Hedman Tight Tubes

Mcfarlrm said

Does the coolant need to be drained when replacing the headers on a LA360? I know that the bolt holes at the four corners go into a water jacket. Don't want a huge mess on my hands.

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If you have studs in the end bolt holes then no, you can leave the coolant in there.

If you have bolts there you need to drain the coolant.

Fun fact: I’ve never seen a header for a small block that will take studs in those end bolt holes.