J Jessie james New Member Jun 25, 2017 2 0 1 Sacramento Jun 25, 2017 #1 Jun 25, 2017 #1 So i got a 1990 5.0 Ho. mustang gt convertible.i just got some aluminum GT40 heads for it and i was wondering what ratio rocks and cam i should go with to get the most hp but still keep it smog legal in cali?don't really know what im doing at all..
So i got a 1990 5.0 Ho. mustang gt convertible.i just got some aluminum GT40 heads for it and i was wondering what ratio rocks and cam i should go with to get the most hp but still keep it smog legal in cali?don't really know what im doing at all..