Big block Chevy heads
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| − | == | + | ==Torque sequence for big block aluminum heads== |
| − | + | [[File:Bbc head bolt tightening sequence.jpg]] | |
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| + | ==Special considerations== | ||
Aluminum heads require parallel ground hardened steel washers under the bolt head or nut to prevent galling the aluminum seat. Some or all bolts/studs are often a different length than the bolts used on the stock cast iron head. If aftermarket hardware is used, follow the manufacturer's instructions for lubrication and torque specs. Otherwise, tighten the hardware in at least three steps. New hardware should have the threads burnished before final torque is applied (see manufacturer's instructions). | Aluminum heads require parallel ground hardened steel washers under the bolt head or nut to prevent galling the aluminum seat. Some or all bolts/studs are often a different length than the bolts used on the stock cast iron head. If aftermarket hardware is used, follow the manufacturer's instructions for lubrication and torque specs. Otherwise, tighten the hardware in at least three steps. New hardware should have the threads burnished before final torque is applied (see manufacturer's instructions). | ||
Use anti seize compound on all threaded aluminum bolt or sender holes, especially the spark plug threads. Only remove fasteners or senders when the head is cold. | Use anti seize compound on all threaded aluminum bolt or sender holes, especially the spark plug threads. Only remove fasteners or senders when the head is cold. | ||
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[[Category:GM]] | [[Category:GM]] | ||
[[Category:Engine]] | [[Category:Engine]] | ||
| + | [[Category:Fasteners]] | ||
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