The Block 3 Booster Header Test Tank 3 is a test article located at SpaceX's McGregor test facility consisting of the Block 3 Super Heavy Booster's header tank undergoing testing. [1]
History[]
The test tank was first spotted arriving at SpaceX's McGregor test site in October 2025 where it was placed in storage.
In January 2026, the tank was raised vertical and on January 30th 2026, covered with the same cryo shell as tanks 1 & 2 for testing.
Testing Campaign[]
Gallery[]
Test Tank with Load Testing head install and cryo shell to the side
Test Tank at McGregor
Test Tank on arrival at McGregor from Starbase