SquareBore to Spreadbore Adaptor Plate! (Is it Necessary?)

[savatreatabvr]

As you all know I have my share of issues with my mid 70's 454 so when I came across an almost new Edelbrock Performer 1407 carb for a great price I bought it on the spot! Of course I didn't flip it over to see if it was a spreadbore until the next day and of course it's not! Can I bolt a squarebore carb to a spreadbore intake without an adaptor and make it run right?

[GM-power]

Without an adapter or squarebore intake it wont run right. I know people who don't even like the adapter ideas. I hope this answers your question.
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[frog210]

you have a aftermarket intake?
i bolted my eddy 1806 i think 650 cfm to a performer 2101 intake
it worked fine for me

[MalibuSSwagon]

I had an adapter on mine, I wouldn't recommend it, best bet would be a matching intake manifold.

[savatreatabvr]

I used an adaptor on my 440 Moho and it worked great! As far as I know the only difference is the size of the back two barrels, right?

[88Jimmy4x4]

Just buy the adaptor

[Keith Seymore]

Originally Posted by savatreatabvr

I used an adaptor on my 440 Moho and it worked great! As far as I know the only difference is the size of the back two barrels, right?

Right.

I'm not morally opposed to a carb/intake adaptor.

I hop back and forth between a Dominator (for unlimited use) and a square flange Holley (for nostalgia classes) by using a Wilson adaptor.

My engine makes about 950 hp, car goes 9.80s at 3950 lbs.

Seems to work ok -

K

[savatreatabvr]

My application is more for street use, lol but I'll take ya'lls advice and buy an adaptor!

Originally Posted by Keith Seymore

Right.

I'm not morally opposed to a carb/intake adaptor.

I hop back and forth between a Dominator (for unlimited use) and a square flange Holley (for nostalgia classes) by using a Wilson adaptor.

My engine makes about 950 hp, car goes 9.80s at 3950 lbs.

Seems to work ok -

K

[INSIDIOUS '86]

Originally Posted by frog210

you have a aftermarket intake?
i bolted my eddy 1806 i think 650 cfm to a performer 2101 intake
it worked fine for me

An aftermarket intake would be a great way to wake up your truck beaver. I lil more money and time involved but shaving 50lbs and making more power is never a bad idea.
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[bigd65]

If you believe in the fuel velocity thing, you need to put the spacer on. With out it, can disrupt air flow because the walls won't be smooth all the way down the venturi's. I say that because some people don't believe in the air flow velocity thing even with a regular spacer on say a fuel injection and such. I do, I think the walls inside of the venturi's need to be smooth to keep the even fuel velocity
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[INSIDIOUS '86]

Originally Posted by bigd65

If you believe in the fuel velocity thing, you need to put the spacer on. With out it, can disrupt air flow because the walls won't be smooth all the way down the venturi's. I say that because some people don't believe in the air flow velocity thing even with a regular spacer on say a fuel injection and such. I do, I think the walls inside of the venturi's need to be smooth to keep the even fuel velocity
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That is with a normal spacer. This adapter actually kills velocity and creates turbulence and not in a good way
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[88Jimmy4x4]

Originally Posted by INSIDIOUS '86

That is with a normal spacer. This adapter actually kills velocity and creates turbulence and not in a good way
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I have heard you say this a couple times, do you have any proof or dyno sheets to back this up?....just curious

[savatreatabvr]

I kinda believes it all needs to be smooth but proof is best!

Originally Posted by 88Jimmy4x4

I have heard you say this a couple times, do you have any proof or dyno sheets to back this up?....just curious

[INSIDIOUS '86]

Originally Posted by 88Jimmy4x4

I have heard you say this a couple times, do you have any proof or dyno sheets to back this up?....just curious

I had a carb spacer test saved on my computer but the computer is no longer... And I can't find the article again. But take a look and tell me how bending the air almost 80* right as it exits the carb isn't going to be detrimental?

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[savatreatabvr]

This is the Mr. Gasket Squarebore to Spreadbore intake manifold adapter I was talking about! It only makes sense to me if it's installed upside down! I think I need your's INCIDIOUS '86!

[88Jimmy4x4]

Originally Posted by INSIDIOUS '86

I had a carb spacer test saved on my computer but the computer is no longer... And I can't find the article again. But take a look and tell me how bending the air almost 80* right as it exits the carb isn't going to be detrimental?

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never seen one like that, Im referring to the all open adaptor spacer, dont see how that can be as bad as you make it out to be.

[BigBlocksRule]

savatreatabvr, (didn't get that until I tried to say it!), I think I have one of the open Q-jet to square bore adapters, it's yours for shipping if you want to give it a try.

[88Jimmy4x4]

Originally Posted by INSIDIOUS '86

I had a carb spacer test saved on my computer but the computer is no longer... And I can't find the article again. But take a look and tell me how bending the air almost 80* right as it exits the carb isn't going to be detrimental?

who makes that?....ones I see on summitracing and jegs are open plate designs so there is no "bending" of the air as you claim that one has.

[savatreatabvr]

Mr. Gasket from Checker Auto Parts!

Originally Posted by 88Jimmy4x4

who makes that?....ones I see on summitracing and jegs are open plate designs so there is no "bending" of the air as you claim that one has.

[savatreatabvr]

I'll try anything at this point!

Originally Posted by BigBlocksRule

savatreatabvr, (didn't get that until I tried to say it!), I think I have one of the open Q-jet to square bore adapters, it's yours for shipping if you want to give it a try.

[savatreatabvr]

Like I said in my first post, is a Squarebore to Spreadbore adapter necessary? I do believe bolting a Squarebore carb to a Spreadbore intake can disrupt the air flow and hurt performance but I'm not running a 9 second car, I'm driving an old high mileage big block! I'm going to bolt it on and see what happens, I'll keep you all posted!

[i8tokyo]

Is it a stock, cast-iron intake? If so, you'll need the adapter. Since it's an edelbrock carb you really should use the ported style adapter. Edelbrocks PN is 2696.

[savatreatabvr]

Yes it's stock and yes I know I need the #2696 but here's what I was told about the 2696! Lopers, (a High Performance Shop here in Phx) said the Edelbrock 2696 Squarebore to Spreadbore adapters have a tendency to crack and cause minor to severe vacuum leaks! I didn't know if I should believe him or punch him, lol, so I walked away empty handed! Ya know a big block aluminum squarebore intake manifold doesn't sound like a bad idea now, Lol!

Originally Posted by i8tokyo

Is it a stock, cast-iron intake? If so, you'll need the adapter. Since it's an edelbrock carb you really should use the ported style adapter. Edelbrocks PN is 2696.

[INSIDIOUS '86]

Originally Posted by savatreatabvr

Like I said in my first post, is a Squarebore to Spreadbore adapter necessary? I do believe bolting a Squarebore carb to a Spreadbore intake can disrupt the air flow and hurt performance but I'm not running a 9 second car, I'm driving an old high mileage big block! I'm going to bolt it on and see what happens, I'll keep you all posted!

The spacer is there to make sure that the gaskets seal correctly. And the bolt pattern matches between carbs
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[savatreatabvr]

Yes it's stock and yes I know I need the #2696 but here's what I was told about the 2696! Lopers, (a High Performance Shop here in Phx) said the Edelbrock 2696 Squarebore to Spreadbore adapters have a tendency to crack and cause minor to severe vacuum leaks! I didn't know if I should believe him or punch him, lol, so I walked away empty handed! Ya know a big block aluminum squarebore intake manifold doesn't sound like a bad idea now, Lol!

Originally Posted by i8tokyo

Is it a stock, cast-iron intake? If so, you'll need the adapter. Since it's an edelbrock carb you really should use the ported style adapter. Edelbrocks PN is 2696.