As Close to an AMC as it Gets......

[mudkicker715]

Never seen it done that well done to get it to fit. My 2v mani fit without mods on a stock intake

[eagleman]

Lookin fine there my man! Nice work!!

[shaggimo]

Thanks guys!
Are you running an HO head or early mk? The renix era ones I believe are still configured like the 258s, but I could be wrong on that. This Offy intake is huge though too, it dwarfs the stock 2bbl intake and the 4.0 injection intake   , so that's most of the reason for additional mods.

[mudkicker715]

Memory.......... 94¿??.... Ho head for sure. Could be 92.¿

[HappyPappy]

With a BMH and a smoke wrench anything is possible!!

[shaggimo]

indeed, lol.

[priya]

Is that offenhauser a dual port?
Is it water heated?

[shaggimo]

Yes and yes, lol, that's why I bit the bullet for a new one, I couldn't find one used (well not as fast as I needed it, lol).

[priya]

Yes and yes, lol, that's why I bit the bullet for a new one, I couldn't find one used (well not as fast as I needed it, lol).

I wanted one like that but my husband said I already had the Clifford intake so I couldn't buy one.  I suppose if it had required cutting apart my clifford 258 header that would have been something to consider.

[shaggimo]

I believe the clifford is a bit more fit friendly that the offy. Have yet to actually see one (clifford), but from what I have read, many people have had issues with the offy just being too big, lol, where as the clifford just bolts on. I too, may have some hood clearance issues, but oh well, worst case scenario I cut a hole in the hood, make a scoop and repaint, lol.

[shaggimo]

Not a whole lot to report, been keeping busy with minor details, getting all the wiring loomed up, accessories working, fenders bolted on (were just mock fitted), seams sealed, engine put back together, etc, etc, etc. Once I had the intake bolted to the engine, I ran into another snag, the original injected intake had mounts for the power steering pump to bolt to, the offy, not so, lol, at least not the same. I spent a night or so planning out and making a solution, in other words an adapter bracket.


What started out as a flat chuck of 3/16 plate.



mock up to intake with pump





Ready to go!

Next on the agenda, the carb......I called up a friend of mine who hates them (carbs), he wanted his old ones off his bench, so I got a bunch of carbs to pick a part. Took a bit of time to dig them all out, but 10 parts carbs....Giggity. lol Once I got them all home and identified, I was able to pick my victim, 1980 chevy truck 800cfm quadrajet  .


The pile!


The winner! :lol:



Cracked it open to find it was pretty gummed up and nasty, found a few other issues with it, but for the most part the carb was in good shape. I let it soak in carb dip for about 9 hours, then started my rebuild. I got lucky enough to have gotten a throttle plate that did not need to be bushed, so that was a big plus.





A mod to prevent leakage, little epoxy over the caps just as an insurance policy as they are noted for leaking.


Ran into a snag when I got to this point, I went to put on the airhorn, and realized the Olds configured one I chose to use was not quite the same as the chevy body I was using. So that put me back a night, lol. I was able to salvage the chev horn with a little extra work so no big deal, it's all together now,   .




There you have it, The Rochester Quadrajet, the carb that everyone loves to hate  


Here we are mocked up to the engine, I'm in process of making my attachment brackets (fuel pressure regulator, throttle cable, trans cable, and tps). It seems likely I'll have to make my own air cleaner too, as hood clearance appears a little tight, hahaha I'm hoping I may be able to squeak a GM tbi hose intake type on there, we shall see....

[shaggimo]

lol, ah yes, I forgot to mention I dug out my old squarebore to spreadbore carb adapter, good eye  , lol.

[GRONK]

Brother, just my experience, that 800CFM carb is going to be way too big for the 258.  My $.02

[Sunny]

Are you sure it's an 800CFM Quadrajet? Most of them were 750 and under.

How come such a huge carb for a small motor?
an 800CFM is massively overkill.

[shaggimo]

lol, Yes, I am sure it's an 800, I do have a 750cfm as well,  it's a carter built version, looks a lot different on the outside, similar to the pre 75 models (I don't have parts for that type). Now I didn't go stock on this, I trimmed her down a bit, and I can go further if need be this is just my starting point. I have a collection of primary rods and jets, springs, different sets of secondary rods and hangers. It will be fun tuning this in, I have my work cut out for me, but it will work nice once I have it right. Besides these were designed to run super lean from the factory, I believe the primary side may only flow 225? So once I get the primaries set right with the part throttle, the secondaries are a breeze.
Oh this is a 4.0 btw  , yes I'm that sick to have thrown away my efi in favor of a dinosaur.