The use of carb spacers on a Carb Style Single Plane EFI Intake

Is there any value in using a carb spacer a carb style single plane port EFI intake? Particularly when using with a 4 barrel TB? You know the popular ones like the "Super Sucker" and the 1" to 3" phenolic plastic ones. Some with four holes under the TB openings or some just open space.

I know they suppose to aid in increasing the air velocity and increase the vacuum signal in carb applications but would they help us in port EFI applications??

I think of using them on a carb style single plane on intake a 396 cu LT1.

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Originally Posted by B'klyn9C1

Is there any value in using a carb spacer a carb style single plane port EFI intake? Particularly when using with a 4 barrel TB? You know the popular ones like the "Super Sucker" and the 1" to 3" phenolic plastic ones. Some with four holes under the TB openings or some just open space.

I know they suppose to aid in increasing the air velocity and increase the vacuum signal in carb applications but would they help us in port EFI applications??

I think of using them on a carb style single plane on intake a 396 cu LT1.

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I think it helps a little. May add a little torque and aids in filling the runners more efficient with more plenum volume. I ran one underneath my elbow on my last setup. I am running a nitrous plate under my 4-hole throttle body now.

There's one way to find out, lol. Take it to the track along with some tools and make some consistent passes and then let us know. Some cars may pick up, others may not notice at all. Some of the spacers can help the manifold to better distribute air. EVERY good engine dyno room will have several spacers on hand to try them out on the fly to see if it helps out or not. You better have a cowl hood on your car though.

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Originally Posted by joelster

There's one way to find out, lol. Take it to the track along with some tools and make some consistent passes and then let us know. Some cars may pick up, others may not notice at all. Some of the spacers can help the manifold to better distribute air. EVERY good engine dyno room will have several spacers on hand to try them out on the fly to see if it helps out or not. You better have a cowl hood on your car though.

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Joelster, I hear you about the cowl hood but thank God the '91-'96 B-Body has a lot more room under the hood than you poor guys with 4th Gen F-Bodies.

I reason is why I am inquiring is that I want to put on of these carb style single plane EFI manifolds with a 4BBL TB on a built 396 ci LTx stroker. Why would I want to do that in light of the fact that most of these setups are on generally max effort/track only cars and not on daily drivers which my car is.

Well I have been talking to some of the 3rd Gen F-Body guys on other forums and one in particularly, zz17iroc has this setup on his built 383 L98 stroker. He found not only was the cylinder to cylinder air distribution superior to the the TPIS Miniram, (which is virtually like our LTx intake manifold) that he had on the engine previously. But the 4BBL TB enhanced the highway cruise (the ability to loaf along at 45 MPH @ around 1500 RPMs with built 700R4), and the around town drivieabiltiy. Most of these 4BBL throttle bodies can be set so that for over 60% of the pedal distance you are only using two of the throttle openings. Good way of keeping the air velocity up in part throttle situations.