L88 hood
Team Owner
Joined: Jun 2001
Posts: 23,376
Likes: 1,067
From: Virginia USA
Pro
Joined: Jun 2014
Posts: 705
Likes: 96
From: Ventura County CA
Here is what the repro, LT1, L88, L79 air cleaner base looks like. Its a true 2" drop and clears everything on the carb.
Here it is with the factory style lid with the recessed wing nut bubble. Shown with a 3" element.
You really need to have the choke tower removed off of the carb (or use a HP style main body) with this setup....It does clear the vent tubes with about 1/2" of clearance but doesn't cause any running issues.
This is the lowest air cleaner setup you can get that, will still allow a 3" element and not require the bubble lid like the Speedway/Afco....
That said, this air cleaner still kills about 10 rwhp on the chasis dyno on a 650 chp engine. I now run a 4" element and it only kills about 3 rwhp....
The base alone is so good, it makes more power then with nothing at all on the carb. I actually race it with just the base only on it.
Here it is with the factory style lid with the recessed wing nut bubble. Shown with a 3" element.
You really need to have the choke tower removed off of the carb (or use a HP style main body) with this setup....It does clear the vent tubes with about 1/2" of clearance but doesn't cause any running issues.
This is the lowest air cleaner setup you can get that, will still allow a 3" element and not require the bubble lid like the Speedway/Afco....
That said, this air cleaner still kills about 10 rwhp on the chasis dyno on a 650 chp engine. I now run a 4" element and it only kills about 3 rwhp....
The base alone is so good, it makes more power then with nothing at all on the carb. I actually race it with just the base only on it.
does not leave much clearance between the lid and the bottom, what about 1"?
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
Without the bubble top, the LT-1 2" drop base almost squashes a 3" element......you really need a 4" element with it......and then you lose some clearance advantage. The bubble top type drop bases were designed more for the ram effect of air rounding the bubble down into the carb. The drop clearance is an added bonus. I've found a 5 hp increase on the engine dyno with the AFCO type vs. the flat type........with both big and small block engines.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
Like Ken mentioned, the lid sits down close to the carb throat with a 3" element, it is definitely a restriction if you are making over 500hp.... This is the factory style configuration.
On my car, running this setup, lost 12 rwhp. Going to a 4" element gained 9 rwhp of that back.
Obviously though, you will not have room for a 4" filter under the hood.
For a basic street car with say 500hp or less, the LT1 air cleaner is the best option for fitment under a hood.
The reality is, even an L88 hood is a restriction... I chasis dynoed my car with the air cleaner lid/filter off, only the base on...hood open... Then close the hood and make a pull and it would lose 3 rwhp.... I tested this twice.. Carbs do not like having anything sitting directly above them.
Pro
Joined: Jun 2014
Posts: 705
Likes: 96
From: Ventura County CA
Here is a pic of the lid, this is with the 3" element
Like Ken mentioned, the lid sits down close to the carb throat with a 3" element, it is definitely a restriction if you are making over 500hp.... This is the factory style configuration.
On my car, running this setup, lost 12 rwhp. Going to a 4" element gained 9 rwhp of that back.
Obviously though, you will not have room for a 4" filter under the hood.
For a basic street car with say 500hp or less, the LT1 air cleaner is the best option for fitment under a hood.
The reality is, even an L88 hood is a restriction... I chasis dynoed my car with the air cleaner lid/filter off, only the base on...hood open... Then close the hood and make a pull and it would lose 3 rwhp.... I tested this twice.. Carbs do not like having anything sitting directly above them.
Like Ken mentioned, the lid sits down close to the carb throat with a 3" element, it is definitely a restriction if you are making over 500hp.... This is the factory style configuration.
On my car, running this setup, lost 12 rwhp. Going to a 4" element gained 9 rwhp of that back.
Obviously though, you will not have room for a 4" filter under the hood.
For a basic street car with say 500hp or less, the LT1 air cleaner is the best option for fitment under a hood.
The reality is, even an L88 hood is a restriction... I chasis dynoed my car with the air cleaner lid/filter off, only the base on...hood open... Then close the hood and make a pull and it would lose 3 rwhp.... I tested this twice.. Carbs do not like having anything sitting directly above them.
I ordered the LT1/L88 drop base and it will be here on Wednesday. We will see what happens then.
Thanks for all your help and endless measurements
A few less horses won't bother me as this is only a street cruiser.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
I cut 1/4 inch off the base is have now and that brought the top of the air cleaner down to 4". Only problem is it is rocking and not fully seated due to hitting the float adjusters on the 4150.
I ordered the LT1/L88 drop base and it will be here on Wednesday. We will see what happens then.
Thanks for all your help and endless measurements
A few less horses won't bother me as this is only a street cruiser.
I ordered the LT1/L88 drop base and it will be here on Wednesday. We will see what happens then.
Thanks for all your help and endless measurements
A few less horses won't bother me as this is only a street cruiser.
Safety Car
Joined: Oct 2004
Posts: 3,926
Likes: 739
From: Youngstown Ohio
I cut 1/4 inch off the base is have now and that brought the top of the air cleaner down to 4". Only problem is it is rocking and not fully seated due to hitting the float adjusters on the 4150.
I ordered the LT1/L88 drop base and it will be here on Wednesday. We will see what happens then.
Thanks for all your help and endless measurements
A few less horses won't bother me as this is only a street cruiser.
I ordered the LT1/L88 drop base and it will be here on Wednesday. We will see what happens then.
Thanks for all your help and endless measurements
A few less horses won't bother me as this is only a street cruiser.
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Team Owner
Joined: Jun 2001
Posts: 23,376
Likes: 1,067
From: Virginia USA
I ran into the same issue: I know that my aftermarket manifold and air cleaner will not fit under a stock hood.
You mentioned having a bodyshop glass in a hood scoop. I am currently modifying my stock hood for a stinger style scoop simply because I really like the look
I don't have any finished pictures yet since I just started this project two days ago but it really is not terribly difficult. Here is my progress so far
Marking for the cutout.
The hole
Scoop bonded to the hood.
I chose to go with a lower profile scoop which is giving me approximately 2.5" of extra clearance. It is raining today so I will not be doing any fiberglass work but as soon as it dries up I will be finishing the underside with fiberglass and then blending the scoop into the hood for a seamless look.
You mentioned having a bodyshop glass in a hood scoop. I am currently modifying my stock hood for a stinger style scoop simply because I really like the look
I don't have any finished pictures yet since I just started this project two days ago but it really is not terribly difficult. Here is my progress so far
Marking for the cutout.
The hole
Scoop bonded to the hood.
I chose to go with a lower profile scoop which is giving me approximately 2.5" of extra clearance. It is raining today so I will not be doing any fiberglass work but as soon as it dries up I will be finishing the underside with fiberglass and then blending the scoop into the hood for a seamless look.
Team Owner
Joined: Jun 2001
Posts: 23,376
Likes: 1,067
From: Virginia USA
Bashcraft - that looks great. Exactly what I'm going to do someday. Thanks for the picture. I think that I'll move the stinger back a little to get the cowl induction effect. How far does the rear of the stinger go back on your mod?
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
It's back as far as it can go without the wiper door hitting it when it opens.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
When I put the 406 back in I had to get an L-88 hood to clear the Team G intake, 1/2" spacer and flat base air cleaner as I cannot run a drop base with my regulator setup. I went with ACI after much research. If you call them and said you saw it on E-bay they knock $100 off. The hood was $569 and $140 to ship about 2 years ago.
It fit extremely well out of the box but like most aftermarket C3 hoods....the front needs to be knock down along the front or peak or else it will look like it is duck billing.......
I also had to buy the air chamber from Ecklers.....why does ACI not produce the airbox is still a mystery.....
Anyway.....my friend installed the airbox and epoxied fence wire along the back edge of the scoop to give this area support as they sag over time here. It was finished off and you cannot tell.....along with the airbox.....its looks like it was made that way.
I love the hood......I do not love the 4" one.....it looks a little bulbous to me.....the factory L-88 hood is the standard of scoops in my opinion and it was designed 50 years ago!
Have Fun,
Jebby
It fit extremely well out of the box but like most aftermarket C3 hoods....the front needs to be knock down along the front or peak or else it will look like it is duck billing.......
I also had to buy the air chamber from Ecklers.....why does ACI not produce the airbox is still a mystery.....
Anyway.....my friend installed the airbox and epoxied fence wire along the back edge of the scoop to give this area support as they sag over time here. It was finished off and you cannot tell.....along with the airbox.....its looks like it was made that way.
I love the hood......I do not love the 4" one.....it looks a little bulbous to me.....the factory L-88 hood is the standard of scoops in my opinion and it was designed 50 years ago!
Have Fun,
Jebby
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Burning Brakes
Joined: Apr 2020
Posts: 790
Likes: 419
From: Western NY