jokes on you, the inherent design of the two barrel has two modes: idle and FOWAONot if you never go WOT!
it's not a bug, it's a feature.
*full on wide *** open
318 intakes - old style?
- Thread starter 318willrun
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it's not a bug, it's a feature.
*full on wide *** open
Professor Fate
Push the button, Max...
The mismatch is very little and is done all the time. Even the factory did it with the late 318 4 bbl. cop motors.
My guess is you had other issues going on with the carb.
I'll just run the newer style intake if I stick to the 318 2bbl plan. Thanks for the input fellows
Woody500
Well-Known Member
Same casting number as a 273 4 barrel single plane factory piece.
Woody500
Well-Known Member
And some have 2 impeller(known as 2 pocket) pumps & each bank has separate flow & water cooled exhaust.
I have a 1971 D100 with the original 318 and it has the single plane 2BBL manifold on it. I would think that the factory would have put the intake with the best grunt into the pickup trucks. Just my thoughts. It definitely likes gas but pulls strong even pulling a car trailer.
MILO
Well-Known Member
You will be fine with that 2bbl manifold just put a RV cam in it and it will have good torque at low rpm
furrystump
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Is a 68 318 2 barrel of interest to you? I have one I will never use.
It would be fun to compare, but shipping is a killer .....
furrystump
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Can’t remember what state you’re out of, but I get around a bit.
Up by the Wis & IL border
I have one too, thanks
But remember, this is a discussion thread and not a Parts Wanted ad.
MoparLeo
NRA BENEFACTOR LEVEL LIFE MEMBER
Dual plane, no question offers better low end torque. That is what they were designed for.
Single plane is a high rpm/top end type manifold. Poor low speed runner velocity.
Single plane is a high rpm/top end type manifold. Poor low speed runner velocity.
Blanket statement that's mostly true.... but, not in all cases. Small block Holley Street Dominator was a single plane that I did a comparison against other dual plane intakes such as Weiand Action Plus and factory cast 4bbl intake and the SD cut the same 60 ft times. Some stock engines came with single plane intakes that created lots of low end. Like the older 318 single plane, not shy on punch whatsoever.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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When you swapped to the 318 intake, did you use the same 360 carb?
Cuz in my experience, the problem you describe with the 360 carb on the 360 intake, is NOT the intake. Rather, it's the 360 carb.
I spent several hours on a combo like that, to get the 360 carb sorted out, and a matching ignition timing curve for it, after which it ran like the proverbial raped ape.
But, IMO, I'd just slap a 2800 convertor on it and run any old intake and carb.
Always loved those intakes, like the looks of them.
And always loved the '89 TBI, 318 Dual Plane, Mid Rise intake even more.
Top that off with the Stromberg 2 bbl, hands down best performance 2 bbl I have ever tested.
Proven Test results >
Tested 5 two barrel carbs that day, the BBD 2 bbl was by far the most low performance of all. The Stromberg 2 bbl was by far the best performing 2 bbl.
The 360 stock 2 bbl was a close 2nd.
☆☆☆☆☆
Love the '68 9.2:1 cr 318, 230 hp 2 bbl engines.
Free Floating Light stock rods, Pistons .040 ths in the hole on the stock bore.
☆☆☆☆☆
Look at the meat between those cylinders. I bet that block can stand .100" over and not even sweat.
Always have to say Thank You to @318willrun for being the first to do the Mopar Stock Distributor HEI conversion. Nice simple upgrade and add an E-Core (60,000 volt, stock components 1995 OEM) coil with plugs gapped at .050 ths > Wow !
Straight 12 volt and no ballast resistor.
Thank You for experimenting...
* * * * *
Straight 12 volt and no ballast resistor.
Thank You for experimenting...
* * * * *
Woody500
Well-Known Member
LM318 Marine four barrel single plane, is the same casting number as 273 four barrel, but has a taller carb mount, which is then machined at an angle to match the installed angle on a boat, so carb sits level(parallel to waterline). Uses a Carter 4 barrel, forget tag number.
I owned a 1974 Century Ski Fury with one in it, one of 57 that year, and 206 over three year run, '73-4-5.
It seemed to take a while to dig out of the hole upon acceleration, but boat is a deep-vee and has more drag at low speeds.
It will go 44mph @4400rpm, which is handy, as old boat speedos suck for accuracy.
You can also 'regear' by changing either propeller pitch or slightly more cup for a smaller change. Of course, you're then going to lose top speed, and possibly speed holding for slalom skiing, as originally sold as tournament style ski boat.
So factory Diameter & pitch probably best.
That LM318 run of engines(don't know how many) were built during 1968 model year, IIRC so probably have same componants as car engines of that year. Then were warehoused until needed.
Some are opposite rotation so crankshaft can't be used on a car or rear main seal will leak, as wipers 'hashed' in wrong direction.
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I Can make an adapter plate if you
I will make an adapter plate for this manifold if you want. I'm about 100 miles from you or less.
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