oh, i thought the black top had a better bottom end aswell. thought it was stronger aswell as better length con rods an better sized bores which makes it more responsive to tuning but dont take my word for it as i aint researched it and the info i have is second, third or maybe even fourth hand.

still, cant be a bad combination and atleast the standard conversion is cheap as chips

it only gets expensive when doin charging or throttle bodies as need aftermarket managment aswell