Square bore carb on a spread bore intake??
04-20-2005, 11:45 AM
#1
Square bore carb on a spread bore intake??
Are there any drawbacks running a square bore carb on a spread bore intake?
Im running a holley 750vs #3310 on this intake. I have the egr and choke provisions blocked off and using a square bore carb gasket.
Im running a holley 750vs #3310 on this intake. I have the egr and choke provisions blocked off and using a square bore carb gasket.
04-20-2005, 01:23 PM
#2
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Car: '82 Camaro
Engine: 383
Transmission: TH-350
It usually is no problem. On some spreadbore intakes you can get a vacuum leak at the base since the intake carb opening gets larger at the rear. On my Edelbrock Performer RPM Q-Jet manifold with a 3310 on top, I run a metal plate Edelbrock sells in between the carb and manifold to be safe. If you have enough room a small spacer would work too. But for that Weiand intake, I don't know if you would have any problems though.
HTH
HTH
04-20-2005, 01:42 PM
#3
Originally posted by Bunker82
It usually is no problem. On some spreadbore intakes you can get a vacuum leak at the base since the intake carb opening gets larger at the rear. On my Edelbrock Performer RPM Q-Jet manifold with a 3310 on top, I run a metal plate Edelbrock sells in between the carb and manifold to be safe. If you have enough room a small spacer would work too. But for that Weiand intake, I don't know if you would have any problems though.
HTH
It usually is no problem. On some spreadbore intakes you can get a vacuum leak at the base since the intake carb opening gets larger at the rear. On my Edelbrock Performer RPM Q-Jet manifold with a 3310 on top, I run a metal plate Edelbrock sells in between the carb and manifold to be safe. If you have enough room a small spacer would work too. But for that Weiand intake, I don't know if you would have any problems though.
HTH
04-20-2005, 02:11 PM
#4
Supreme Member
What Bunker said. You need that metal plate with (thin) gaskets on either side of it so you don't have any vacuum leaks.
People run Holley (squarebore) carbs on top of bellybutton-common Edlbrock Performer intakes (spreadbore) all the time and it work just fine. It'll work fine on your intake, too.
Thin spreadbore gasket on bottom + plate + thin squarebore gasket on top is still a pretty compact package- maybe 3/16" thick for the whole shootin' match.
People run Holley (squarebore) carbs on top of bellybutton-common Edlbrock Performer intakes (spreadbore) all the time and it work just fine. It'll work fine on your intake, too.
Thin spreadbore gasket on bottom + plate + thin squarebore gasket on top is still a pretty compact package- maybe 3/16" thick for the whole shootin' match.
04-20-2005, 02:44 PM
#5
Originally posted by Damon
What Bunker said. You need that metal plate with (thin) gaskets on either side of it so you don't have any vacuum leaks.
People run Holley (squarebore) carbs on top of bellybutton-common Edlbrock Performer intakes (spreadbore) all the time and it work just fine. It'll work fine on your intake, too.
Thin spreadbore gasket on bottom + plate + thin squarebore gasket on top is still a pretty compact package- maybe 3/16" thick for the whole shootin' match.
What Bunker said. You need that metal plate with (thin) gaskets on either side of it so you don't have any vacuum leaks.
People run Holley (squarebore) carbs on top of bellybutton-common Edlbrock Performer intakes (spreadbore) all the time and it work just fine. It'll work fine on your intake, too.
Thin spreadbore gasket on bottom + plate + thin squarebore gasket on top is still a pretty compact package- maybe 3/16" thick for the whole shootin' match.
Does this gaskets and plate come all together, or do I just buy one of each?
I do have one of the wire wove carb gaskets and just a paper gasket between the carb and intake. I might have to see what the local speed shop has in stock.
04-20-2005, 03:12 PM
#6
Supreme Member
Without the "plate" there will be gaps where there is nothing to compress ("sandwich") the gasket and prevent a vacuum leak (especially around the secondary side of the carb just in front of the hold-down bolts). The plate is, in my opinion, mandatory.
If you've got vacuum leaks due to not using this plate it won't run right- especially at idle and light throttle. Once you get up around WOT it will usually run pretty good.
I don't recall if the plate comes with the gaskets or not- I don't think it does. But you already have a squarebore gasket under the carb, I assume, so all you need to get is an open-hole spreadbore gasket and you'll be good to go.
If you've got vacuum leaks due to not using this plate it won't run right- especially at idle and light throttle. Once you get up around WOT it will usually run pretty good.
I don't recall if the plate comes with the gaskets or not- I don't think it does. But you already have a squarebore gasket under the carb, I assume, so all you need to get is an open-hole spreadbore gasket and you'll be good to go.
04-21-2005, 09:28 AM
#7
Originally posted by Damon
Without the "plate" there will be gaps where there is nothing to compress ("sandwich") the gasket and prevent a vacuum leak (especially around the secondary side of the carb just in front of the hold-down bolts). The plate is, in my opinion, mandatory.
If you've got vacuum leaks due to not using this plate it won't run right- especially at idle and light throttle. Once you get up around WOT it will usually run pretty good.
I don't recall if the plate comes with the gaskets or not- I don't think it does. But you already have a squarebore gasket under the carb, I assume, so all you need to get is an open-hole spreadbore gasket and you'll be good to go.
Without the "plate" there will be gaps where there is nothing to compress ("sandwich") the gasket and prevent a vacuum leak (especially around the secondary side of the carb just in front of the hold-down bolts). The plate is, in my opinion, mandatory.
If you've got vacuum leaks due to not using this plate it won't run right- especially at idle and light throttle. Once you get up around WOT it will usually run pretty good.
I don't recall if the plate comes with the gaskets or not- I don't think it does. But you already have a squarebore gasket under the carb, I assume, so all you need to get is an open-hole spreadbore gasket and you'll be good to go.
Thanks guys, I didnt know that it was required. I did question if it would seal when I bought the intake. It was like new and it was almost $200 new and I got it for $75.
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