It depends what the changes in the title you are going to do?
1: If you are changing the title completely along with the content of the page, next time the spiders will find a different page than what it was having in past and will change the complete index of your website.
Result: your site disappear from SERPs for some time for present keywords.
2: If you are just introducing 1 or 2 keywords in existing title and putting some more text on the page to justify those keywords, the spiders will find some more than what the site was having in past.
Result: No or very minor affect on ranking for previous keywords. But the newly introduced keywords will take time to show in SERPs. You will have to build links for those keywords.
|