Long time lurker, first time poster... Need some advice regarding the merge of two different websites, maybe someone could spare a minute?
Site A - optimized for Country X (non-US), aged local domain, all content (200+ unique articles) in local language, ~3k visitors a day, quality backlinks etc. Far ahead of the competition for all relevant keywords.
Site B - .com domain, 250+ unique articles in English (content more or less identical to Site A, just translated), ~1.5k visitors a day, some backlinks, traffic slowly but steadily growing. Ranking 6th-7th for main keywords, 2nd-3rd for long tails.
I was thinking about 301'ing Site A to a directory in Site B (e.g. SiteB/languageX). What effect would that have on Site B rankings (for the main domain)? Could such a move "dilute" the keywords, with new non-English content? Would the SEO juice simply get passed from Site A to Site B?
I do not mind wrecking Site A's ratings if that gets me +2 or +3 positions for Site B. Is there any other way that I could leverage Site A to boost Site B (e.g. placing backlinks to Site B on Site A, with English anchor text)?
Any advice would be really appreciated.