Anyone know what the lift ratio of the rocker arms are on the spi, also what material they are made of? Trying to learn if its possible to just add higher ratio arms or if there is more required to it.
The odd setup there has rockers with no pushrod socket in them, rather, a flat for the lifter to push on. Since any swap would most likely be another type of rocker off another engine then you usually need that flat and others don't have it.
F'instance, we used to put Ford V-8 460 rockers on Tempo 2.3 fours as the setup worked well there if you picked correct pushrod length. A useful boost in lift there.
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