007 GT
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<blockquote data-quote="Ben99GT" data-source="post: 6603188" data-attributes="member: 3519"><p>A .020" overbore (standard rebuild) has virtually no impact on cylinder head flow, so you will see basically the same gap in flow on a 3.552" bore as you see on a 3.572" bore. </p><p></p><p>The 4V has larger intake valves (37mm vs. 34.7mm) and an extra exhaust valve, they outflow 3V heads. </p><p></p><p></p><p></p><p>4V heads outflow 3Vs slightly below .200" lift and take off after that. In fact, that's why stock 4V cams can get away with only .390" lift as opposed to the 3Vs .440" lift.</p></blockquote><p></p>
[QUOTE="Ben99GT, post: 6603188, member: 3519"] A .020" overbore (standard rebuild) has virtually no impact on cylinder head flow, so you will see basically the same gap in flow on a 3.552" bore as you see on a 3.572" bore. The 4V has larger intake valves (37mm vs. 34.7mm) and an extra exhaust valve, they outflow 3V heads. 4V heads outflow 3Vs slightly below .200" lift and take off after that. In fact, that's why stock 4V cams can get away with only .390" lift as opposed to the 3Vs .440" lift. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Kill Drive-Thru
99/01 cobra VS 2007 GT
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