Strip Dominator - Spread bore weld up

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Ivoryk3ys78

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I was interesting in having the spread bore opening converted to a true square bore on my Strip Dominator that is on my trick flow headed 409. I was reading about doing it with epoxy or welding. I don't really think I have the skills for it.

Does anyone know if there is a plate that fits down in and fills that area? I read on here somewhere that someone was making them at some point.

Any idea what someone would charge to do this? I am pretty close to Portland Oregon. Might pickup a Track Heat when they come out but I'd like to give the best I can with the strip Dominator. Whoever had it before me loos like they gasket matched it nicely ( to my untrained bad eyes). I have 800cfm on it on top of a 1" HVH super sucker 4 hole blended to open spacer.

Thanks
 
RustyRatRod said:
Just use this.

Edelbrock 2732 Edelbrock Carburetor Adapters | Summit Racing

I see zero advantage to filling it in with welding or epoxy......other than ruining a good intake.
Click to expand...

Couldn't the flow get messed up having to go down and around that spread bore area instead of straight down the plenum? some air stopped up and possibly fuel falling out of suspension?

Are you saying I should use that adapter underneath the HVH super sucker I have bolted straight to the manifold? If so could you help me understand why since the manifold has both bolt patterns already.

Thanks a lot
 
Ivoryk3ys78 said:
Couldn't the flow get messed up having to go down and around that spread bore area instead of straight down the plenum? some air stopped up and possibly fuel falling out of suspension?

Are you saying I should use that adapter underneath the HVH super sucker I have bolted straight to the manifold? If so could you help me understand why since the manifold has both bolt patterns already.

Thanks a lot
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It seals up the spread bore part of the manifold. Most square bore gaskets, plates and adapters don't do that. And no, it won't affect flow in the least. Air flow follows the path of least resistance. You're saying the air will will flow into the intake, make a 90 degree AROUND the plate and somehow cause turbulance? Think about that. Real hard.
 
Ivoryk3ys78 said:
Couldn't the flow get messed up having to go down and around that spread bore area instead of straight down the plenum? some air stopped up and possibly fuel falling out of suspension?
Click to expand...
I don’t know where your getting your thoughts from but that is some truly weird science going on right there I tell ya. In short = NO. It is literally the same if the intake was already a square bore if you use what Rusty gave a link to or the spacer right on the intake or the carb right on the intake. FWIW, the plenum of a single plane intake is a chaotic place where you will find no repeatable pattern to the air and fuel flow even though the firing order never changes.

The Holley works very good on the manifold as is. The time and effort to make it a square bore could result in 5-10 possibly more HP on big power builds.
After you epoxy it square, you would still have a lot of plenum work to perform since the spreadbore pattern covers a lot of area under the carb in the plenum area.
If your looking for a square bore intake, start with a Victor.

Are you saying I should use that adapter underneath the HVH super sucker I have bolted straight to the manifold? If so could you help me understand why since the manifold has both bolt patterns already.

Thanks a lot
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Yes you should use it if the super sucker has an air leak due to not being able to cover and seal on the spread bore intake. But we both know that is not the case.

The intake was designed long ago to run the stock TQ carb to meet certain racing rules of, “Must run the stock carb.” Of course, a Holley was used for every other class.

FWIW…..
Since the MoPar M1 is an updated copy, the only mods to the manifold are floor damns. The same MAY work for the Holley. (IF! Even needed.) If you ignore the floor damns, go straight to porting the intake, then you’ll have to flow test it for finding out the balance between runners. Or just slam it on and go.
 
Ivoryk3ys78 said:
I was interesting in having the spread bore opening converted to a true square bore on my Strip Dominator that is on my trick flow headed 409. I was reading about doing it with epoxy or welding. I don't really think I have the skills for it.

Does anyone know if there is a plate that fits down in and fills that area? I read on here somewhere that someone was making them at some point.

Any idea what someone would charge to do this? I am pretty close to Portland Oregon. Might pickup a Track Heat when they come out but I'd like to give the best I can with the strip Dominator. Whoever had it before me loos like they gasket matched it nicely ( to my untrained bad eyes). I have 800cfm on it on top of a 1" HVH super sucker 4 hole blended to open spacer.

Thanks
Click to expand...

If you want to do something you can order a Magnafuel 5006 and take the rubber gasket and lay it on the top of the intake. Grind your manifold to those lines and run it. I would sell that HVH super sucker. I’ve only seen that spacer do anything once, and it was on an oddball engine that had some other issues.
 
Spacers are a crap shoot, I can't tell you how many times I've either changed mine out or taken it out all together.
 
Hughes used to offer that operation on M1 manifolds(they still might).

One time I had a customers 452RB on the dyno and he had two of the M1’s to try.
One that was stock, the other had been welded up and blended to make it a regular square bore flange.
This was about a 600hp build.
The welded/blended one was worth about 4-5hp.
Both intakes were port matched.
 
PRH said:
Hughes used to offer that operation on M1 manifolds(they still might).

One time I had a customers 452RB on the dyno and he had two of the M1’s to try.
One that was stock, the other had been welded up and blended to make it a regular square bore flange.
This was about a 600hp build.
The welded/blended one was worth about 4-5hp.
Both intakes were port matched.
Click to expand...
like i said it aint worth it
 
To each his own. a bunch of work for very little gain.
I'd try a spacer , it could be worth an extra 5- 10 HP or not.
 
Wow that's really cool. Some nice back to back testing there.

PRH said:
Hughes used to offer that operation on M1 manifolds(they still might).

One time I had a customers 452RB on the dyno and he had two of the M1’s to try.
One that was stock, the other had been welded up and blended to make it a regular square bore flange.
This was about a 600hp build.
The welded/blended one was worth about 4-5hp.
Both intakes were port matched.
Click to expand...
 
If "whatever" spacer will work and seal without that plate I linked to, that's what I'd do and not look back. I just don't think hackin on the intake will really get you much and it may end up costing.
 
I do understand that spacers are a crap shoot. I have seen dyno testing posted on hughes website as well as on I think it was a 408 Ford stroker on Engine masters where they used a 4 hole merged to open spacer with good results. I have read that those can often do well on a single plane. I do understand it is combination specific but I am pretty confident it didn't hurt me and I bought it pretty cheap used on ebay.

I was basing what I was thinking on welding up the Strip Dominator based on some older posts on this forum that talk about it being something you want to do and that there was definitely a gain there. After the responses in this thread certainly sounds like it's not worth the trouble.

I appreciate the feedback.
 
Yeah it seems to seal up well. Car runs great. Had a couple runs this summer at it 95.75 in the 1/8 and 118.6 in the 1/4 full steel 72 Duster with 727/Hughes 3500/4.10/28. 408 800cfm DP, Strip Dom, Trickflow, Howard 254/260 600/615 Solid 11.2Cr. I would like some more carb but it was a 650 proform I had and had upgraded the main body to bring it to 800.


RustyRatRod said:
If "whatever" spacer will work and seal without that plate I linked to, that's what I'd do and not look back. I just don't think hackin on the intake will really get you much and it may end up costing.
Click to expand...
 
rumblefish360 said:
Sorry, what makes you think I was talking to you?
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I didn’t. I just pointed out I don’t really care for 4 hole to open tapered spacers. In my at the track testing the antireversion plates almost always went quicker and I never had one slow down. But the manifold has to be opened up to make sure it doesn’t cover any of the groove around the outside. If you don’t open up the plenum to uncover that groove it will go slower. I have no idea of the science behind it, I just know they work.
 
FWIW, when my engine (Indy single plane) was on the dyno the super sucker equaled out the afr’s on each bank. They were off by 1 to 1 1/2 points without it. Another benefit was the extra 13 up it picked up.
 
justinp61 said:
FWIW, when my engine (Indy single plane) was on the dyno the super sucker equaled out the afr’s on each bank. They were off by 1 to 1 1/2 points without it. Another benefit was the extra 13 up it picked up.
Click to expand...
they're supposed to reduce turbulence right under the carb by smoothing the transition from 4 holes ending at 90 degrees to the open manifold below.
 
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