Oh, I am darn sure Manifold was mostly upright; Manifold Outlet alway on table top sealed&taped to vac hose, while Long Branch body rested against a CYL head for steady, while flanges were up-in-the-light for me to see clearly while grinding.
Happened to BOTH DS & PS manifolds.
House Vac is strong but we're talking fairly constant "pull' through a port path while grinding THEN discovering the blocked ports "feature" many iron shards stuck to the tape. That means All the shards travel down a Primary leg, most hit the outlet, yet Many ( about half) found ability to travel-back-up remianing 3 dead legs to stab the tape & stick.
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Tis prompts me to re-open my notes on exhaust pulse timing & Crossover torque-tube concept. World rather have many set of eyes doing this so I don't have to. HIS
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