Polishing intake on 4.0 - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 10-18-2011
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Polishing intake on 4.0

I got a 94 4.0 with custom exhaust, and intake. Now i was looking into polishing my intake manifold and head. has anyone tried this and what gain of power did u get.
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Old 10-18-2011
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I have not tried this on the 4.0, but in most cases the intake passages are best left as cast to retain some turbulence to keep the air-fuel mixed well. The point where performance can be gained is in matching the size and shape of the manifold-head juncture. Go ahead and polish the exhaust ports, but don't make the port too big or you will lose velocity.
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Old 10-18-2011
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Yeah thats one point that got brought up on Ford Enthusiasts, but one guy said u only had to worry about that on carbs were EFI dosnt mix in the intake manifold were carbs do.
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Old 10-18-2011
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Good point there, if you decide to go for it let us know the results.
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Old 10-18-2011
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I know 422 cam, p&p heads, and tune will get about 40rwhp.

Assuming you have flow to support it.
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Old 10-18-2011
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Yeah, but as i read on they say that porting with a ruffer grit it better, Like its better to port with a ruffer cut then a polish,, Theres so many opinions out there lol ill just have to keep reading and get more opinions
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Old 10-19-2011
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You polish the combustion chamber and the exhuast port, just open everything else up.


To get to the 40hp mark you need to do more than a gasket match. Porting is a skill at least if you plan to make horsepower it is. There is a reason places charge 1600 for a set or ported and polished heads.
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Old 10-19-2011
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Oh yeah thats another thing what about new gaskets. And yeah i can do, iv worked with metal for 10 years and got steady hands with a grinder. And im not goin to do a real big port
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Old 10-19-2011
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Quote:
Originally Posted by Dutter View Post
Oh yeah thats another thing what about new gaskets. And yeah i can do, iv worked with metal for 10 years and got steady hands with a grinder. And im not goin to do a real big port
You better off swapping a 5.0 and P&P those heads you'll gain more than a 4L you also can run a carb instead of EFI
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Old 10-19-2011
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Well hell yeah id love to do that, do i dont have the money for another motor.
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