3V cfm on big bore?

[tjm73]

Has anybody seen or tested ported heads on a big bore 3V? I'm curious what the larger bore does to flow numbers. BBR CNC heads, for example, flow around 290cfm onthe stock valve sizes. Their website doesn't say but I assume this is on a stock or near stock bore of 3.55".

How much does it increase in a 3.7" bore? 5%? 10%? More? Less?

 

[RED09GT]

That is a complaint I have about the flow numbers posed by just about everyone selling ported 3V heads is that they don't specify the bore size used when testing.

 

[3vs197]

im betting its with a stock bore size, that would make the most sense.

 

[05mustang_TT_charged]

Livernois test results were with a 3.55" Bore. I have talked with them about this also and I haven't seen where they posted with a Big Bore setup.

 

[1/4MILEMUSTANG]

I havent tested this on a 3v head but when I was testing my afr heads on a 4.040 bore compared to a 4.155 bore they only picked up a little over 11 cfm. I thought the calibration on my flow bench was off cause i was expecting more so i recalibrated the bench and it actually came out to be 10 cfm after. lol, i guess I shouldnt have recalibrated it! i even spoke with AFR about it and they said 7 cfm is what they figured i would see. I'm getting ready to do a new set of heads for my 06 and can do the test and post the results up but it will be a few weeks before I can get started on them.