Manifold question

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volaredon

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Who knows what about an offenhauser "360"?
I have one I was thinking of putting onto a 318 powered B body when I put my 302 heads onto it, my other choice on the shelf is a regular (non air gap) performer. The 360 looks like a single plane with a center divider.
Don't single plane manifolds draw less vacuum than a dual plane intake, with all else equal?
Though I THINK I remember back in the late 60s the 318s ran a single plane 2 bbl. Though it's been a while since I have worked on one, since my brother had his 68 charger.
I am doing a lean burn ectomy and since the original carb needs rebuild anyway, I have 2 choices of carb at my disposal/ actually a couple of each: a 500 and a 600 AFB, as well as a couple of TQs. Which manifold would you run on a cruiser that occasionally is used like a daily driver in warm months? I'm also considering a small cam, a comp 260 among the bigger of the 2.
 
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so, who knows what, about this Offenhauser intake? I don't think it's the "port o Sonic," which (as I remember) was another Offy intake.... I don't remember seeing any other ID'ing numbers on this Offy intake that I have. It is undoubtedly a small block Mopar intake. What applications would it be best for? (no, not gonna accept "scrap" as an answer) what were they "going for" when they came out with this intake?
I've run Performers before, and I've run SP-2P before (currently don't have one of those) which did fine, for my needs, at the time.
and I had a "streetmaster 318" on a D150 years ago.... as I remember, that was a single plane.... but mostly interested in hearing about what I currently "have here" mainly the Offy-----I'm not "married" to the idea of using this intake, just sayin'. But I wanna know what the story is/was with them....

I am leaning toward the Performer for the Fury, if only because it's "cleaner looking," and this Offy is dull and dingey. but I also know that, by itself, isn't a valid reason for choosing one over the other.

I converted the one side of my garage into a quasi "paint booth" and had to move a few things around.... and this was one of those "things" that I had to move. I almost threw it "into" my makeshift paint booth, because among other things, I have alot of parts I'm spraying Chrysler (engine) Blue onto, anyway. I'll talk more about that some other place.
I think this is the 1st intake that My son had this one mounted to the 360 in his Ramcharger. and he had to swap it out before it was even run. I don't remember why.
It may have been because of A/C-thermostat interference? His has the aluminum (Sanden?) I'm grasping for the reason there, it's been a few years. but my Fury has the RV2 comp, so I don't think that would be an issue in my case.
 
250 @ 50 is HUGE cam for a mild street driven Heavy318 B Body in my experience. My choice would be around 220 @ 50
The performer would be my choice of intakes although with a thermoquad the
production cast iron intake made as much power up to 5000 RPMs.
 
I doubt I'll ever see 5k RPM with this engine/car.
I didn't think the 260 I'm considering, was 250*@ 50. I'll have to check that. (mostly considering that 260, just because it's here/ I don't have to buy it) along with the Performer and Offy intakes I asked about.
but nevermind that, for a minute. still looking at "where would be a good application to use the Offy that I have"/ partly as a "do I keep it, do I hang onto it for future" or do I sell/trade it away? kind of thing.
 
Can’t help you on “the rest of the story” but If you didn’t have that intake what would you be using? If that intake was laying on a table with a bunch of other intakes at a swap meet and you needed to buy one, you definitely wouldn’t be picking that one. 318, 302 heads, B-body? Sell it, bolt on that Performer you already have. Seriously, a no brainer.
 
Picks of said intake from this site in a sold post 2017

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That offy 360 is a good looking manifold and in the right combo would probably perform well, just not your combo I totally agree with the prior post a moderate dual plane is by far your best bet and in my opinion a factory 360 thermoquad setup would be hard to beat.
 
In your case i'd use the Performer. As far as the cam, the high energy 260 is ok, but i'd look at the Summit 6900 at about half the price. Use whatever carb you have in the best shape. The AFB's may require a plate to seal well with the Perf.

P.S. I always try to remind people that if you're going from a 2 to 4bbl, make sure you get the trans linkage close to spot on.
 
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In your case i'd use the Performer. As far as the cam, the high energy 260 is ok, but i'd look at the Summit 6900 at about half the price. Use whatever carb you have in the best shape. The AFB's may require a plate to seal well with the Perf.

P.S. I always try to remind people that if you're going from a 2 to 4bbl, make sure you get the trans linkage close to spot on.

the Summit cam, at half the price of the 260? I didn't know that "free" could be cut in half. I have the 260 on the shelf from an older project.
If I buy a cam, I will probably go with a 360-2bbl stock replacement. I've done that before on 318s, and was real happy. DEAD RINGER for a COMP 252/ except for the lift (0.015" difference) and a Melling 360-2 replacement cam was 1/2 the price of the COMP 252, the last time I'd bought one. for 1/2 the price I will live with 0.015" less lift (rest of specs identical) I was real happy with that cam in my 83 D250 with a 318. I ran a Performer intake and AFB carb on that one, but I also put Magnum heads on the LA block, (this time I am going with '302s/ because again I HAVE them) and I put a pair of Hooker Super Comp headers on that engine. Not going with headers on this one though I already have true duals to the bumper in place. may go to Magnum manifolds or shorty headers down the road.

Another difference in the truck? 3.55 gears, 32" tall (235/85-16) tires vs (for the time being at least) 2.71s with 225/70-15s (unsure of height of those) I won't be with my Fury, but I hauled and towed (often) with that truck. and also ran 1000 miles a week with light (or no) load several times, after the upgrade. I miss that truck.
It had loads more power and gas mileage/ definitely improved vs stock. Especially on a road trip. And it even ran happily on E85, if I felt like running it. When I would do so, I'd usually run 1/2 a tank E85 and 1/2 a tank 87 octane. I liked doing so whenever I had to go to Indiana for anything, as E85 was MUCH cheaper over there, not the 6 or 8 cents it saves you here in Illinois. it was 40-60 cents a gallon cheaper than 87 at some stations back then. If the truck ran it without complaining, I didn't complain. Probably won't try the E85 in this car though. If only because there isnt enough difference in price anymore to justify it. so E85 runnability isn't a concern here.
This was all applied to a stock, unrebuilt 135k mile short block, that was never pulled from the truck.
My Fury doesn't quite have 1/2 that mileage. Im at 57k original miles on the Fury, I'm 2nd owner, got it with 38k in 2007
Its a 78, 2 door hardtop. Original maroon paint.
I will loook into that Summit cam though out of curiosity.
Id like to swap to somewhere around 2.94-3.08-3.21 in the Fury, eventually. It is great on gas as is (though a little flat on perf) and believe it or not the Lean burn still works. Its starting to ping at weird times so I think the lean burn may be starting to go goofy on me. Totally stock except for teh dual exhaust at present. Carb needs rebuilt due to little usage, not wanting to idle cleanly the past summer and a half. otherwise carb is fine. just needs cleaning really but I need to swap it out for vacuum advance port to eliminate that lean burn. has a Holley 2280 (factory original carb) that I have kitted, a couple times over the years.

and yup the intake you post is the exact one I opened this thread, questioning. Thanks for that,

For carbs I have 2 fresh TQs (not been on an engine since Demon Sizzler went thru them, rebushed them, and rejetted them) so those would be good to go.
I have a 9801 "Competition" TQ with integral choke Unknown condition but very clean. Wouldn't be afraid to drop that one on as is, and go as a test.
I have a 950x AFB/Edelbrock (forget which, they are the same) 500 cfm with fresh kit in it This was the carb I was leaning towards as a 1st choice.
(not set in stone)
And I have at least 1, Edelbrock/AFB (again forget which) "600" I think they were "625" as a Carter, "600" as an Edelbrock. need freshened but I have kits on hand.
 
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Can’t help you on “the rest of the story” but If you didn’t have that intake what would you be using? If that intake was laying on a table with a bunch of other intakes at a swap meet and you needed to buy one, you definitely wouldn’t be picking that one. 318, 302 heads, B-body? Sell it, bolt on that Performer you already have. Seriously, a no brainer.
I was at ICH last weekend, saw more LD4b and LD340s there that day than I have ever seen in any one place which are supposed to be the "be all, end all" absolute best manifolds ever made, holy grail for a small block. But I wasn't paying what they were wanting for them, everyone was at $250-275. and there were a handful of sellers that had your proverbial "table full of intakes" you mention, of all brands for a small block. I think the only one I didn't see was an SP-2P. Which doesn't mean there werent any there. I looked at alot of them while walking down the aisles.
 
That sp2p is good for mileage.
The only intake I’d consider using these days are;
Edelbrock- RPM and the AG version.
The LD340 & LD4B are good. with single planes, on old intakes, it’s the MP-M1, modified Offy Port-O-sonic or Holley stop dominator.

On new single plane intakes, Edelbrock Victor’s or Indy.
I haven’t seen a TF yet. Not in my hands anyway.
 
What post #2 said.
Offy manifolds are beautifully made, but the single plane design sucks if economy is the goal.
 
The Offenhauser 360 is a really good intake. The 360 Dual Port is a low RPM POS turd that's best used on stock or VERY mild engines.....or even better as a door stop, so make sure it's not a 360 Dual Port. They made both and the standard 360 is the better of the two by far.
 
Thanks guys. As I'd said earlier, I wasn't set on using this offy / just wanted some info on it, that's all.
Not trying to argue with anyone just asking questions.
 
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