Porshe 914 heads will fit on the VW type 4 motor. Compared with VW type 1 heads, you can see that there are quite a few more cooling fins. Note the factory breather tubes. The intake ports have a nice straight path to the intake valve. These ports have been opened up to 38 mm diameter. This is a little bit odd due to the 48 mm valve and the 44 mm diameter of the intake manifold where the carb. mounts.