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Old 08-14-2010, 04:41 AM
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maximum torque

Own a 1987 Chevy 5.7 fuel injection engine. I used propane to attempt to detect a leak. I got a small verification of the engine's rise in idle after going completly around the manifold. I guess about midway on the passager's side a spam of one inch of area the engine rose in idle. I got the bolts torqued down to 43 foot pound. Can I take my torque up to 48ft lb? I am not sure if the manifold is cast or aluminum. If you got both specification that would help out a great deal. For the record I have taken the TB off of the manifold and replaced the gasket under it and gave it a good cleaning. The manifold is stock. I've post previous threads on this subject about 3or 4days ago.

Tommy

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Old 08-14-2010, 06:59 AM
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Usually once you have a leak between the head and the manifold, no amount of retorqueing will fix it, especially if the gasket is more than a few years old. It is time to replace the gasket. Going higher on the torque runs the risk of pulling the threads out of the heads, you are already over the recommended torque of 25-30 ft.lbs.
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Old 08-14-2010, 02:53 PM
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If you need to torque the intake bolt to 43 pounds and still have a vacuum leak then your gasket it shot. Do it right and replace the gasket, it's really not to difficult. Just make sure you drain the coolant completely.
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