4 replies to this topic

[dattoman]

More info on the rest of the engine inc cam specs

I desktop dyno'd 12 sets of alloy heads recently before I bought mine
Brodix ones didn't rate very well...... but they don't seem to be the ones you bought

[V-SLR5000-P]

Brodix heads are good quality, but more information is required to evaluate the test results you have, such as, what pressure drop was used in the testing?, was there a pipe installed on the exhaust port? There are also differences between individual flow benches which further confuse the issue. If your heads have 220cc ports l wonder if they are either Track 1�s, 11X or 1X, as all these Brodix heads have intake volumes around 220cc.
What your flow sheet shows is that intake flow virtually stalls at around .550 lift with little improvement above this level. Anyway, there is little point bolting on a pair of heads with phenomenal flow at .660 lift if your cam only has a maximum valve lift of .500. So, for practical purposes you can forget about flow figures beyond your cam lift. Also exhaust flow is a little weak dropping below 70% of inlet flow above .400 lift. Ideally exhaust flow should be around 75% of inlet flow for maximum power.
220cc intake ports are generally too large for most small blocks under 400ci unless for racing purposes. Your decision to run these heads should be based on your engine specs and intended use rather than the flow figures alone.