Did some cylinder head prep today.

[Boydsdodge]

Getting heads ready for Tux's head swap that needs to be taken care of in the near future.
I did a bunch of port clean up on a pair of heads I have here, some gasket/port match, clean up rough stuff in the bowls, ports and casting flash.smooth the exhaust.
I did not want to open up but clean up and make equal as I could.
These are a pair of 906 heads with hardened seats installed, I have a set of 452 heads that will be dropped at my machinist for a check up and tank cleaning before we do any work on the 452 heads.

 

[Boydsdodge]

Then
i started with the exhaust manifolds port matching.
I set the heads on manifolds, find what ones match closest. Then I hook up the vacuum to the exhaust manifold with the cylinder head and spray a lil paint into the exhaust bowl. When I lift head from manifold I am left with the areas that I need to clean up on the manifold.

 

[Boydsdodge]

Few more pics of the port/paint results. After this I will port the manifold to remove the paint. I have stamped the head left and right to keep matched on install.

 

[70bigblockdodge]

Blend the guide bosses instead of the sharp blunt edge. If you narrow it at the upper radius it allows more air in a pinchy area of the port. Keep the area under the seat no bigger than 90% of the seat ~ 1.87". Be careful raising the roof around the guide, gets thin.