Vortec L31 cylinder head
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Speak to a machine shop beforehand to find out the details (can they inspect adequately with the heads assembled, or do they need to be apart? Does the inspection require being fully cleaned before inspection? How long will this take? How much does it all cost?) '''before''' contacting a prospective seller so you can lay out the plans to them. Don't expect the seller to pay for all or part of the inspection- if they fail, consider that as one of the costs involved with using used heads. | Speak to a machine shop beforehand to find out the details (can they inspect adequately with the heads assembled, or do they need to be apart? Does the inspection require being fully cleaned before inspection? How long will this take? How much does it all cost?) '''before''' contacting a prospective seller so you can lay out the plans to them. Don't expect the seller to pay for all or part of the inspection- if they fail, consider that as one of the costs involved with using used heads. | ||
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| + | ==Head inspection== | ||
| + | [[File:Cracked 062.jpg|thumb|400px|left|Crack possibly caused by over torquing]][[File:400px-Induction hardened seat vortec1.jpg]]<br style="clear:both"/> | ||
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| + | It is obviously best to have a reputable machine shop inspect your heads for cracks. If you don't have access to the tools needed they can also do the rest of the inspection for valve and valve guide condition, whether a valve job is needed, etc. | ||
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| + | Vortec heads tend to crack in the center two cylinders more than the ends. Places to look for cracks are shown above; often between the exhaust and a head bolt hole or water jacket hole, Sometimes the crack will be from the valve seat down into the port. Because the cracks can be very small, using a magnetic particle inspection system will show defects not readily visible to the naked eye. | ||
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| + | The image on the right shows a center chamber next to an end chamber, but remember there's a better chance the cracks will be in the center two chambers. | ||
==Vortec L31 5.7L head ID== | ==Vortec L31 5.7L head ID== | ||
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