What air cleaner will fit?
I have a 1963 corvette with a 327 and a replacement intake manifold.
It has a stock hood. Does anyone know what Air Cleaner will fit under the hood? Replacement aftermarket air cleaner such as MR. Gasket or something from summit Racing???? It has a 4BBL Holley Carb 650cfm. Pictures and or part numbers or spec. on hood clearance would be helpful. Thank You! |
You can start by telling us the make and model intake and carb
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Originally Posted by Nowhere Man
(Post 1594532189)
You can start by telling us the make and model intake and carb
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Originally Posted by PPCPete
(Post 1594531953)
I have a 1963 corvette with a 327 and a replacement intake manifold.
It has a stock hood. Does anyone know what Air Cleaner will fit under the hood? Replacement aftermarket air cleaner such as MR. Gasket or something from summit Racing???? It has a 4BBL Holley Carb 650cfm. Pictures and or part numbers or spec. on hood clearance would be helpful. Thank You! Must use a 3 inch high or 2/12 high available from KandN ( filter) Fred g |
65+ factory drop base fits fine.
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Originally Posted by PPCPete
(Post 1594531953)
I have a 1963 corvette with a 327 and a replacement intake manifold.
It has a stock hood. Does anyone know what Air Cleaner will fit under the hood? Replacement aftermarket air cleaner such as MR. Gasket or something from summit Racing???? It has a 4BBL Holley Carb 650cfm. Pictures and or part numbers or spec. on hood clearance would be helpful. Thank You! Fredski |
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No matter what you cobble together check the hood clearance yourself before buying off on the changes. Tin foil and painter's tape work well.
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Originally Posted by Frankie the Fink
(Post 1594575790)
No matter what you cobble together check the hood clearance yourself before buying off on the changes. Tin foil and painter's tape work well.
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Originally Posted by Frankie the Fink
(Post 1594575790)
No matter what you cobble together check the hood clearance yourself before buying off on the changes. Tin foil and painter's tape work well.
The closest point of contact is at 2:00 position if you look at the air cleaner lid from the back of the car, or through the windshield. The "tin" foil balls should be positioned across and slightly ahead of the centerline, not fore-aft. |
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Originally Posted by 65tripleblack
(Post 1594576336)
No good.
The closest point of contact is at 2:00 position if you look at the air cleaner lid from the back of the car, or through the windshield. The "tin" foil balls should be positioned across and slightly ahead of the centerline, not fore-aft. This is correct. The photo below shows the closest contact point for the stock C2 air cleaner and hood. At first I was surprised that this happens on only one side, but the reason is that the entire engine is offset about one inch toward the passenger side. |
Originally Posted by GearheadJoe
(Post 1594578017)
This is correct. The photo below shows the closest contact point for the stock C2 air cleaner and hood.
At first I was surprised that this happens on only one side, but the reason is that the entire engine is offset about one inch toward the passenger side. Im well aware of the "touch points" on these cars, chiefly at the rear of the PS dual snorkel extension tube when you try to put heat insulators under the carb. |
1 Attachment(s)
Originally Posted by GearheadJoe
(Post 1594578017)
This is correct. The photo below shows the closest contact point for the stock C2 air cleaner and hood.
At first I was surprised that this happens on only one side, but the reason is that the entire engine is offset about one inch toward the passenger side. I found another photo that shows the corresponding location of the interference (indicated by the blue tape) on the 1967 air cleaner. It is possible that earlier C2 air cleaners would have issues in other locations, but on my '67 this is the place where the air cleaner comes closest to the hood. On a stock L79 with the L79 intake and 3810 Holley carb, the hood clearance is about 3/8" to 1/2". The OEM '66-'67 Corvette air cleaner assembly is a "drop-down" unit that is intended to provide good hood clearance. If you assemble the top and bottom sheet metal parts off the car, you will see that there is a pretty small gap (about one inch) between the lid and the opening for the carburetor throat, so this is close to becoming an air restriction. Some aftermarket drop-down air cleaners gain additional hood clearance by further reducing this gap. It would be a good idea to check this gap prior to installing an aftermarket drop-down air cleaner. There's no sense choking the air flow to the carb just to get some extra hood clearance. |
Originally Posted by Frankie the Fink
(Post 1594578094)
It was an EXAMPLE folks. I defend your right to put your balls anywhere you like.
Im well aware of the "touch points" on these cars, chiefly at the rear of the PS dual snorkel extension tube when you try to put heat insulators under the carb. |
Originally Posted by GearheadJoe
(Post 1594578572)
I found another photo that shows the corresponding location of the interference (indicated by the blue tape) on the 1967 air cleaner. It is possible that earlier C2 air cleaners would have issues in other locations, but on my '67 this is the place where the air cleaner comes closest to the hood. On a stock L79 with the L79 intake and 3810 Holley carb, the hood clearance is about 3/8" to 1/2".
The OEM '66-'67 Corvette air cleaner assembly is a "drop-down" unit that is intended to provide good hood clearance. If you assemble the top and bottom sheet metal parts off the car, you will see that there is a pretty small gap (about one inch) between the lid and the opening for the carburetor throat, so this is close to becoming an air restriction. Some aftermarket drop-down air cleaners gain additional hood clearance by further reducing this gap. It would be a good idea to check this gap prior to installing an aftermarket drop-down air cleaner. There's no sense choking the air flow to the carb just to get some extra hood clearance. You may already know this, but there is a limit to how much drop can be designed into an air cleaner before air flow problems negate the effects of a larger air cleaner height. The culprits are the vent stacks, and if they are less than about 3/8" below the underside of the lid, then float bowl reference pressures are affected and starvation problems can develop at high airflow rates. Doesn't matter much whether the tubes are angle cut or not. |
Originally Posted by 65tripleblack
(Post 1594584524)
Hi Joe,
You may already know this, but there is a limit to how much drop can be designed into an air cleaner before air flow problems negate the effects of a larger air cleaner height. The culprits are the vent stacks, and if they are less than about 3/8" below the underside of the lid, then float bowl reference pressures are affected and starvation problems can develop at high airflow rates. Doesn't matter much whether the tubes are angle cut or not. Hi Joe: Thanks, I did not know that was another limiting factor with drop-down air cleaners. My guess is that the stock C2 air cleaner probably pushes this parameter to the limit as well. I recall talking to a guy who did a chassis dyno test on a car that had an extreme version of a drop-down air cleaner. Simply removing the air cleaner lid added about 25 HP. I suppose that the difference could be due to restriction in the air cleaner element, but I bet most of it was due to the low height of the lid. |
Originally Posted by GearheadJoe
(Post 1594585241)
Hi Joe:
Thanks, I did not know that was another limiting factor with drop-down air cleaners. My guess is that the stock C2 air cleaner probably pushes this parameter to the limit as well. I recall talking to a guy who did a chassis dyno test on a car that had an extreme version of a drop-down air cleaner. Simply removing the air cleaner lid added about 25 HP. I suppose that the difference could be due to restriction in the air cleaner element, but I bet most of it was due to the low height of the lid. That would be my guess as well; his A/F might have gone lean for the reason mentioned. I did cut about 1/4" off the vent stacks on my QF carb to obtain the minimum 3/8" clearance! I would say that hif filter was not a new one, or was restricted in some other way. Was it a 14" x 3" paper element as stock 1966 up SBC? I modeled my engine as is (14 x 3) vs 14 x 4 using EA Pro 3.5 and produced a negligible difference across the board. The difference obtained by cold air induction (no ram effect) was dramatic, as I fully expected.. |
Originally Posted by GearheadJoe
(Post 1594585241)
Hi Joe:
Thanks, I did not know that was another limiting factor with drop-down air cleaners. My guess is that the stock C2 air cleaner probably pushes this parameter to the limit as well. I recall talking to a guy who did a chassis dyno test on a car that had an extreme version of a drop-down air cleaner. Simply removing the air cleaner lid added about 25 HP. I suppose that the difference could be due to restriction in the air cleaner element, but I bet most of it was due to the low height of the lid. That would be my guess as well; I did cut about 1/4" off the vent stacks on my QF carb to obtain the minimum 3/8" clearance. I would say that his filter was not a new one, or was restricted in some other way. Was it a 14" x 3" paper element as stock 1966 up SBC? Check his A/F ratio plot if he has one. Possible the mixture might have gone leaner than it normally does on the top end due to this exact phenomenon and/or dirty filter. Our friend the Duck recommends Baldwin filters. I modeled my engine as is (14 x 3) vs 14 x 4 using EA Pro 3.5 and produced a negligible difference across the board. The difference obtained by cold air induction (no ram effect) was dramatic. |
Originally Posted by 65tripleblack
(Post 1594585792)
That would be my guess as well; his A/F might have gone lean for the reason mentioned. I did cut about 1/4" off the vent stacks on my QF carb to obtain the minimum 3/8" clearance!
I would say that hif filter was not a new one, or was restricted in some other way. Was it a 14" x 3" paper element as stock 1966 up SBC? I modeled my engine as is (14 x 3) vs 14 x 4 using EA Pro 3.5 and produced a negligible difference across the board. The difference obtained by cold air induction (no ram effect) was dramatic, as I fully expected.. The story about the 25 HP loss was just something a guy mentioned to me in conversation, so I don't know the specifics of the air cleaner that was involved. I do recall that he was convinced that the problem was a very small clearance between the lid and base of the air cleaner. It was an aftermarket dropped-base air cleaner that had probably been optimized for a low height, without regard to possible consequences of dropping the lid too far. |
Originally Posted by GearheadJoe
(Post 1594586263)
The story about the 25 HP loss was just something a guy mentioned to me in conversation, so I don't know the specifics of the air cleaner that was involved. I do recall that he was convinced that the problem was a very small clearance between the lid and base of the air cleaner. It was an aftermarket dropped-base air cleaner that had probably been optimized for a low height, without regard to possible consequences of dropping the lid too far.
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Originally Posted by GearheadJoe
(Post 1594578017)
This is correct. The photo below shows the closest contact point for the stock C2 air cleaner and hood.
At first I was surprised that this happens on only one side, but the reason is that the entire engine is offset about one inch toward the passenger side. |
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