I had a post going awhile ago with before and after porting numbers on an old LD340. A member asked (I think it was mshred) if anyone did any testing with a small block Victor on a nice flowing Edelbrock head. Well a good Friend of mine needed a set of heads so I offered him an old set of open chamber heads (340 model). He not only wanted them ported but he also wanted to step up to a 2.08 valve. I had a set of valves sitting here for a set I wanted to do for myself for testing purposes so I opened he seats up and started porting. They are not done yet as I still need to slow down the airspeed some more but I wanted to see if the intake would solve my problem so I bolted my new Victor on and did a flow test. As expected the numbers were terrible so I laid out the intake today and went to town grinding. I ground on it for 1 1/2 hours doing one port and some plenum work. Did a quick test and then more grinding. Here are the before and after numbers. Please don't criticize to bad as I didn't really pretty it up yet.

head only-----stock Victor------ported Victor
.200--133--------129---------------132
.300--200--------182---------------191
.400--249--------225---------------236
.450--267--------244---------------249
.500--281--------255---------------269
.550--286--------257---------------273
.600--290--------259---------------276
.650--297--------259---------------285
.700--312--------263---------------300
.750--318--------269---------------305

I never expected numbers like this out of this head but it loved the 2.08 valve. I will still work on the airspeed some more before they are finished. I will post some before and after pictures on the unfinished intake.

Before porting











After porting

Is that a victor 340 and is that #5 hole you worked over? I basically did the same thing with mine, but didn't knife-edge the dividers quite as much. I straightened out the "belled in" area between the carb flange and the tops of the runner openings and gave them a little more raduis in to the runners. Mine also needed big work at the runner opening at the heads. Has anybody got any "turtle" info on these manifolds? Thinking of trying some?

Yes that's #5 on a Victor 340. I only knife edge the top but its kinda hard to see in my pictures. I have a Super Victor on my car right now and I had to do a lot more work to it than I did on the Victor. I did my heads in a hurry after my W2 cracked and if I remember right I got them up to 280cfm and thru them on to go racing.

I was asking about porting hurting or helping these manifolds over on fastmopar when I was looking at buying one that had a little bit of grinding on it.

Thanks for posting this though! I am thinking if I can actually learn a little bit about what to do and not to do that will help (especially in the plenum) then I may tackle it and hope it helps instead of hurts performance

Nice work,John! That looks like the inside of my RB Victor 440 intake...Jimmy did a great job on it!

The Victor has really 'chunky' runner dividers, you can open them up a ton. A runner should almost always flow at least a few % more than the port if max peak HP is the target (not necessarily for broadest torque though).

Don't neglect the runner roofs, I blend them deep beyond the plenum toward the port. On single planes with a conventional firing order 5 tends to steal from 7. And the longer the stroke (ie the smaller the runner cross section relative to the displacement) the more it tends to steal. I tend to mod the #7 roof so it's slightly taller at the corner of the wall it shares with #5, I call it "Gumby's head" Also keep in mind that #2 and #1 fire consecutively as well. Not so much an isue on the 340 Vic but moreso on pieces like the BB Holley Street Dominator.

Your not kidding about chunky runners. We are using a Victor on my sons car but the only thing he did to it was a gasket match and his 360 in his 3200# duster has gone 10.50's. After he sees this he may want to pull his and start grinding. I know on my application I will be using either a 1 inch spacer or a 4150-4500 adapter so that lets you get real creative.

That a 4150 intake,John? Wilson makes a nice 4500-4150 adapter but it is pretty pricey!

Funny!! Now....for a big block I may know of a pair of MW Victors...

Quote:

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Ted I have 2 sets of B1's, 2 sets of 440-1's, and 1 set of Stealths sitting here and here I am playing with this crap.

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You just blew the crap out of the being retired and broke theory!!

Emarine,

Can't really speak to porting a Small block M1, IMO very similar in concept/design to the Strip Dominator with maybe a slightly deeper plenum. Walls are far thinner (i.e., OOTB closer to full maximum width) than the Victor. I've only ever port matched and de-burred/smoothed the plenum transition on an M1...maybe because I didn't see too many places on it worth chasing HP.

I've ported several BB M1's but it's a different animal entirely.

THE SB M1 always worked well for me, I really like the agressive runner contour from the plenum to the port entry, maybe the best of all the standard port manifolds in that regard.

I would like to know more about the heads!!! Is it me or are those good numbers for iron 340 heads !!! What head? What kind of valve? What kind of port/ bowl work has been done to it! I know the 2.05 valve is used a lot but not many use the 2.08.

I can't even begin to tell you how many hours I have in these heads. This is my first time playing with a 2.08 valve in a set and so far I am real happy with the results. These are for a Friend but I ordered a new set of bare Edelbrock heads closed chamber (60769) during Summits sale and another set of 2.08 valves to do a set for myself. I know this head is capable of flow numbers over 325cfm but the chamber shape is a real issue. I have an old test head that I am going to play with first. I will tell you when you push this head for good numbers every port is on and off the flowbench many times. The stock flow numbers maxed out at 243cfm before I started grinding.
It helps to be retired and to enjoy this type of work. I crank up the stereo and pass the Winter away.