I had to dismantle my throttle bodies to do some work on the manifold and now that I'm re-assembling it I want to get the 2 bodies as close to being synchronised as possible.
Last time they were done properly with a vacuum gauge fitted over each ram tube/trumpet with the engine idling & adjusted for evenness across each pair of bodies. The engine isn't ready to run so that method can't be used yet.
With a lead light shone up through each branch of the manifold, you can see a small difference in light visible with the butterflies in the closed (idle) position. Difficult to see on the pic and it's only slight, but there is a difference.
Question is, even though I'll use the vacuum gauge method again prior to the full engine tune should I bother with the light method to get them closer adjusted, or just leave it as is for the cams run-in period?