Air Cleaner Base 1970 LT-1

[Dave S.]

Re: Air Cleaner Base 1970 LT-1

And I was wondering if the base might be the same as the 1971 Corvette LS6 -- but we should probably confine our survey to the more common application first before we open another can of worms.

Just to confuse things I've attached a photo of my 70 LT-1 #14803. As you can see it points to the rocker cover like my 71 and not rear toward the heater. I'm the second owner of this car for many years so I can't say for 100% certainty that it is the original but it has been collector owned since new and has 13K original miles. I'm sure while it was getting its awards the orientation was never an issue for the reasons mentioned above.

[David L.]

Re: Air Cleaner Base 1970 LT-1

Would the 1970 LT-1 base be the same as the 1969 Camaro Z-28 base?

Scott,

The answer is yes.

According to the 1969 Camaro AIM (UPC Z28, sheet A5) the 6423907 air cleaner assembly was replaced with the 6423272 air cleaner assembly as of 10/30/68 as per the revision record. The only difference between the two is the base which means the angle of the outlet tube. Who knows when the actual change took place on the assembly line?

My 1969 parts catalog (Oct. 68) lists GM # 6423907 for the 69 Camaro (302).

My 1969 parts catalog (Oct. 69) lists GM # 6423272 as 1st design and GM # 6423907 as 2nd design for the 69 Camaro (302). The sequence seems to be backwards when compared to the AIM change.

Based on my research of other assembly manuals the 6423907 air cleaner asm. used hose # 3942518 and the 6423272 used hose # 3932336. I believe that the 3232336 hose is about 1" longer then the 3942518 hose.

Dave

[David L.]

Re: Air Cleaner Base 1970 LT-1

A22 build

Keith,
Your base is part # is 6422188 (Gr. 3.406). According to my notes I saw a NOS 6422188 base at Summer Carlisle (July 1991) and drew a rough sketch. GM # 6422188 is only the base. The air cleaner assemblies (lid, filter, and base) have different part numbers (Gr. 3.402).

Dave

[Paul O.]

Re: Air Cleaner Base 1970 LT-1

Just to confuse things I've attached a photo of my 70 LT-1 #14803. As you can see it points to the rocker cover like my 71 and not rear toward the heater. I'm the second owner of this car for many years so I can't say for 100% certainty that it is the original but it has been collector owned since new and has 13K original miles. I'm sure while it was getting its awards the orientation was never an issue for the reasons mentioned above.

Dave

Thank you for the photo and input just trying to see if and when there may have been a change in configuration. Or that ether base assembly could be used during assembly at any time.

I only have a 1971 AIM and in the LT-1 section it does not list a part # for the air cleaner assembly. It has UPC LT1 sheet A2 for air cleaner and Silencer as UPC 6 6M3 and then indicates Assemble same as production See parts list or Bill of Material for part number.

The LS6 lists the air cleaner as 6485239 but that is for the LS6. I think we have gone here before on another subject and those part numbers are not available.


Paul 18046

[Paul O.]

Re: Air Cleaner Base 1970 LT-1

Scott,

The answer is yes.

According to the 1969 Camaro AIM (UPC Z28, sheet A5) the 6423907 air cleaner assembly was replaced with the 6423272 air cleaner assembly as of 10/30/68 as per the revision record. The only difference between the two is the base which means the angle of the outlet tube. Who knows when the actual change took place on the assembly line?

My 1969 parts catalog (Oct. 68) lists GM # 6423907 for the 69 Camaro (302).

My 1969 parts catalog (Oct. 69) lists GM # 6423272 as 1st design and GM # 6423907 as 2nd design for the 69 Camaro (302). The sequence seems to be backwards when compared to the AIM change.

Based on my research of other assembly manuals the 6423907 air cleaner asm. used hose # 3942518 and the 6423272 used hose # 3932336. I believe that the 3232336 hose is about 1" longer then the 3942518 hose.

Dave

Dave

Thank you for your input but at this point I would like to stay on the Corvette side and see where it may lead us. The Camaro may have the same assembly but it may not. If we can get to a definitive point with the Corvette then we could add other makes to the mix.

Paul 18046

[Mark S.]

Re: Air Cleaner Base 1970 LT-1

The first picture below is from my former 70 LT-1, #13601. The air cleaner base is believed to be original. It looks to be pointing at the valve cover. The second picture is from my former 71 LT-1, #15803. Clearly pointing at the valve cover. My current 70 LT-1 does not have the original base.

[Gary B.]

Re: Air Cleaner Base 1970 LT-1

#14544, 1970 with 39,000 miles when picture was taken. Two owner car, pretty sure it was right.
Gary

[Ronald L.]

Re: Air Cleaner Base 1970 LT-1

Paul, If the part number in question is the same as a Camaro for that same year, its irrelevant, the part is the part.

The larger question here is what did St Louis buy, if it does not show in the AIM???

Funny the 1974 Corvette GMPD parts book does not show a cleaner asy for 1970 SP HP (aka Lt1).

BTW--- I have a 'from the day' in the dated box NOS x272 asy and the tube points to the side.

[Warren F.]

Re: Air Cleaner Base 1970 LT-1

Paul,

To me Mark Stanton's two photos show the tube oriented slightly differently. I'd say the top photo has the tube pointing at an angle to the rocker arm cover and I would say it could be facing the firewall.

The second photo difinitely shows the tub oriented at more of a 90 degree angle to the rocker arm cover and wouldn't be considered pointing to the firewall at all.

PS: I figured out the coil bracket scenario for the LS6 application okay, the small hole however is seen in both above and below positions, with no rhyme or reason that I can account for.

[Paul O.]

Re: Air Cleaner Base 1970 LT-1

Warren


In those 2 photos it looks to me that the tube is pointing the same direction but the hose is routed different. Some of the photos posted it is around 45deg change in tube position.

Paul 18046

[Patrick B.]

Re: Air Cleaner Base 1970 LT-1

The first two photos show the air cleaner base from my 1970 LT-1 ser# 14297 built July 3, 1970. It points toward the firewall at an angle like the air cleaner base in Paul's first picture. I am sure this is the original air cleaner. I bought the car from the original owner in 1972 when the car had only 8,000 miles on it.

The third picture shows an air cleaner base that looks like the units that point toward the valve cover. It is a service piece for a 1971 LS-6 that I bought from the Chevy dealer in 1982. You can see why it works so well on a big block - the tube points straight toward the breather opening in the valve cover. When I put this engine in the LT-1 in 1982, I tried to use the LT-1 base but I could not bend the hose to make it fit the big block. So apparently the LS-6 bases will work on either an LS-6 or an LT-1, but one type of 70 LT-1 base will not work on a big block. Maybe that is why the firewall oriented base does not appear in 1971.

[Warren F.]

Re: Air Cleaner Base 1970 LT-1

The 1971 original air cleaner base plate for the LS6 option did not have a configuration like that 3rd photo shown. The part # is unique for this engine option, the part # for the 1970-71 LT-1 is different.

[Patrick B.]

Re: Air Cleaner Base 1970 LT-1

Warren:
How does the service replacement LS-6 base in the photo differ from the OE version? I presume the angle of the pipe is the same.

[Timothy B.]

Re: Air Cleaner Base 1970 LT-1

Looking at Mark Stanton's photos it seems like the difference is in the way the rubber hose is turned. Move it 180* and the valve cover nipple points the other direction. My base is like mark's first picture.

[Ronald L.]

Re: Air Cleaner Base 1970 LT-1

Warren,


When you say the part numbers are different, what are those part numbers...the carb conn plate? The Air Clean. Asy? or?

To lock in one of them for you, the carb connecting plate (to use the GM print terminology), and as Dave has provided below is: 6422188