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these motors confuse me sohc single over head cam but i guess that means per head well what gain would you see with two cams
. I'm new to car usually don't work on the engines
With what you have, stage 1 cams are for you. 15-20 hp I'd think.
To get the most potential, I'd do headers, 70 or 75mm tb/plenum, then heads and cams. It's got to breathe better to get the full potential from it. Even if you don't want better heads, the headers and tb/plenum will let the cams perform better.
Personally, I plan to do headers, heads, and cams all at once with a tune. That has to be easier than piecing it together.