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SVT Shelby GT500
5.4 heads on 5.8 block?
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<blockquote data-quote="Bad Company" data-source="post: 15296518" data-attributes="member: 141815"><p>I know the answer to this one, but if I use the picture of the head I cut in half to explain it. I'm sure that will cause an issue.</p><p></p><p>You have to run the 5.8L cylinder head gasket</p><p></p><p>The extra coolant passage in the 5.8L blocks between the cylinders will still continue to cool between the cylinders properly with the 5.4 heads on the block</p><p></p><p>You'll lose the coolant passage between the 2 exhaust valve seats in the cylinder head, which is there to reduce valve seat temperatures under extreme loads for long periods of time. High valve seat temperatures for extended periods of time under high boost will cause a valve to tulip the head of the valve. As stated earlier the 5.4 head can be drilled to match this passage in the 5.8 cylinder head with a little effort from the machinist doing the work. I would think the machinist will charge extra to do this, because the angle at which the factory drilled this passage originally will require the cylinder head to be set up differently on his equipment to copy it than any other work he will perform to the head.</p><p></p><p>Hopefully my post doesn't create an issue</p></blockquote><p></p>
[QUOTE="Bad Company, post: 15296518, member: 141815"] I know the answer to this one, but if I use the picture of the head I cut in half to explain it. I'm sure that will cause an issue. You have to run the 5.8L cylinder head gasket The extra coolant passage in the 5.8L blocks between the cylinders will still continue to cool between the cylinders properly with the 5.4 heads on the block You'll lose the coolant passage between the 2 exhaust valve seats in the cylinder head, which is there to reduce valve seat temperatures under extreme loads for long periods of time. High valve seat temperatures for extended periods of time under high boost will cause a valve to tulip the head of the valve. As stated earlier the 5.4 head can be drilled to match this passage in the 5.8 cylinder head with a little effort from the machinist doing the work. I would think the machinist will charge extra to do this, because the angle at which the factory drilled this passage originally will require the cylinder head to be set up differently on his equipment to copy it than any other work he will perform to the head. Hopefully my post doesn't create an issue [/QUOTE]
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SVT Shelby GT500
5.4 heads on 5.8 block?
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