Piker Porting (Intake Manifolds)

Rat Bastid said
Here’s an interesting thing. Every time I tried a burr finish it lost flow on my bench. Drove me nuts. Finally I decided way too many smart guys were saying burr finish, burr finish, burr finish. So I had to swallow my pride and figure out how to do it. Now I don’t finish any other way.

Sometimes a flow bench can tell you bad information. Another example of that is on the exhaust port. The bench will tell you to make the port bigger and bigger and it rewards you with a nice, big flow number. The problem is that big port just killed a ton of power. The bench wants a big exhaust port. The engines wants a small, fast and quiet exhaust port.

Even the EFI guys are using a burr finish from the valve seat to 3 inches above the injector. Reversion is real and the burr finish above the injector helps reclaim (for lack of a better term) some of the fuel that gets blown back up the runner by reversion.

The flow bench never tells you to make the exhaust bigger I don't know where you get this from. Blanket statements can be most sabotaging.
If you open 360 exhaust port up bigger and bigger...you can expect the low sub.450 flow to drop and see peaks move well into .700 lift. Using a 360 head...In many cases theres not enough throat/material to support the air at the turn, once the roof moves up enough... that's where the air goes and youll lose the ssr flow after .300..dead floor. A casting booger can be the root of higher lift stability in 'some' ports. Seen it myself.
Rough promotes a boundary layer and fuels reanimation with moving air. Does it effect speed, yes.
If it's all from reading books they don't need somebody to read a book and interpret it for them they can go read that same book and **** it up all on their own.
And this new attitude that if you don't have a flow bench you can't share well lets tuck our tail between our legs then:rolleyes: