The E7TE head is also known as the GT40P. Didn't quite realize what you were talking about there. They are roughly equivalent to the GT40s, maybe a little worse or a little better; depends on who you ask really. The only downside is them being aluminum. If that doesn't bother you and you're in freshwater, I say go for it. I know the original cast iron GT40s can get pricey, and the GT40Ps substitute nicely.
See this thread on a mustang forum: http://www.mustangsandmore.com/ubb/F...ML/010959.html
Also here is a flow comparison between the GT40 and the GT40P: http://www.corral.net/tech/powerplant/head_tech.html
Are you planning replacing the stock intake as well? For $200, I believe I would.
To answer your question directly. Yes you will see a considerable increase in performance.
Last edited by DKJBama92Mariah; 09-15-2008 at 11:54 PM.
1992 Supra Mariah - Red
PCM 351HO 285hp - PCM 1.23:1 Transmission
OJ XMP 4 Blade CNC 13x15.5RH
"People do weird things to boats" -Unknown
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