[Matt Meaney]

i'm cutting down part of the center divider, to clear the throttle blade of a holley 3 bbl. so far, it's been marked off and a notch has been roughed in. since the top of the notch will now see some air/fuel flow, i'm wonder how to finish it off. i would think, it should be at least rounded. maybe a little knife edged would be good (don't want it too thin and risk it flaking). maybe it doesn't matter and leaving it square is ok. is there a preferred shape when doing this mod?

[shaker455]

Matt,
Oddly enough I posted an RPM mod I did years ago.
Yes you can bring your edges to a point or knife edge to do what you need.
When I 1st got my 3-bbl its was lean on sec side so I suggest to use an O2 sensor wideband for tuning
Jeff

[78w72]

here is how SD does the notch, rounded off knife edge.

pic is playing with cutting open a 4 hole gasket.

[Matt Meaney]

i'll go ahead and copy the sd style of notch and thanks for the extra info on the carb. that will help in the long run.

[Juliano]

I used a thicker carb gasket and cut out the middle divider between the secondaries

[Matt Meaney]

this is the finished version of my center divider. it ended up being a little more involved than i originally planned. i intended the notch to be just enough to clear the throttle plate. when i put the carb on and opened the secondary up, you could see plenty of the flat carb flange/center divider. you could even see some of the divider through the primaries. it probably would have been just fine that way, but i couldn't leave well enough alone. the center divider was narrowed between the primaries. the notch for the secondary was lengthened (didn't make it any deeper) and blended as best i could. for better or worse, at least it lets the secondary open.
https://www.youtube.com/watch?v=bc_c23dqAKk

[turbo69bird]

Most aerodynamic shape is a rain drop so that should help. Although Wilson intakes used to rough the bottom and lower sides of intake runners to keep air /fuel in suspension w turbulence. Am which is probably why they waffled the bottom of that intake like that. So sometimes aerodynamics isn’t what you want Best is testing look at those 4 hole spacers they used w the long angles openings under the carbs forget what they were called . Some carb shim style locates had something similar for reversion./ pulses under w jets https://www.motortrend.com/how-to/pi...t-performance/

[Half-Inch Stud]

Fun fact; the real shape of a raindrop is not a smooth stretched spheroid. Rather is a 3-D ink blot.

Otherwise, the cartoon raindrop is a rather good aero shape.