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Old 04-18-2003, 07:18 PM   #6
V8Mustang
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Join Date: Mar 2003
Location: NC
Posts: 64
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5 is what Ford recommends however 5.0 Mustangs & SF did a dyno test and found that their nearly stock 5.0 made around 7 more hp with 4.5 qts than w/ 5. With 5 qts they had aeration problems with 5 qts but not with 4.5.
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