You don't consider the champion completely in this, and your view of supports seems askew as well.

Like what previous poster said, This build is like just completely ignoring Blitzcrank's passive. And the reason people buy a Manamune is because of the ridiculous amounts of mana it gives him AND gives him AD dependent on the mana he has which he has alot of.

Frozen heart is only bonus mana item - which gimps Blitz's passive MAJORLY. Your not understanding the character if you don't work with their passive.

Your build will make you pretty much useless in any team fight by mid and late game.
At no point you have explained any type of game play to support blitz.

This guide is incomplete.

nice guide, good use of bb´code, but that you dont buy manamune because ure support is a little bit stupid, because it does not cost that much and its extremely awesome on him (: +1
Edit: Clairvoyance is always important, even if you buy wards.

overall, your guide is simple, but could really use some extra coding. for instructions check out jhoijhoi's guide on making a guide. i really disagree with your skill sequence. much is prefered to max something at lvl 9, 13, and 18. rejudge your decision on that. overall for your items chapter, i think that many more situational items should be added. more chapters should also be added and overall, this guide could use some extra depth.

keep up the good work!

maybe you could check out my blitzcrank guide for ideas on things to add on? Its in no way incorrect and a great build imo but really doesnt offer much in terms of a guide. overall your build is pretty much cookie cutter and very very similar to what i would build, i might put the glacial infront of the mercs treads and rush an early oracles though.

It sucks because your comment had nothing to do with the information of the guide but how it was formatted. I know good presentation is a big plus, but I just want to give out information in a simple manner.

So, there is a lot to work on with this guide. Have a stop by Jhoijhoi's guide about making guides and see what nifty little tricks you can use to make your guide look better.
Don't be afraid to archive a guide and re-publish it later.

Good start, but it needs lots of work.