Guys I need some help. I have just completed porting out a set of ls 1 heads. Put them on my neighborhood machine shopflow bench equipped w pipe. At 300 they jump straight up to 260 cfm and slowly gained increased flow to 288 by 650.
I have never seen such an early ramp increase and am wondering what will be the outcome when they are bolted onto my motor.

Anyone ever run into this situation or have any ideas? Did I mess these heads up or are they going to work? Any comments good or bad are appreciated.

 

Well first it would be good to know what they flow say @ .100" and .200" lift . I'm assuming You're talking intake ports . Did You port the exhaust runners as well ?

 

Yes I did port the exhaust side as well. I will be at the machine shop tomorrow so I will pick up a flow chart for the heads and post.

 

Find out what bore they used