05-09 Stock Heads Max HP
11-12-2010, 02:00 PM
#1
5th Gear Member
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Join Date: Jun 2007
Location: Wheeling, IL
Posts: 3,748
05-09 Stock Heads Max HP
So, little argument on a different forum. I am being told that the Stock heads on an 05+ Mustang GT won't fail even with 800 RWHP.
Can anyone that has knowledge on the heads chime in? I have read that after 500 RWHP, the Retainers go bad, and in some cases, a Valve can be bent, etc.
So, what are the safely rated at before you should replace the valve material, port the heads, etc.?
Thanks for the help!
Can anyone that has knowledge on the heads chime in? I have read that after 500 RWHP, the Retainers go bad, and in some cases, a Valve can be bent, etc.
So, what are the safely rated at before you should replace the valve material, port the heads, etc.?
Thanks for the help!
11-15-2010, 09:34 AM
#3
5th Gear Member
Join Date: Oct 2009
Location: Oregon
Posts: 2,645
It partially depends on the RPM you're running. After a certain RPM, you'll experience valve float and can risk damaging the engine. That isn't so much a HP thing though. I haven't heard of retainers going bad though and have certainly seen a few 500+rwhp stangs out there on stock heads. That isn't to say that they wouldn't be better off with aftermarket heads though.
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