3x2 Edelbrock flathead intakes questions

Thanks B&S, I would appreciate some advice on how to take care of that issues if using this intake on my 50' Merc engine.

I noticed about the tube hole but have no clue about what is it for.


Diego

 

Thanks B&S, I would appreciate some advice on how to take care of that issues if using this intake on my 50' Merc engine.

I noticed about the tube hole but have no clue about what is it for.


Diego

 

my su349 for 49-51 flattys the 359 was for the earlier flattys without the vent system and also to this intake work on an older flathead you would have to drill counter-sinks for the alighnment pins.

 

in other words this su349 would be the "proper" intake for your 49-51 motor

 

merc jo do you kave a 349 or 359? i have a 359 on a 50 merc with a pcv valve setup from gollers hot rods on it. Its totaly hidden, if you have a 349 they make a pcv valve setup to go in one of the hole upfront on the intake. www.gollershotrods.com seemed like a great guy answered all my questions if you want me to take pics of my motor let me know

 

I have a 359 I was planning on using on another flatty, but I wondered if I could use it on my 50' Merc instead. Still not clear why I shouldnt use it, I know.., the vent system, but this has to do just with my ignorance between the two engines.

Honestly, this vent thing is new to me.

Yes, post pics if you can !!

Thanks Wolf
Diego

 

So, Is lonewolf right ? could I use the 359 that way on my later 50 flatty ?

 

Yes.

You can use any intake on any engine. You will just have to sort out the engine breathing - well-documented either way.

 

Now, changing the subject a little. I want to use just 2 carbs and one dummy for the looks. My Merc is a driver so I and dont wanna have tunning troubles..., which 2 of the three should I choose ?

Thanks
Diego

 

Personally, I think tuning a 3x2 with progressive linkage is easier than tuning a 2x2 with straight linkage.

But if you only want to run two carbs, you should probably run the two outer carbs & blank off the center carb.

 

Thanks Ernie,

I read somewhere, probably the HAMB that 3x2 setups were hard to tune for street use. if its not the case I'll go with the 3 carbs and a progressive linkage.

Any other input on this ?

Thanks
Diego

 

I ran a SU 359 on a 284 cube flathead on the street for a few years in high school -- with a progressive linkage. It was really pretty easy to tune, as long as you have some sort of "Unisyn" device to sync the outer two carbs. I ran it with Stromberg 97's as well as Holley 2110's. I ran a H&C dual coil setup with a Potvin 425 Eliminator cam . . . was a pretty fun flathead. I drove it to school and all over hell in Southern California in the 70's . . . was a reliable car and ran very well.

 

How does a "Unisyn" device work ? were to buy it ?

 

Another thing, Im leaving the engine all stock besides the intake. Isnt that an issue at tunning time ? no cam, no headers, etc.

D.

 

Anyone willing to trade the 359 for a 349 ?

 

IMHO . . . you should consider a good 3/4 CAM, a good ignition and headers. If you don't, then you'll never take advantage of a 3-pot manifold. Consider an Isky Max 1 cam - you should like what it is all about.

Are you tearing the engine down at all . . . or just throwing a manifold on it?

 

I gotta agree with B&S on this one.

 

This ancient post:
http://www.jalopyjournal.com/forum/showthread.php?t=16426&showall=1

has some numbers, but I'm putting it up for the drag/dyno test on the '40 Merc; this is a bolt-on stuff test on a stock flathead in a heavy car... I wish they had continued and tested the results with a cam in there.

 

Hi B&S,

The engine has been built already. Im throwing the manfold on.
Headers are not a big deal, changing the cam is.

How much an isky Max 1 is ?

I was thinking about pertronix ignition for the future.

Thanks
Diego

 

You need a different distributor, not a pertronix, on a '49-53. They don't have any problem at all making sparks or keeping points alive--they just can't make the sparks happen at the right time, especially with multiple carbs.

 

Hi Bruce,

Which one would you reccomend ?

D.

 

I use nothing but '42-48 type, so little help there...
Current Mallory has major quality issues, needs work before use...old Mallory is good but exoensive and hard to find...
MSD looks good, and likely best is a Chevy cut to fit because it is easy to tune the advance, vac and centrifugal, to you needs. Ron on Fordbarn converts them and has pictures of what needs to be done...'57-74 type Chevy.

 

Any advice from HAMBERS 3x2 advice on ignitions ?

Thanks
D.

 

Like Bruce said - vintage Mallory, although MSD makes a distributor & you can convert Chrysler electronic or Chevy to work with the flathead (both require machining).

Try a search for "flathead ignition chrysler" - a few should pop up.

 

There's a ready to run MSD distributor for later flatheads:

http://www.msdignition.com/dist_24.htm

Any feedback on this thing ?

Thanks
D.

 

Anything to say about that MSD dist. ?

 

What about the oil inlet if using the 359 on my later flatty ?

 

Just scored these yesterday. The Moon unit is a real find. My question is the inside of the manifolds are cast really rough. Would they benefit from smothing out or has anyone ever heard of them being cleaned up via flow bench?