i have a 1990 prelude si 4ws and the motor it has is a b20a and i was wonderin if the middle rocker arm on the vtecs would fit in the place of the stock ones to give it hopfully more accel..would it work??  

the vtec arms are machined to fit together. if your talking about putting vtec arms on/in a ls head no it wont work. if the head on your b20 is already vtec as long as the arms are from the b-series vtec head yes they will fit but should be mic'ed to assure propper fittment.  

i was thinkin about takin the arms out of a h22 but if i can find a b series vtec then ill take the arms out of it..