Technical Olds 3 deuce intake - what size, year does it fit??

Just got this intake. Only mark is the Offy logo. Anyone know what size and year it fits? Thanks in advance.

 

Looks like 49' - 56 Olds, 303" - 324"cubic inch.

 

need to see the port size as 303 had small ports and 324 were larger ask me how I know

 

I think it is early Olds, like the guys said, and I was going to say it looked different than my 59-64 394 intake, but, from the pictures, it is hard to tell. So now I am not so sure. I can measure things on mine if it would help you.





Don

 

You need to check it against a 303 and a 324 gasket. It appears to be an early, (pre'56), intake but it is tough to tell from the pic. Remember the early 303 intakes don't cover the ports on the later #10 heads. They will bolt up but not seal at the top. Also check the port match on heads you are using as there are several variations. If you check against your heads make sure you bolt it up as the later 371 variety looks the same but sets .120 higher so once again there is a port problem and the bolt holes will just slightly not line up. You can make the 371 style work on the '56 and older engine by milling the intake but there are still port issues. Now you're really confused.... Ask me how I know.

If you shoot me port dimensions I can most likely tell you what it fits.

 

Let me know if this shot helps on the id. Thanks

 

not for 303 as it has large ports 324-394?

 

If I get the measurement to you can you tell me what year(s) and size(s) it will fit? Thanks for the help

 

Will certainly help narrow it down. I'll also check my '49-56 Edelbrock
manifold tomorrow.

 

Post up the critical dimensions and we can get an educated guess going. Port dimensions will tell you if it is an early or late intake. There is only .120 difference in width, (or height), depending on how you measure between '56 #10 heads and the later motors so I'm not sure how to measure for this. The breaking point for width is '56 after which all intakes were wider. 303 used smaller ports than the 324 so that one is easy. The give away on Olds is the water ports to the rear although some Pontiacs, Caddys, and Y blocks used a similar configuration. Some bolt hole dimensions will tell if it is indeed Olds. I have most variations of Olds intakes on the shelf here so we should be able to match one up. If we can figure out what it is I'll mail you a tracing for confirmation.

 

You may find these after-market manifolds are a so-called "universal fit" for the
'49-56 group. My Edelbrock OL-396 small ports measure 1 3/16" x 1 9/16".
I purchased this setup back in '67, so can't remember if it came off a 303 or 324,
but in any event, the ports are smaller than my '56 heads. Will need to grind
them out some for a better match.
If your Offy manifold is an early one, it will likely have the same port size.

 

The rectangular ports are 2" by 1 1/8". The square in between is 1 1/4" by 1 1/4"
Thanks for any help.

 

Just added some dimensions. Any help is appreciated. Thanks

 

The intake you have is for a '56 324, #10 heads. It will work on the earlier 303/324 but will either need some port adjustment or will just not flow as well and possibly have some reversion problems. In my humble, (and usually wrong), opinion, this intake will work best with Holley 94's you have as opposed to the Strombergs. Great choice for a strong running but manageable street motor.

I'd set the 'trips up with Primary #54 jets and #57 or #58 in the secondarys for a decent street motor with the usual cam choices, distributor 20 deg. @ 2000 RPM. All in at 2000 RPM and it will talk to you!

 

Thanks a bunch for the info and the setup specs. My Holleys are all mismatched and are on Eb*y now, but there are matched sets out there.

 

The mismatch on the Holley # really won't matter as long as all the venturis are the same size, which is most likely the case.