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Head Porting?????

lambokit

lambokit

New member
This may be a really dumb question. But I'm going to ask it anyway. I saw a porting job started by Swiff. He ported the center exhaust port and eveyone said he ruined the head because it flows better with the smaller "D" shape. But doesn't the volumetric efficiency go up opening up the exhaust port even if the flow goes down??? Since putting a set of Oval headers gives more horsepower, wouldn't opening the exhaust ports up to match the oval headers give even more volumetric efficiency even if the flow goes down??? Less backpressure!!! More Power??? Again I don't know this is why I'm asking...:th_scratchhead:
 
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The "D" shape helps with reverse exhaust pulses. If you open it up to match the gasket in a circle, you have just taken this feature out and while it might flow a tad more, it is negated by the fact that you are putting exhaust gases back into the cylinder before the exhaust valve closes. Kinda like an egr but unwanted lol.
 
Wow, that was fast. Thanks for the info. I have a friend with a race shop and a flow test machine. That's why I didn't under stand that it was ruining the head. It would have to get better flow. BUT yes it would remove all exhaust pulses. Thanks again. By the way your powder coating looks awesome. Did I read that you polish S/C cases???
 
Thanks, and no i dont polish i have attempted and its just not cost/time effective. I think with the right powder it looks just as good if not better, IMO.
 


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