Best LS Porting and Polishing Service
On The Tree
Joined: Feb 2020
Posts: 199
Likes: 55
From: NJ
I literally just posted about not wasting money on porting 15 year old heads that will probably end up leaking coolant. Run them as is. Its's really not worth on it a 5.3.
In fact you will make more power with 862/706 heads on 5.3 and a thinner headgasket. You would have to mill the 799s, lose piston to valve clearance to make it even worth it and port them on top of that. Did I mention having to buy a different length pushrod if you milled the 799s?
If you are going boost then you will only see maybe 20-35whp on the dyno. That's usually 1-2 psi of extra boost.
The power difference between a 5.3 with ported 799/243 and a 6.0 with stock heads is still huge.
In fact you will make more power with 862/706 heads on 5.3 and a thinner headgasket. You would have to mill the 799s, lose piston to valve clearance to make it even worth it and port them on top of that. Did I mention having to buy a different length pushrod if you milled the 799s?
If you are going boost then you will only see maybe 20-35whp on the dyno. That's usually 1-2 psi of extra boost.
The power difference between a 5.3 with ported 799/243 and a 6.0 with stock heads is still huge.
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TEA Stage 2's are the best, by far, for a cnc'd stock cathedral. AI was real good, but having major business issues, not currently recommended. I have no idea wtf anybody is recommending in this thread. FED cant port a stock cathedral worth a ****, and cheapo porting is questionable at best. If you are paying for a service, get your $$$'s worth. The TEA's are proven to make power. Porting a set of 862's is better, just for the better compression. Do a lot more homework before just throwing $$$ around.
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TECH Apprentice
Joined: Apr 2019
Posts: 365
Likes: 133
From: California
Price is not always connected to quality of work. Stock or ported will work. Remember it's effective and efficient cylinder filling that you want. The throat and bowl are a major pinch point that needs work.
Joined: Jul 2007
Posts: 1,503
Likes: 177
From: ELSA, South TEXAS (956) 802-7700
Always cheaper to go with what you got. If you got 799s already, just mill .030 to slightly increase compression. 799s airflow is quite sufficient for a 5.3. You can still run a decent sized cam with consideration for intake duration and lsa. Use money instead for a better intake like a fast. Or if you have an ls6, then maybe stall and gears...