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Old 10-27-2003, 07:59 AM
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retorque head gaskets- hot or cold?

Fired up the rebuilt Y block yesterday and it really ran great. Fired right up, and I ran it for about 20 minutes at 1500-2000 rpm. All seems fine except for some oil leakage from the bottom edge of the head to block interface. I used steel shim gaskets coated with hylomar, block was decked, heads resurfaced

I want to retorque the heads, but have always wondered if this should be done with the engine hot, warm or cold?

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Old 10-27-2003, 08:06 AM
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Cold.
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Old 10-27-2003, 10:30 AM
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always when cold because if you have aluminum heads they expand 2x the amount of cast.
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Old 10-27-2003, 12:53 PM
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The heads are cast iron. To me it makes intuitive sense to do it cold because when hot, everything expands and "tightens up" does it not? I have to remove the exhaust manifolds and the rocker arm shafts to do it in any case. It would be more convenient to do it cold that's for sure. How much running time/mileage should accumulate before retorque?
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