408 original air cleaner dimensions, please?

[Kevin H]

David,
I've just looked at some of the photos you posted and your air cleaner sits up quite high above the flange on top of the carby, whereas some original style air cleaners start below the flange because the bottom of the air cleaner is recessed.

Hopefully the attached picture of mine will give you an idea of what I mean.

I believe there is a good chance a standard Mopar air cleaner for the A (LA) series 360 engine will fit under your bonnet, or should I say hood!

If you buy a secondhand one on eBay, if it doesn't fit you can always sell it again on ebay

Kevin

[Kevin H]

David,
This one looks like it sits quite snug https://www.forbbodiesonly.com/mopar...01-jpg.532225/ .

For what it's worth, the height of your carby is the same as mine - 3.250 in.

Also bear in mind that the bonnet is higher in the middle than it is at the sides where it meets with wings.

If you are prepared to take the plunge and buy a secondhand one on eBay, at least you are the in the right country . If you do find one that fits, you can probably get a replacement post for the centre of the carby. It looks like you could buy a period single snorkle air cleaner for around $100.

Kevin

[dwomby]

Here's a mockup I made of a 17" dual snorkel 3" high that I considered buying.

It might work if I can lower it but probably more likely to fit if I use a 14" dual snorkel. There are separate lowered 14" bases available. Maybe I could cut the base out of a factory dual snorkel one and rivet/solder one of the lowered ones in its place. I'll play with mocking that up today.

David

[peter dowdle]

Interesting found on Austrslian Ebay

https://www.ebay.com.au/itm/Mopar-do...8AAOSwfD5dTqA7

[dwomby]

Yes but a bit pricey compared to some local (eBay) stuff.

David

[peter dowdle]

David

The summit carbie you have does seem very tall and Kevin is right the air cleaner sits very high . My 411 Mk2 (high compression motor ) had a 750 holley on it and performed very poorly and used a lot of fuel. A friend of my brother Geoff who would likely be Australia's authority on all things Mopar strongly recommended going back to an original Carter (Edelbrock) 650 cfm carbie. I took his advice and it transformed the general running of the motor ( very pleased). Since then Edelbrock have released a new series the AVS2.They come in avariety of sizes and finishes, I plan to fit a 1906 to my 412 shortly.
You motor is smaller than mine but is warmed over therefore a 650 cfm like my new one would be ideal . Check the website for dimensions ( the video is worth a watch). One danger if you change carbies make sure you set the auto transmission kick down correctly or you will burn out thr transmission.

Your correct, the point of first contact with the air cleaner is at the front because the bonnet slopes down.

[dwomby]

Thanks, Peter. Whilst the Edelbrock 1906 may well improve the drivability, it seems it is 3.25" high same as the Summit one currently fitted. I am going to focus for now on getting a quieter, more stock looking air cleaner on there somehow but will bear the carb change in mind for future.

My US born and bred neighbour who likes loud cars and motorcycles suggested I cut the 'hood and fit a shaker intake'. Heaven forbid!

David

[dwomby]

Originally Posted by peter dowdle

David
set the auto transmission kick down correctly or you will burn out thetransmission.

Peter, just as an aside: how do I check/set this anyway, please?

David

[dwomby]

Originally Posted by Kevin H

>
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Hopefully the attached picture of mine will give you an idea of what I mean.
>
>
Kevin

What diameter is your air cleaner, Kevin and also, how high is your intake manifold? Mine is about 3 3/4" / ~95mm.

David

[Kevin H]

Originally Posted by dwomby

What diameter is your air cleaner, Kevin and also, how high is your intake manifold? Mine is about 3 3/4" / ~95mm.

David

Hi David,
Sorry about the late reply. My air cleaner is 17" diameter (underside it's a little wider at the top). The hole for the carby is 5".

My carb is an Edelbrock (1812) 800 CFM AVS Thunder (manual choke, which is not used).

However, my engine is a B block, so possibly a little wider in the valley than the small block 360.

As stated previously, the air cleaner is 90mm high, although the bottom is recessed, so the effective height off the top of the carb is 81mm. So 81mm higher than the flange around the top of the carb.

Unfortunately I can't say how the bonnet of the 411 compares with the 408.

Kevin

[dwomby]

Thanks, Kevin. It helps me zero in on what might fit although lots of mocking up and test fitting seems to be in my future. I'll keep this thread posted as ( or if ) I make progress.

David

[dwomby]

I have fitted the 14" round air cleaner. It has a deep (~1") recess in the underside. I put 3/8" thick expanded polystyrene blocks on the forward edge and the top nut to see if closing the bonnet left any indentations. I didn't see any, so I tried to film the inside of the bonnet when closed to see how much clearance there was. The video is here: https://youtu.be/oX2-ctVTgs4 The film of the front edge is quite clear but the film trying to see the top nut didn't work as I couldn't get enough light on the place. Still, I am quite pleased with the fit. Now I need to go a drive to see if it's any quieter.

If I need more, the next step is to buy a used snorkel/silenced air cleaner and, if necessary, cut out its bottom and fit the recessed part of this 14" onto it.

David

[AndrewA]

Looks better - hope it's quieter!