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Jan 30, 2013 | 08:56 PM

#16

JJray

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Ok cool ill look into all this stuff. Is it a bad choice for 3 angle valve seat grind?

Jan 30, 2013 | 09:00 PM

#17

Gary Lewis

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From: Northeast, OK

3-angle is good.

Jan 30, 2013 | 09:05 PM

#18

JJray

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Alright. Whats this emissions thing you guys are talking about grinding out?

Jan 30, 2013 | 09:25 PM

#19

85lebaront2

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From: Exmore, VA

Right here in the exhaust ports.

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Jan 30, 2013 | 09:34 PM

#20

Gary Lewis

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From: Northeast, OK

And, from a different angle, the hole Bill circled is the end of the channel that the upper red line runs through. The hole in his picture is the bottom end of that drilled passage.

Jan 30, 2013 | 09:37 PM

#21

Gary Lewis

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From: Northeast, OK

And here's Bill's view with the bump ground out:

Jan 30, 2013 | 10:13 PM

#22

JJray

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Is there any special tools or tricks to grinding that out? Does ever exhaust port have that?

Jan 30, 2013 | 10:25 PM

#23

Gary Lewis

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From: Northeast, OK

The trick is to not go too far as there is a water passage behind it. But there is a LOT of metal there so it isn't likely you will strike water. As said, use a die grinder and a carbide burr. And, oddly enough, most of the heads I've checked had the bump in three of four ports. The one without the bump is the crossover port where exhaust goes through the intake for heating.

But, if you start with a better head there won't be as much of a bump.

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Jan 30, 2013 | 10:29 PM

#24

JJray

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Is there anyway to plug the passage that heats the intake? Or is that a needed passage?

Jan 31, 2013 | 07:41 AM

#25

Gary Lewis

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From: Northeast, OK

There are gasket sets that plug that passage. But, I wouldn't do it as it really is beneficial in cooler weather.

Jan 31, 2013 | 04:27 PM

#26

JJray

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Got ya. Is there any machine work to help the intake?

Jan 31, 2013 | 04:40 PM

#27

Gary Lewis

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From: Northeast, OK

Port matching is all, and there are some that say you actually want the intake's ports to be smaller than those in the head to prevent reversion, meaning backflow.