SBO timing cover crank seal runout tolerance

[AButler]

So I decided to make a aluminum timing cover for my SBO. Now I'm wondering about how spot on the crank seal hole needs to be I haven't measured it yet so I don't have any numbers for you guys to compare. Basically what I'm wondering is if I need to make the part the seal presses into bolt on or does the seal have enough tolerance factored in that if I just weld the hub piece on it will still seal. I placed it against the factory steel one it it's pretty close but the factory one isn't very round and this one was laser cut so it's really round.

https://static1.pt-content.com/images/pt/2014/07/5AD9D4DBA2444561AFB90361263E0E98_zpszoy6-1.jpg (http://s307.photobucket.com/user/AButler16/media/5AD9D4DB-A244-4561-AFB9-0361263E0E98_zpszoy6rrvs.jpg.html)

[AButler]

Well decided to weld it up. Then added some hard coat black anodizing for some corrosion resistance at the water pump area

https://static1.pt-content.com/images/pt/2014/07/B29922F1BE80401488BB9679553702DD_zpssd6q-1.jpg (http://s307.photobucket.com/user/AButler16/media/B29922F1-BE80-4014-88BB-9679553702DD_zpssd6qpu8p.jpg.html)

https://static1.pt-content.com/images/pt/2014/07/DC15B210E3D0435E9A7E67814D5848A3_zpsg4em-1.jpg (http://s307.photobucket.com/user/AButler16/media/DC15B210-E3D0-435E-9A7E-67814D5848A3_zpsg4emnfvc.jpg.html)

[83hurstguy]

Interesting. Any reason you decided to make one?

[AButler]

The steel one had a lot of pitting where the gasket goes so i needed to replace it. Was looking for a aluminum one and found they were around 225 for a stock style and felt that was a little high so i set out to make my own. I do engineering and design work using Autodesk inventor. At my work i have access to Lasers for cutting and CNC machines and lots of left over material. Outside of that no real good reason.