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The exhaust ports have the same sort of treatment as the intake ports. The valve seating surface width is slightly wider at 1.2 mm to improve valve cooling.
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Like the intake the exhaust has more material removed at the roof and has the port splitter moved back. You can clearly see how the bowl area is opened up leading into the port.
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The sides of the valve bucket hole have to be milled out to clear the high lift TRD cam lobes.
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You can see how the cut outs work to clear the cam lobes here.
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The assembled head with the TRD big valves.
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Although the 4AG has passed as an ultimate performance engine long ago, it still enjoys a lot of popularity among Toyota lovers and Technosquare can build a mean one or anything in-between for the discerning Toyota aficionado.
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