SPOOLED UP

iTrader: (2)

Anyone have real world power differences? Per say a before and after of the EXACT same setup with just porting the heads and possibly leaving the stock CC.

Display your power output and/or gains and setups,

thanks

Black98s10

I really would like to know also

SPOOLED UP

iTrader: (2)

well everyone has stock heads on these setups. BUt how bout some hand ported or true ported 706 heads? I would like to know what happens to the numbers on these setups

got-a-ls1

iTrader: (12)

arnt 706 heads the ones that had problems cracking on 5.3s?

Black98s10

The Castech castings have a problem with cracking

anheuserbusch08

iTrader: (11)

do a mild port job and blend the bowls. you should have excellent results. if youre boosting it just mill them .005 to clean them up they are good heads for a boosted setup

2000RATA

There is no question it would pick up power. But they need to be well ported. Not just a bowl blend. That won't be enough. N/A you could see 50+ hp gain from porting. Throw 15 psi on top of that and see double. I wish the 5.3 boost guys would start using ported 5.3 heads. They would be way happier with them than stock 317's or 799's/243's.

JRENIGAR

iTrader: (37)

Good to hear as Im looking at buying an 05 5.3 with the 799 heads. Is there a tutorial on how to port the better ls castings such as the 243's or 799's? Im wondering if it will be a dog compared to my stock ls when not in boost.

pwrtrip75

iTrader: (8)

I just put a 5.3 in my car and ported the 706's on it. No base to compare how it was before because i didnt run this combo with a 5.3 before. The upper RPM's seem to pull harder than my 370 did at the same boost level and broke my driveshaft shifting into 2nd... Havnt quite fixed it yet and probably wont have it out again till next year to see what it runs.

LS1NOVA

iTrader: (12)

Having the 799 heads on my 5.3 ported this winter. Results in the spring. Bigger cam and intake though too so wont know exactly how much the gains are.

p8ntslinger676

Im going to be using the PRC 2.5 706 heads on my 383 build with the full cnc port, already have them just waiting on my short block at the machine shop, hopefully ill have the car back up and running before summer time. its going to be a killer street combo with some small twins on it