1966-67, 1970-71 Air Cleaner Dimensions Needed

[Joe C.]

All,

If some of you wouldn't mind getting out your steel rules for a minute, I need your help.
Please give me the vertical dimensions from the air horn gasket flange to the bottom surface of the air filter. This dimension is familiar as the air cleaner "drop base" amount.
It would be helpful to me to know this dimension for the following, and I realize that some or all may be exactly the same:

1966-67 either L75 or L79
1966-67 BBC with 4bbl carb
1970-71 SBC with LT1

Thanks in advance,
Joe

[Terry M.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Joe,

I would be glad to get it for you from my 1970 LT1. Any suggestions how to get this measurement? If looks complicated to do accurately, and maybe even hard to get inaccurately.

[Joe C.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Joe,

I would be glad to get it for you from my 1970 LT1. Any suggestions how to get this measurement? If looks complicated to do accurately, and maybe even hard to get inaccurately.

Thanks Terry:

Remove the air cleaner and remove filter element. Flip the base upside-down on your table or bench, or on the unprotected hood of your beautiful Z06.

Put a straight edge across the flat base of the air cleaner (surface where the filter element sits in, and the side facing Heaven while upside down on your Z06's bonnet).

Measure down from the straight edge to the flange surface that seals to the air horn.

Thanks,
Joe

PS:
If you scratch the hood of your car while doing this, don't worry. Billy Mays (God rest his soul) hawks a product that will make it look better than new.

[Terry M.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

OK I can do it that way (not on the Z06 though -- the hood isn't flat enough ), but if I have this pictured right this measurement will include the thickness of the base material.

You know I had hopes once Billy Mays passed on we wouldn't be burdened with his shouting on TV. I think his commercials will live forever.

[Joe C.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

OK I can do it that way (not on the Z06 though -- the hood isn't flat enough ), but if I have this pictured right this measurement will include the thickness of the base material.

You know I had hopes once Billy Mays passed on we wouldn't be burdened with his shouting on TV. I think his commercials will live forever.

Correctamundo!
It's only thin sheetmetal, and this data is for Government use.

[Reba W.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

You know, Terry, I think the guy for the Slap Chop machine is about as bad as the late Billy.

[Terry M.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Isn't he the same guy who sells some absorbent towel that soaks up soda pop from rugs? SHAM WOW more like SCAM WOW Yea, I can't imagine anyone falls for that stuff, but they must or someone else would be hawking that trash.

[Terry M.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Well OK, if that is what you want -- I'll get it tonight.

[Joe L.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Thanks Terry:

Remove the air cleaner and remove filter element. Flip the base upside-down on your table or bench, or on the unprotected hood of your beautiful Z06.

Put a straight edge across the flat base of the air cleaner (surface where the filter element sits in, and the side facing Heaven while upside down on your Z06's bonnet).

Measure down from the straight edge to the flange surface that seals to the air horn.

Thanks,
Joe

PS:
If you scratch the hood of your car while doing this, don't worry. Billy Mays (God rest his soul) hawks a product that will make it look better than new.

Joe-----

Using the measurement protocol you described above, I measured an NOS GM #6422188 and found the measurement to be 2-1/32".

The GM #6422188 was used for the following applications:

1965-67 Corvette with 396 or 427 and 4BC

1970-72 Corvette with LT-1


1966-67 Corvette with 327 used a different base. It was GM #6422931. I don't have one of these to measure. However, I believe that all of these 66-72 drop-down bases were basically the same except for location/configuration of PCV tubes. They might not all measure EXACTLY the same with respect to the measurement you are interested in, though. That's because these things were not exactly a "precision stamping".

[Joe C.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Joe-----

Using the measurement protocol you described above, I measured an NOS GM #6422188 and found the measurement to be 2-1/32".

The GM #6422188 was used for the following applications:

1965-67 Corvette with 396 or 427 and 4BC

1970-72 Corvette with LT-1


1966-67 Corvette with 327 used a different base. It was GM #6422931. I don't have one of these to measure. However, I believe that all of these 66-72 drop-down bases were basically the same except for location/configuration of PCV tubes. They might not all measure EXACTLY the same with respect to the measurement you are interested in, though. That's because these things were not exactly a "precision stamping".

Thanks Joe,

That's exactly what I needed.

I agree that the 66-67 SBC is going to be the same "drop down" dimension as the BBC, but the only way to know for sure is if somebody provides it. All bases offered for sale at the popular Corvette parts houses look the same, except for the number and location(s) of AIR/breather tubes.

I am trying to determine what "drop down" dimension was used with SBC air cleaners in order to enable the use of the lower restriction 3" tall open element air cleaner to fit beneath the C2 SBC hood.

Once I confirm that the SBC dimension is 2" also, then I will look at an aftermarket "drop down" base of at least 2" which I will adapt for use with a 1966/67 style lid and filter element which will fit underneath my 1965 SBC hood.

The L76 engine will be equipped with a DZ Z28/70-72 LT1 intake manifold topped with a dual feed center hung float style 750 CFM Quick Fuel carburetor.

This will be a close shave, but it is likely that this setup will fit under the SBC hood without very much trouble. The LT1 is exactly 5/8" taller than the 461 intake from the L76, and fits under my hood if topped with the stock 2818 Holley and L76 air cleaner with 1" to spare at its CLOSEST interference point.

Joe

[Gerard F.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Thanks Joe,

That's exactly what I needed.

I agree that the 66-67 SBC is going to be the same "drop down" dimension as the BBC, but the only way to know for sure is if somebody provides it. All bases offered for sale at the popular Corvette parts houses look the same, except for the number and location(s) of AIR/breather tubes.

I am trying to determine what "drop down" dimension was used with SBC air cleaners in order to enable the use of the lower restriction 3" tall air filter element to fit beneath the C2 SBC hood.

Once I confirm that the SBC dimension is 2" also, then I will look at an aftermarket "drop down" base of at least 2" which I will adapt for use with a 1966/67 style lid and filter element which will fit underneath my 1965 SBC hood.

The L76 engine will be equipped with a DZ Z28/70-72 LT1 intake manifold topped with a dual feed center hung float style 750 CFM Quick Fuel carburetor.

This will be a close shave, but it is likely that this setup will fit under the SBC hood without very much trouble. The LT1 is exactly 5/8" taller than the 461 intake from the L76, and fits under my hood if topped with the stock 2818 Holley and L76 air cleaner with 1" to spare at its CLOSEST interference point.

Joe

Joe,

On my 67/327/300 the dropdown is 1-15/16" along the sides and back, add 1/32" in the front, but it is not 2" or over. Here's a pic:



Not sure about the part number, but guaranteed original to my 67.

BTW Still doing my penetance in house chores for going to the National
But I'm almost there to spend some time with the Corvette and El Cam

[Joe C.]

Re: 1966-67, 1970-71 Air Cleaner Dimensions Needed

Joe,

On my 67/327/300 the dropdown is 1-15/16" along the sides and back, add 1/32" in the front, but it is not 2" or over. Here's a pic:



Not sure about the part number, but guaranteed original to my 67.

BTW Still doing my penetance in house chores for going to the National
But I'm almost there to spend some time with the Corvette and El Cam

Thanks Jerry! I was counting on you to provide the missing information.

I will assume that ALL 1966-72, 4 BBL Corvette air cleaner housings were of the 2" drop-down type. Anyway, plus/minus 1/16" on a 2" overall dimension (6.25% accuracy) is "close enough for government work".

Hey...............maybe your air cleaner shrunk. After all, it's a 42 year old original. I see another Restorer article coming.