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BlueBayou
Dodge Dakota
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11/15/2001
17:22:06

Subject: Port and polish
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Has anybody ported and polished the heads on a 4.7? What was the net gain in HP?

What about the intake. Could the intake be ported and/or polished?

Just curious ;)

Blue



CW
GenIII
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11/15/2001
19:24:03

RE: Port and polish
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I had some gain by porting the lip off of the throttle body, gave some torque and throttle respose.

2001 4.7 5sp RC 3.91 sport plus

Dakaty
Dodge Dakota


11/15/2001
20:52:49

RE: Port and polish
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CW

I noticed my intake manifold opening had some "rough edges" right at the mating surface of the TB. I thought about grinding it to make a more clear opening. I didn't want to remove the manifold from the engine as it was such a big job. I was trying to come up with different ways to trap the trash that would result from the grinding operation. I thought about using masking tape inside the manifold opening and a bunch of other HS (horse sheit) ideas.

How did you "port" yours?

Thanks for the reply

Bill




CW
GenIII
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11/15/2001
21:04:23

RE: Port and polish
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I ported the lip on the opening before the throttle blade on the throttle body it's self just removed the throttle body and took a demel tool to it. I made the opening of the throttle body the same size as the throttle blade. I didn't see any restriction on my intake though. Good and cheap mod, until I can afford the 70mm TB.

2001 4.7 5sp RC 3.91 sport plus

Horbedarn
*GenIII*
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11/15/2001
21:58:55

RE: Port and polish
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I don't know of an intake manifold or a cam for the 4.7 yet. You can get the heads ported at KRC Performance for $400. I think that will give you about 30 HP. I don't remember for sure. It has been a while since I talked to them.

2000, CC, SLT, 4x4, 4.7, 3.55, Auto
Borla Cat-Back, JBA Headers, 72mm TB, 4" Z-Tube
3923's, 180 T-Stat, IAT Adjuster

Fillupd
Dodge Dakota


11/15/2001
22:02:17

RE: Port and polish
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Did this simple operation extend you noticable results in performance? After the dremel tool, do you polish it with something to smooth up the edges, I guess emery cloth comes to mind. I would like to try this. Is it worth the efforts?

2001 SLT 4.7 4x4
Homebrew intake



CW
GenIII
 User Profile


11/15/2001
22:15:08

RE: Port and polish
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I think it is worth the effort. No dyno runs or 1/4 mile times but makes the truck feel better part throttle, still getting used to full throttle. Just got it a month ago.

2001 4.7 5sp RC 3.91 sport plus

BlueBayou
Dodge Dakota
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11/16/2001
10:18:22

RE: Port and polish
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Horbendarn - Where is KRC performance, and did they take the heads off and reinstall for 400?

Do you know anybody that had this done? Is it safe and still under warrenty?

30 Horses for 400 bucks aint to shabby.

I'm sure it would be even more with a 70mm!! hehehe

blue



Horbedarn
*GenIII*
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11/18/2001
20:26:11

RE: Port and polish
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There website is http://www.krcperformance.com/. I haven't done it myself or know anyone who has done it but I have called them about doing it. You have to take off your heads and send the heads to them. They charge $400 just to port and polish. You have to get them taken off you engine yourself. For the money you gain a lot of power compared to most other mods now.

2000, CC, SLT, 4x4, 4.7, 3.55, Auto
Borla Cat-Back, JBA Headers, 72mm TB, 4" Z-Tube
3923's, 180 T-Stat, IAT Adjuster

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