'teen machine
Well-Known Member
Hello, I have my heads off right now and was wondering if I could grind off the egr bumps in the exhaust ports for more flow??? They're plugged now anyway
EGR holes on 318 heads
- Thread starter 'teen machine
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The bumps on the floor result in a near zero gain. It's not until you reshape the entire exhaust port that removing the the floor bump comes into play.
mopar340dave
Well-Known Member
By reshape you mean gasket match to the top and sides?
No. Though I like the idea of gasket matching 3 sides of the port to the gasket for high performance useage. I was meaning expanding the exhaust port beyond the gasket size for a full race porting. Closer to all out (race) for that head. (A 318 head)
This is a point where a 360 head should be considerd depending on useage.
This is a point where a 360 head should be considerd depending on useage.
mopar340dave
Well-Known Member
I have a factory roller 5.2 from an 85 New Yorker that I may turbo...
C130 Chief
Mechanical Genius
The bulk of the high velocity gasses travel along the roof of the port, so flow gains will mostly result from improving this area. The AIR (not EGR) ports were placed in an area of the port where there is little gas movement, making it easier to inject air under low pressure. When porting the heads, any bumps around the port should be blended flush, but beyond that don't sweat it too much. Focus on the massive step in the port roof, and the guide boss which are a far bigger impediment to flow.
Then when it comes time to porting the head and all that attention it should receive, I would talk to a pro porter for advice and tech.
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