Edelbrock RPM smooth out Bowls

[moparspares]

Hi Folks

My first time anyone near a head with a die grinder. I gasket matched head and was working on smoothing out the cast marks in the the bowls. Didnt want to port because of my inexperience and dont want to F#*K it up. I did however take a little material off below the valve seat to smooth out the ridge. My question is how smooth do I need to make it. As you can see it's still a little rough.

 

[txstang84]

Maybe I can't see them, but the work you've done actually looks pretty good-to me. Unless I'm mistaken, the casting line on the left side of the bowl in the picture kinda looks like it could use a small bit of touch up, but again, I can't really tell.

 

[C130 Chief]

That's fine. A super smooth intake surface flows the same as a reasonably smooth surface. So unless you just have buckets of time to kill, don't go too nuts.

 

[moper]

Stop! you don't want to smooth out that angle below the seat. Otherwise - looks good.

 

[moparspares]

Stop! you don't want to smooth out that angle below the seat. Otherwise - looks good.

Moper

Not an expert on porting by any means but what would smoothing the ridge down below the seat do?. Educate me please.

I took very little from it. The casting was really rough in those spots and I thought It would help. I have read other articles on porting and some say smooth these right out to blend in with the bowls below.

 

[famous bob]

Moper

Not an expert on porting by any means but what would smoothing the ridge down below the seat do?. Educate me please.

I took very little from it. The casting was really rough in those spots and I thought It would help. I have read other articles on porting and some say smooth these right out to blend in with the bowls below.

think he means, don`t take the bottom angle of the valve job off, it`s there for a reason.-------bob

 

[RustyRatRod]

think he means, don`t take the bottom angle of the valve job off, it`s there for a reason.-------bob

^^^^^ Exactly. There's actually a recommendation for the percentage difference between the valve diameter and the valve bowl throat area. Something like the bowl is not supposed to exceed say 75% of the valve diameter. I just used 75% as an example. I don't know if that's right, but there is a percentage that is recommended not to exceed. I just forget at the moment exactly what it is.