The big issue is that, like dynos, every flow bench reads a bit differently. Even on the same flow-bench, setup can vary quite a bit as well and skew numbers. Some use a pipe for their exhaust numbers (not PRC) and that will boost the exhaust numbers tremendously. We had a friend at another shop do a test with exhaust pipe on the bench and the numbers kept getting better and better when he added length to the pipe....he ran out of pipe and space before the exhaust flow numbers stopped climbing.

But yes, it is difficult to just look at flow numbers and make a decision. There's much more to it than just flow.....think of a garden hose vs a fire hose. You get TONS more water (air) through the larger hose which is like big flow numbers, but without the right nozzle on the end the fire hose just dumps the water out and it doesn't go far....that's somewhat like airflow velocity being affected by port size. You ultimately need the velocity to make the big power, which is a combination of more air flowing through a smaller port (over simplified no doubt) kind of like putting your thumb over the end of the garden hose and getting the velocity up!

So there's really not a concrete way to tell which is best by flow bench numbers alone. I wish there was, because it would make consumer's "jobs" much easier and less stressful!

 

PRC Stage 2.5 5.3l heads. I want a set so bad! When I decide to get a cam or rebuild my valvetrain I will be looking for a set of these.

 

man...cant decidie on heads to buy...
narrowed it down to these 2

PRC stg 2.5 5.3 heads or the TEA stg 1.5 5.3 heads.

The TEAs flow a ridiculous cfm on the exhaust side. Flow the same on intake as the PRCs. But 260cfm on the exhaust!!

 

Ive got a set of PRC 2.5 5.3s Im going to throw up in the classifieds tomorrow, Ill let em go without springs for 900 if youre interested shoot me a PM.

 

call u tomm Cody. thanks again man!

 

Be sure to check what pipe (size and length) they use for those exhaust flow numbers. The advertised PRC numbers are NO PIPE on the exhaust. You can add more and more pipe to it and those numbers keep going higher and higher! Without the pipes, I'd expect the exhaust numbers to be very close as well

 

getn the PRC 5.3 stg 2.5s!!!!!!