I don't know if this has been asked yet but how fast do you go with trick flow 240's ?

PRH said

“Generally”, when talking about exactly the same head, then yes.
But...... not necessarily.

Depends on where the extra cc’s come from, which may or may not result in a change to the minimum CSA(cross sectional area).

For example, if you’re working on a head where the min CSA is the pushrod pinch, and you do some porting everywhere else in the port....... but leave the pinch area untouched....... you have increased the “volume”(cc’s), but you have not increased the minimum CSA.

Click to expand...

Ah, good explanation. So theres still a choke point. I have a fuel injected 5.9 magnum in a 99 r/t dakota I put engine quest heads on before I knew much of anything I went hog wild with my carbide, going at it from the bowl area & port side I think I gained 3/8th on cross section pulling from both sides of the pinch, what I did made it so the tires blow off consistently at 3800 rpm, for a street truck I think what I did was slowed the velocity down & now I get near 7 mpg city. (If that makes any sense) does that sound right? Too big of port for the application