Quote:
Originally Posted by chris ok
I do believe some of these vortec heads are getting hard to come by nowadays. There are other heads approved for the combo. I think they are RHS or Dart.
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25534445 is the part number for the bare cylinder head and 25534446 is for the whole assembly. They are still available from many vendors. I believe Michael mans tried all the other approved cylinder heads and he still made more power with the Bow Tie Vortec head.