Intake Manifold Height

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May 22, 2008 | 09:24 PM

65tripleblack

Thread Starter

Safety Car

Joined: May 2003

Posts: 4,797

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From: Ocean Township NJ

Intake Manifold Height

I have the L76 aluminum intake manifold height as: 3.75" front, and 4.75 rear.
What are the corresponding heights of a LT1/Z28 intake?
My hood is in the paint shop, so I need an answer to the following question:
What is the clearance under a smallblock hood for a stock L76 intake, 2818 carb, and stock air cleaner.
How much clearance will be left (if any) if I replace the 461 stock manifold with a Z28 (3972116), with stock 2818 carb and air cleaner?

Thanks in advance.

Joe

May 22, 2008 | 09:39 PM

Nowhere Man

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From: Sitting in his Nowhere land Hanover Pa

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if its a 327 block you will have to reconfigure the PCV. it the L79 intake would would be a good choice

May 22, 2008 | 09:45 PM

dmentzer

Racer

Joined: Aug 2005

Posts: 355

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From: Ephrata PA

I have a 66 and with the L79 intake, Holley, and stock 66 air cleaner, (which is different than yours if you are using the stock 65 air cleaner) I have about 1/2" to 3/4" clearance with the hood.

May 22, 2008 | 11:03 PM

66since71

Melting Slicks

Joined: Jun 2006

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From: DFW

GMPP says the LT-1 is "about 1/2 inch" higher than the ZZ4 manifold. The ZZ4 they list as 3.50" and 4.63".

Harry

May 23, 2008 | 01:39 AM

Michael H

Racer

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From: North Richland Hills TX

Not sure what the height difference is in your carb and a Holley, but I have a 116 manifold and Holley 4777 650Double Pumper on my 63 with stock hood. Very little clearance, but it fits using a 66-67 style air cleaner w/ Fram A212 Air filter. I'd fit it on your car, as body mounts, motor mounts all factor it (again, its REAL close).

-mph

May 23, 2008 | 08:39 AM

65tripleblack

Thread Starter

Safety Car

Joined: May 2003

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From: Ocean Township NJ

Quote:

Originally Posted by Michael H

Michael,

That's a lot like what I want to do. My carb is a stock Holley 2818, 585CFM single feed, model 4150. I'm running a 30-30 cam, and I'm looking to go with a 750 CFM Holley dual feed with vac secondaries. I just bought a 116 intake. I should have my hood back by early June.
Do you know if the dimensions of a 750 vac secondary are same as your 4777?
What do you use your car for, with that big cam in it? Not street, right? Your rear gear is 4.56 or higher?

Joe

Last edited by 65tripleblack; May 23, 2008 at 10:24 AM.

May 26, 2008 | 02:11 PM

OCS1667

Burning Brakes

Joined: Jun 2004

Posts: 1,123

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From: Sandia Park NM

I read about a trick to see if the air cleaner is a good fit.

Place some silly putty or something similar at different locations on the top surface of the air cleaner. Close the hood and determine if there are indications of the hood hitting the putty. This should give you a clear picture of what's going on.

Dennis