Head porting question

**Logan541** · 02-09-2014

My other car a 1997 Chrysler Sebring, 112,000 miles needs oil cam seals, as well as water pump and timing chain, Since I will have the heads off anyway I was going to port and polish them. My question is, if I do that must I have the PCM reprogrammed or and I just drop them back on and go,also is there anything else I should do while I am in there?

**sseilmnop** · 02-09-2014

Your asking a Pontiac forum what to do with a Sebring?

Unless you no what your doing porting I don't think you will drastically effect the tune. Who knows if you can even tune a Sebring.

**Slick2500** · 02-09-2014

Its a Chrysler, I would just leave it alone.

**Logan541** · 02-09-2014

Originally Posted by sseilmnop

Your asking a Pontiac forum what to do with a Sebring?

Unless you no what your doing porting I don't think you will drastically effect the tune. Who knows if you can even tune a Sebring.

I do own a GP as well and trust the guys here a lot more than anybody else on another forum.As for knowing what I am doing sonny, I probably been playing with cars before you were born LOL, I grew up with real muscle cars in the 70's I just never did one on a car that had a PCM and looking to have some fun while I have it apart. and BTW its "know" not "no"

**machinegunsquid** · 02-09-2014

^ XD

As long as you know what you're doing with the head porting, have at it.

You wont need a retune, though to maximize performance you should (but that's obvious for any motor work)

**coolone** · 02-09-2014

If you have no other mods to the air coming into or out of the engine, then why would you? There'd be a minimal benefit without changing other flow characteristics... Just sayin!

or if you have nothing but wasting you time in mind, go for it.
: )

**Iceman6669** · 02-09-2014

I am not sure on what kind of "gains" you will see from it but it for sure wont hurt. The way I see it ANY time you let the motor breath a little better you are making headway.

**Logan541** · 02-09-2014

LOL ok guys lemme 'splain, old hot rodder enjoys working on cars can't afford and old muscle car to build from the ground up and jut missing it, plus it's "therapy" gets my mind off things and takes me back to happier times of my youth, gonna be replacing cam seals anyways so figure while I am in there;"why not?" That clear it up any?

**Iceman6669** · 02-09-2014

I 100% say do it.... If they are off/almost off I would do it.

**Logan541** · 02-09-2014

Just wanted to be sure I did not have to re-tune pcm

**Iceman6669** · 02-09-2014

like said above, No you dont have to, but you could to get some gains.

**Logan541** · 02-09-2014

Thank ya Iceman

**coolone** · 02-09-2014

No tune needed, if you're going to just polish things it will make flow slightly better but no gains. If you decide to take some material off, less is more is the key : )

there's a good thread on here somewhere, search it, about porting heads, or just google it, make sure you understand what you want to do prior to doing it, have a plan of attack. Dremels will take forever, die grinder will take off a lot of material fast and really isn't recommended for a first timer. Lol... I wasn't trying to discourage you, rather just let you know my $.02 that unless you also open up the intake and the exhaust with at least minimal changes, that it (porting) isn't worth it. But many of us have gotten the bug by starting with just fixing this or doing that, lol, winding up with a full rebuild.

Good luck!

**Fivefingerdeathpunch** · 02-09-2014

You couldn't even toon a 97 Chrysler sebring anyway lol.

**TwiztdWun** · 02-09-2014

You can tune a piano.... but, you cant Tuna Fish or a Sebring.

**16MustangVet** · 02-09-2014

I vote death by fire esp if it has a 2.7 in it

**Logan541** · 02-09-2014

LOL oh I am going to port not just polish, its a 2.5 yeah I know not much you can do with them but it's a $2,300 toy with 112,000 miles and near perfect body and mint interior and new top found the cam seal issue and oh well figure lets play just wish you could get headers for it.I did find a ram air hood though and did pick up a nice spoiler

**sseilmnop** · 02-09-2014

Grind away. It will run without a tune.

**FASGP** · 02-10-2014

Originally Posted by Iceman6669

I 100% say do it.... If they are off/almost off I would do it.

I don't think I can ever remember a set of heads that were on the bench that went back in stock...even for a Sebring. Do it...while at it, take a look at the exhaust primaries and clean them up as well...

**indygrandprix** · 02-10-2014

Be careful when you port the exhaust ports on cylinder 1 i think. I was porting the heads on my avenger and ported right into the coolant passages. I'm not sure if it was a flaw in the casting or if they are all like that but be very careful with how much you take off. I'm sure you already know that if youve been doing this awhile but just a heads up.