853 ported vs 799 heads

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Nov 18, 2014 | 10:07 PM

turbo98z

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853 ported vs 799 heads

So I have 2 sets of heads and am new to ls1 engines. 1st pair ported 853 2nd 799 stock heads. The application I'm using them for will be a forged 5.7 stock bore with a turbo and cam. So my question is what heads are better or pros and cons...

Nov 19, 2014 | 09:23 AM

KCS

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From: Conroe, TX

I'd lean towards the 853 heads. Depending on the piston, you may actually be able to use the larger chambers to your advantage since you're using a turbo.

Nov 19, 2014 | 10:30 AM

redtan

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From: Belmont, MA

Quote:

799s better chamber & port design plus the chamber is a few CCs smaller, same as 243s.

You can't say that the 799s have better chamber and port design without seeing and knowing who ported the other heads. Many times, a good porter can transform and improve the design of the head to perform better than the factory cast.

So depending who ported the 853s, I personally would tend to lean to those. If it's a professional CNCer (TEA, AI, WCCH, Livernois, TSP etc.) then for sure as those are quality programs. If they were done by some random guy in his shed with a dremel I would steer away and go with the proven OEM design of the 799s.