My buddy has a 1991 CRX with the ls engine, and he is gonna send the head out for head work. Quick question 1. What is the most hp gain he can get from head work? Now who do u guys reccomend for rebuilding the hear? I think hes wantning to run like 13's so what every mods u guys would also reccomend. Thanks again

 

For 13s keep the head stock and boost it. Low 13s EASILY.