The benefits of polishing are just not there with a forced induction system unless your shooting for 600+ hp.

Like check this.
I asked Joey at terminator about it.
He's running multiple 500+ hp trucks.
He does NOT port and polish.
He says its not worth the money.

I'm not saying there are No benifits to it, but cost vs what you get, it could be better spent elsewhere than the polishing.

Best thing to do would be a nice valve job.

 

There are many opinions on PNP like William said.
The 7.3 have really thin walls and to do a 'traditional' PNP you'll grind through and have junk heads.
So just a light clean up in theory would help, but with the turbo pushing the air the result is negligable gain in air flow.
Yes, every bit helps, but only if you yourself will do a very light PNP job and not have to pay for it. The minimal gains don't show hp gains on a dyno and it's not worth paying $$$ to get it done.
I don't know of any high hp motors with any head work other than springs, fire rings, and maybe valves.

 

Haha yea steve you wish you had an auto till it blows then you would be wanting the 5 speed again lol Im just waiting for mine to blow. I have a hard time keeping my foot out of it lol These injectors with php tunes are awsome no complaints at all. Cant wait to get my pump from joey this week because i set the check engine light pretty easy.

 

Okay, I was away for a coupla days and went and read more. That's always a good thing. My experience of PnP is from the motorcycle world. It looks like it's far easier to do there. I used to get airflow gains over 30% on some of the worst cast heads. The best factory head I saw was only a 7% gain after the PnP.

The take I have now is that a port and polish still helps, but the gains are dependent on the person doing the job and will still only amount to a small percentage gain. I have not been able to find hard numbers anywhere. The only numbers I could find were 4-5psi drop in turbo boost needed. This is a good thing, since you are making the same power with less boost. But it still only sounds like a 10% airflow increase or less (WAG).

Nothing that I read steered me away from the presence of a turbo making any bit of difference about a PnP being any less significant. It might alter the shapes of things somewhat, but either forced or drawn, air still has to flow. Just don't ruin the swirl.

Doing the PnP on the PSD is a tough job. Primarily access, the cast material being so tough to work with, and the risk of boring through to the other side like you guys mentioned. There are folks out there with CNC machines to do much of the work, but you'd still need to follow up by hand.

So, I would not remove the heads to do this work, but if I had my heads off, I would probably do some port cleanup myself. Nothing too serious with the snazzy valve job. Doing the work would save the overall expense of a PnP job.

Who makes headers for these things? Does anyone have any experience with them? I'll go read more.

 

ss or ceramic coated
7.3l Tubular Manifolds
i dont know anyone who has em though