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At the front of this small-block are three 1/2-inch pipe plugs. Many engine-builders will tap and install 1/4-inch NPT pipe plugs in these three holes for sealing security. If these holes are tapped, it’s important to check for proper thread engagement.
Plugged In And Ready

 At the front of this small-block are three 1/2-inch pipe plugs. Many engine-builders will tap and install 1/4-inch NPT pipe plugs in these three holes for sealing security. If these holes are tapped, it’s important to check for proper thread engagement.  View Related Article

 

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