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svtfox-Build Thread. 04 powered fox
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<blockquote data-quote="SlowSVT" data-source="post: 12921321" data-attributes="member: 20202"><p>The reason I ask is a friend of mine repairs cast iron cylinder heads for industrial diesel engines. Having experience with both steel (intake) and bronze (exhaust) guides in the same engine I noted how all the bronze guides needed replacement at rebuild time while the steel were fine. I asked him about this and he stated for the same reason he never uses bronze and always ops of steel. The factory mod motor valve guides are powdered metal with is very hard and will resist the heat better than bronze. Ford did not cast a boss around the exhaust valve guides for flow reason but this leaves the valve guide more exposed to the exhaust blast.........bronze has a much lower melting point than steel and will get somewhat softer under the exhaust heat. A valve rocking in the guides will hammer out the valve seats.</p><p></p><p>Just something to consider</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 12921321, member: 20202"] The reason I ask is a friend of mine repairs cast iron cylinder heads for industrial diesel engines. Having experience with both steel (intake) and bronze (exhaust) guides in the same engine I noted how all the bronze guides needed replacement at rebuild time while the steel were fine. I asked him about this and he stated for the same reason he never uses bronze and always ops of steel. The factory mod motor valve guides are powdered metal with is very hard and will resist the heat better than bronze. Ford did not cast a boss around the exhaust valve guides for flow reason but this leaves the valve guide more exposed to the exhaust blast.........bronze has a much lower melting point than steel and will get somewhat softer under the exhaust heat. A valve rocking in the guides will hammer out the valve seats. Just something to consider [/QUOTE]
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