How much flow does a multi ange valve job add (on average). I have these heads that have been ported and flowed around 235 at .600 lift with regular valves. I then got a multi angle valve job done and had the exhaust ports coated.I was wondering about how much flow I should be at for tuning purposes.

I don't know of any place to get them flowed around here, which is why I am asking for a estimate.

Thanks

Joe

 

235CFM isn't much to write home about. Who ported them? I would guess the port stalled out long before .600. Whats it flow at .500 and .550?

A good valve job and performance backcut valves can add flow. I would guess about 5%+/- or so.

 

I bought the heads off the forum already ported. I got them with upgraded springs and a CC305 cam for $600. I know that they don't flow as much as Lloyd's heads, but I didn't have $1200 to spend either. I'm sure that 235 + aprox. 5% will far out perform 180 CFM stock heads.

The heads did have aproximately the same flow at .550 and a little less at .500.

Besides, I was under the impression that, with a power adder (such as nitrous), the heads didn't need to flow as much because the power adder was doing the work.

I forget the numbers, but the exhaust side flowed very well, which I also was also informed that was good for heads ported with the intention of using a power adder.

Let me know if I am wrong on this, I am getting a little confused.

Thanks

Joe