Building A Nissan KA24DE Motor - Tech Knowledge
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The real focus of the porting is at the merge, throat, and valve pocket. If you closely examine the stock KA24 head, you'll see that there's quite a bit of material that can be cut out at the merge between the two exhaust passages. To a lesser degree, the merge on the intake side is narrowed. Cutting away at this material will open up the passage, increasing the capacity of air that can be exhaled out of the engine. The valve pocket was raised on both sides to increase the capacity of the port. The ramp was left relatively unchanged on either side. Special attention was given to the tiny exhaust ports--a handicap for the KA24DE engine. View Related Article
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