Valve train noise

I was just pointing out that BB's are not exactly straight and SB's are perfectly straight. So side play is not as critical.

You missed the point of my post.
Which is that the BB pushrods are in fact straight up and down with heads that don’t require heavily offset rockers, like the example you posted.

Btw, when a SB uses heads that require the use of rockers with the big offset, the pushrods aren’t straight up and down on those either.

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