Right now it is a stock motor. What I am going to ad is a lt4 hot cam kit { cam roller rockers, etc. } and some long tube headers. The hp is 300 now . I am looking for 400- 425 when I am done. The heads are aluminum stock heads. I will need to add a better spring and a few other things. I would have whoever does the porting do this. I would supply the parts since they come with the kit.