i have an obd2 valve cover and i also have an obd2 ls head. i am going to turbo a b18a1 engine in a week but i have obd2 ls parts and i want the newer valve cover on the older head. also why does the older ls have less horesepower than the newer ls, is it because of the head?
or is it in the block. cause if swapping the heads will give me the 12 ponies ill do it. by the way im mating this to a hydraulic gsr tranny. any help appreciated thanks.