| Author |
Message |
    
Phillip
| | Posted on Thursday, March 20, 2003 - 1:16 pm: |       |
I dont know if this has been a conversation in here or not, but i figured it would be a great place to ask. At chevy high performances web site they tell you to stay away from the 906 casting vortec head because of a hardened seat in the exhaust seat that kills mid lift flow. I have not seen this anywhere else. If isnt true then what is the difference between the two. Thanks |
Webmaster (Admin)
| | Posted on Thursday, March 20, 2003 - 1:34 pm: | |
Phillip,
I really wish companies and people would quit making generalized statements like this. If they are going to single out things like this, they need to give the part number not the casing number. There is no difference between the heads produced by the two different casing numbers. GM does and has made some changes to Vortec heads after they have been cast for different applications, one of which, is what they are talking about. When GM does this, they have to give the resulting head a different part number. You can't buy these heads by casting numbers and think that you are being safe from a problem that isn't a problem when then resulting head is used in the application it was intended for. The bottom line is that if you buy used Vortec heads you are taking a chance that you are getting a head that something was altered on to better meet the application demands it would be used for. This applies to either casting number. If you want to be safe, buy the true unaltered Vortec head P/N 12558060 (complete head) or P/N 12529093 (bare head). |
Shawn
| | Posted on Friday, March 21, 2003 - 8:29 am: | |
Actually, Chevy Hi Peformance had an issue last month or the month before that corrected itself saying both castings were good. |
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