i have a 90 hf...and i was wonderin if i coud put a si throttle body on there?........and a si head.....how much more power am i lookin at there too....thnx

 

unless you put the whole si intake manifold on, the throttle body wouldn't do much as the hf intake manifold is alot smaller than the si intake manifold. If you were to swap on the si intake manifold and TB along with the head you should see a few hp there for sure.

 

pm'd you

 

haha dont put an Si head on your HF motor u will bend your valves the instant u crank it. the hf is an 8V motor the pistons are designed for 8 valves not 16.