VIPERBLUELX

iTrader: (2)

I swapped my stock 243's for ported 243's, no other changes. The car was dyno tuned by Vengeance with the other mods so I don't know if I'll need a new tune or if I can wait till I do a Fast 90/90 then retune?

68birdls1

iTrader: (46)

You should be fine until you get your 90/90, but you def won't be getting the ost out of your setup until then. More than likely will run rough or "sluggish".

LS1C5Vette

iTrader: (11)

Your A/F ratio is going to be a bit off now due to more airflow

BlackScreaminMachine

iTrader: (17)

If the heads were milled in ANY way, then I would go to verifiy the A/F.

LS1Z28_98

I would say it needs to be touched up, but I think it would be OK until the 90/90. I re-did my exhaust and didnt have it tuned for a year or so until my cam and springs were done.

Eurospec2

iTrader: (2)

You really should get it re-tuned, the change in airflow characteristics of the ported heads could cause you to run lean up top, not good

TXZ28LS1

iTrader: (5)

hey viper, make sure you post up the results man! im running the same cam.

tylerdj

iTrader: (31)

Many places offer free re-tunes or a re-tune with just the cost of dyno time. I would go ahead and get the tune now.

Ls1Gummi

iTrader: (2)

I would. That would be the only way to get correct A/f and hp out of your setup.

VIPERBLUELX

iTrader: (2)

Yeah Vengeance has free retunes, just pay $150 for dynotime, but it's over 2 hours away and I hate to do that then get the new intake and have to go back again, lol.

slp--firehawk

If you dont go on long drives you should be ok though I would advoc ate you get a retune asap. If you get on the highway or run to many consecutive minutes the atoms in your catalytic converters will start getting murdered, melting and taking new form as they have to oxidize to much hydrocarbons from a flawed tune and thatll creat back pressure and power loss when you do get it tuned right. I know when I was like 16 I had my tune a little off on a v6 and I went on a bit of a road trip and my cat was just done for after about 400 miles and it cost a tone to replace.

VIPERBLUELX

iTrader: (2)

I don't have any cats

davered00ss

iTrader: (4)

i would get a re-tune.

Ban1dit

iTrader: (1)

I would wait. If the 90/90 is coming soon it is not worth driving 2 hrs. for something that yhou really won't feel. Do it when you get the 90/90, you definately will feel the benefits of those ported heads.

VIPERBLUELX

iTrader: (2)

Yeah my tuner said that a retune won't be necessary after just swapping the heads, but when I get a FAST I'm gonna head down there for them to tweak it.