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Nissan SR20DET Notch TopPhoto 4/12
| 3. Notch Top
The first generation Flat Top cylinder head (1) can be distinguished from the second generation (2) by the cooling fins at the front of the head. The Notch Top (3) had the VTC cam gear that protrudes from the front.
Nissan SR20DET notch top intake portsPhoto 8/12
| The Flat Top cylinder head features a cast in, "high angle" intake port. By comparison, the notch top features a more traditional looking low port design.
Nissan SR20DET Rocker Arm StoppersPhoto 9/12
| The sheet metal rocker arm stoppers that bolt onto the cam caps help to keep the rocker arms from being flung from their positions under the cam lobes at high engine speeds.