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1957 Chevy 9" swap HP Loss?
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<blockquote data-quote="NightShade" data-source="post: 2912693" data-attributes="member: 29706"><p>The 9 inch probably has more weight in the reciprocating mass and being rebuilt and a little on the tight side could also be the difference. But I agree it is well within the margin of error ( >1%) and all kinds of other factors will also change the numbers.</p><p></p><p>If I wanted to make some more HP with a minor amount of cash I would probably swap intake and carb unless you want to keep the stock look. </p><p>I heard of what was supposed to be an old school trick for a couple HP on the chevy's was to take one of the oil flow passages on each head and drill/tap it and install a steel nipple so that the oil was forced to the other passages allowing air from the lower end free flow to the top end. The idea was that the moving parts on the bottom end sucked air in and out from the top end and having one passage on each side open would free up a couple HP as it was not fighting the oil flow and it was also allowing the oil to flow from the top end easier rather than to have it being constantly spit back up into the valve covers. It's cheap since the part is basically a piece of 50 cent threaded pipe and as long as you can pull the heads off or not get any particles into the block should be easy to do.</p></blockquote><p></p>
[QUOTE="NightShade, post: 2912693, member: 29706"] The 9 inch probably has more weight in the reciprocating mass and being rebuilt and a little on the tight side could also be the difference. But I agree it is well within the margin of error ( >1%) and all kinds of other factors will also change the numbers. If I wanted to make some more HP with a minor amount of cash I would probably swap intake and carb unless you want to keep the stock look. I heard of what was supposed to be an old school trick for a couple HP on the chevy's was to take one of the oil flow passages on each head and drill/tap it and install a steel nipple so that the oil was forced to the other passages allowing air from the lower end free flow to the top end. The idea was that the moving parts on the bottom end sucked air in and out from the top end and having one passage on each side open would free up a couple HP as it was not fighting the oil flow and it was also allowing the oil to flow from the top end easier rather than to have it being constantly spit back up into the valve covers. It's cheap since the part is basically a piece of 50 cent threaded pipe and as long as you can pull the heads off or not get any particles into the block should be easy to do. [/QUOTE]
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