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Old 08-10-2012, 09:41 AM   #1
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Port and polish

Ive heard that just by porting and polishing the engine you can gain a decent amount of power, is this true and if so does anyone know how much it might cost for a 4.0
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Old 08-10-2012, 10:50 AM   #2
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Re: Port and polish

VERY COSTLY , Labor to tare the engine down is costly ,
and machine shops vary , there's really know way to give you a $$$ figure
that's something you have done while the engine's being built . its not cost effective to tear the engine down just to do it
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Old 08-10-2012, 11:00 AM   #3
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Quote:
Originally Posted by stampde
VERY COSTLY , Labor to tare the engine down is costly ,
and machine shops vary , there's really know way to give you a $$$ figure
that's something you have done while the engine's being built . its not cost effective to tear the engine down just to do it
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Old 08-10-2012, 11:30 AM   #4
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Re: Port and polish

Stampde is right, it is extremely costly and varies from shop to shop, but if you ever plan to do major performance mods to your car (TC or SC) it is best if you have them.
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Old 08-10-2012, 12:26 PM   #5
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Re: Port and polish

You don't actually port and polish the engine, rather you do components like intake and heads.

With the plastic intake though there really isn't anything to port and polish on that.

On the heads, there are some gains to be realized with a port and polish. The exhaust ports themselves are a restriction because they don't match up to the headers/exhaust manifold. There is quite a bit of overlap in just that spot. And the intake side can benefit from some port matching as well as improved flow.

I was quoted $1500 when I was thinking of doing a build on my old 4.0 for the head port and polishing. That didn't include changing the valves. Going with a bigger and lighter valve would add at least $500 on top.

But you need to find a good machine shop who knows how to port heads. Otherwise you could end up with some very expensive boat anchors when they finish.
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Old 08-10-2012, 12:34 PM   #6
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Quote:
Originally Posted by Barnyard4572
Ive heard that just by porting and polishing the engine you can gain a decent amount of power, is this true and if so does anyone know how much it might cost for a 4.0
Its about the same to buy a set already ported and polished
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