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OMC 3Cyl carb identification

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 PostPosted: January 3rd, 2017, 9:15 pm   
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Can anyone help identify this set of OMC 3Cyl carbs? the casting on the body of all three is 321406.

There is a "70" marked in ink/paint on the top of all three bodies, and the front opening is 1.5"

photos:
http://mattmak.com/photos/omc_3cyl_carb ... /index.php

The interwebs haven't helped much. Only found one reference.

thanks,
M

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Critchfield T850 OMC 75 49ci
Delta T750 Yamaha 55
1989 Voodoo Yamaha 70
1980 Thundercraft v142 Restored


Last edited by mattmak on January 4th, 2017, 2:00 pm, edited 1 time in total.

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 PostPosted: January 3rd, 2017, 9:55 pm   
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Well, I kinda reverse searched for similar looking carbs via google images and it looks like they are early 70hp, so like 1974 or 1975?

The next question is are they useful for anything? I do plan on restoring a very early 3cyl for nostalgic reasons and am wondering if these will work with the 1970ish 60hp block..

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Critchfield T850 OMC 75 49ci
Delta T750 Yamaha 55
1989 Voodoo Yamaha 70
1980 Thundercraft v142 Restored


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 PostPosted: January 4th, 2017, 9:58 am   
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These sound like the standard carbs for the 49.1 cid 60, 65, & 70 hp. Do they have manual choke plates and are they 1 3/8" bore on the intake plate side?


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 PostPosted: January 4th, 2017, 12:59 pm   
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hec2buck wrote:
Do they have manual choke plates and are they 1 3/8" bore on the intake plate side?


Yes and yes. I've searched for 70hp carb photos online and these look a lot like what comes up for approx 1974 to 1978..

EDIT: added link to photos in the first post.

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Critchfield T850 OMC 75 49ci
Delta T750 Yamaha 55
1989 Voodoo Yamaha 70
1980 Thundercraft v142 Restored


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 PostPosted: January 5th, 2017, 10:02 am   
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Joined: August 22nd, 2013, 4:13 pm
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Yes. those are mid 70's carbs from 49.1 cid. All motors except the 75 hp Stinger


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