That's the recipe for basic hot rodding a stock 318.
318 4 bbl and intake upgrade
- Thread starter bob7four
- Start date
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It works fine. Some people just won't believe it. People have done it for decades, just like Chrysler.
Dartfreak75
Restore it, Dont part it!
Its all good great minds think alike! Lol
Yawn…… Get educated before replying.
Couple years ago I put a stock '70 340 intake on my wife's '73 Challenger. Put a 625 Street Demon on top with a 1/2" phenolic spacer so the choke linkage would clear the factory choke stove casting. A buddy gave me the intake so I had it kicking around. Challenger already had '68-70 340 exhaust manifolds on it And TTI 2 1/2" exhaust. Ran the car on the dyno with the stock 2bbl setup and got the as 1973 advertised 150 HP. Might have been 150 and some change, but no powerhouse. Swapped the intake and carb, never touched the distributor so timing was the same. Picked up 30 HP at the rear wheels. Rest of the 318 is the tired, stock, as-assembled by Chrysler engine. Yea the ports mismatch. Doesn't matter for this application.
mygasser
Well-Known Member
compared to a 600/650/750 he will versus using a 500. that was clearly what was meant.
DartGTDan
'71 Dart GT Fan
Edelbrock LD4B & 1406 600 carburetor using Lokar throttle & "kickdown" linkage on the "Golden Oldie".
putting a four barrel on a other wise stock small valve head 318 won't give enough difference that you'll be able to tell in the seat of a 3400 lb car. but what it will make a difference on is how many times you fill up at the pump
Dartswinger70
Well-Known Member
They've been listening to Uncle Tony types on the internet. the guys with a perfectly good set of heads and an intake but want to take a Harbor freight grinder to them...
Dartswinger70
Well-Known Member
They've been listening to Uncle Tony types on the internet. The guys with a perfectly good set of heads and an intake but want to take a Harbor freight grinder to them...
Here is the fun part about our hobby, when you experiment and come up with working combinations, it's all smiles per mile.
Example:
Stock '69 318 only thing added was the Edelbrock 1406 4 bbl carb, 100% stock all the way down to the factory single exhaust and manifolds.
318 / 727 / 2.94 rear gears
20 mpg
Some would say that's a heavy car, it's all how you have it set up.
Enjoy Yes . . .
That's a beauty George. You can cruise to any show at 20 mpg and have lot's of fun without breaking the bank at the gas pump. A 4 barrel might give it a little more pep when you kick it in the pants but probably the same mileage and performance driving it easy. The primaries on a 600 Edelbrock are probably a touch bigger than the stock 2 barrel.
that is a nice 69.my first car was a 68 rr bought for 1800 dollars in 1970 over the year's i've had three 69 rr's and a bunch of other bb mopars. and there would be where the kick in the pant's comes in, some people are perfectly happy riding a moped and other's prefer a sreamin eagle big twin. it's all good
Dartswinger70
Well-Known Member
I had read or heard somewhere that you can slap a 4 bbl on a stock 318 2 bbl cam and heads/bottom end and it responds well. I had always yanked my stock 318 cam and ran a Summit cam, but you dont have to from what i understand.
Dan the man
Well-Known Member
Going from a 2 barrel carburetor to a 4 barrel that's properly tuned can get you up to 25 horsepower, proper ignition timing can make a extra 20 horsepower, if you go from like 0* to 16*-18* btdc you will gain more than 5 horsepower, you say only 2 on the exhaust, you must be installing your exhaust system with a hammer, if you properly install a a good free flowing exhaust system that's mandrel bent it should be good for a easy 10 horsepower. I wish that I had the dyno sheets that showed power gains with correct timing. If want you say is true then going to a 4 barrel would be a waste of time and money.That's a little generous. More like 10 5 and 2
A 4 barrel, proper advance and dual exhaust won't get you 65 horse.
Inky if your foot is opening up the secondary side. Otherwise you should get better mileage over the two barrel.
Depends on the level of performance sought.They've been listening to Uncle Tony types on the internet. the guys with a perfectly good set of heads and an intake but want to take a Harbor freight grinder to them...
But don’t you know if you say it enough times it becomes true?!?!
TT5.9mag
Two atmospheres are better than one
Back in my young and dumb days I stuck a performer rpm (non air gap) a Holley 3310, with a stock 360 cam (yanked from a truck at a junkyard!) in/on an otherwise stock 318 bottom end with 110,000 miles on it. Turns out I stumbled on a pretty decent running combo. It ran great right up till it floated the valves at 4800 rpm.
man those springs were slam wore out.
man those springs were slam wore out.
Dan the man
Well-Known Member
If 17 horsepower is all that you can get from doing those 3 things, then you are doing something wrong. A 4 barrel swap alone is worth around 15 horsepower. Read on how the guys that run totally stock engines and see what kind of power they gain, it's more than 17 for sure.
You said before that a 4 barrel is worth 25. Now which is it? I'm out of here!
Dan the man
Well-Known Member
Let me make myself more clear on this, if you convert to a 4 barrel carburetor and just bolt it on then it's at least a 15 horsepower gain, if you properly tuned it, it's good for a 25 horsepower gain. Either way, the modifications that I mentioned will make more than the 17 horsepower that you mentioned. Tuning is where it's at
Dan the man
Well-Known Member
I think that we're going mostly by personal experience. I know that each application is different and no 2 engines are a like. But, at one time I did have a dyno sheet showing the power gain from advancing the ignition timing and it was a lot more than 7 horsepower. There's so many other benefactors that can / will affect final power numbers. Also I failed to mention that I was talking about flywheel horsepower. I wasn't trying to sound like a know it all, just going by what I've seen from helping others with their cars. I still got a lot to learn
Top off the moped gas tank before you head out for the day, rumor has it they don't hold much gas.
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