turbo98z

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...

KCS

iTrader: (20)

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.

redtan

iTrader: (5)

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.

dogsballs

Will 853 even fit on a 5.7? Usually no

KCS

iTrader: (20)

853's came on stock LS1's, so yeah, they fit.

You must be thinking of 823's. Those are L92 style heads.

dogsballs

lol, ignore my half asleep post.

turbo98z

Thank you guys. I don't know who ported the heads but it doesn't look like a machine did it lol