Has this OZ head been ported??

[ozconv]

I bought this OZ250 head off ebay last spring. It was supposedly rebuilt. I had a machine shop hot tank it, check it for cracks, mill it for 52CC chambers and reassemble it. They said it was in good shape. It has the 11/32" OZ valve stems but the intake and exhaust are larger than stock (1.77 and 1.476). It looks to me like it has been ported and gasket matched. Can anyone who has ported a head or had it done tell from the pictures below? Also, is there a way to tell if a 3 angle valve job was performed and if hardened exhaust seats were installed? Also, there is some rust on the siamesed exhaust flange. Will this cause a problem with sealing the header gasket?

[img=http://img638.imageshack.us/img638/5025/oz250head019.th.jpg]
[img=http://img291.imageshack.us/img291/2797/oz250head018.th.jpg]
[img=http://img192.imageshack.us/img192/8320/oz250head006.th.jpg]
[img=http://img684.imageshack.us/img684/5572/oz250head007.th.jpg]
[img=http://img714.imageshack.us/img714/4386/oz250head013.th.jpg]
[img=http://img714.imageshack.us/img714/9485/oz250head001.th.jpg]
[img=http://img109.imageshack.us/img109/9485/oz250head002.th.jpg]
[img=http://img641.imageshack.us/img641/3521/oz250head003.th.jpg]
[img=http://img684.imageshack.us/img684/5417/oz250head020.th.jpg]

 

[Bayrunner]

Yes, it is ported. Get this thing on a Flow bench! It looks pretty good though!

Cheers

 

[rbohm]

8) yes it has been ported. you can tell because of the tool marks and how smooth everything is. another easy way to tell if a set of heads has been ported or not is to take a stock gasket and put it up against the gasket surface. if the port and gasket openings match, then the head was ported.

 

[Ronbo]

And where will you get the intake/exhaust gaskets from? I'm asking because I cant get my stuff to seal right with a metal header gasket and home made intake gasket. I'd rather use the correct AUS ones so I have a fighting chance


Ron

 

[rbohm]

8) you might check with azcoupe and see if he can get them for you. also what material are you making your gaskets from? advance auto had actual gasket material in their stores last time i looked.i am not sure if they have them in large enough sheets though to do a six cylinder head. you might also check around your area in the industrial section and see if one of their suppliers sells the material you need.