318 with 360 heads and compcam build help

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CLAY72dart said:
I have a ford 9in rear that’s 3.5:1 and I want a na 318 in just looking for a good performance motor from a roll I would like to keep the stock converter and the 904 trans I have I can add a shift kit if necessary I just didn’t do that when I built it the first time. I’m just looking for a good reliable performance motor. Nothing crazy I would like to use my 4 barrel intake and a 750
CFM carb obviously I can rejet it if necessary. I want the 318 but I don’t have to have 318 heads I want to keep the rotating assembly but will change piston heads. If that puts it in perspective.
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So your gonna be rebuilding this 318 ?

Stock 318 heads are more than capable to make 280-300 hp above that mods or better heads are needed.

Since you want a mild driver which is like a 250-280 hp 318 engine.

All you need for that 4bbl, mild cam, 9:1 ish cr, duals, headers be a bonus and a good tune. With decent gears and shift kit should be a fun ride.
 
Siksty7 Dart 270 said:
Changing to magnum heads is a little complicated because they oil differently than LA heads. You can stay with your 360 heads and probably see similar results to mine with a similar cam, good intake, and carb. The stage 1 shift kit was well worth the low money investment, it gives a shift that means business but doesn't give you whiplash.
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Okay I’ll put the kit on the list but I’ll wait to buy it until I know what I need.
 
273 said:
So your gonna be rebuilding this 318 ?

Stock 318 heads are more than capable to make 280-300 hp above that mods or better heads are needed.

Since you want a mild driver which is like a 250-280 hp 318 engine.

All you need for that 4bbl, mild cam, 9:1 ish cr, duals, headers be a bonus and a good tune. With decent gears and shift kit should be a fun ride.
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Yes I want to rebuild the 318. Right now I have the 4barrel intake and carb and the headers with a true dual flow master exh. I just picked up the gears and I’ll look into the shift kit. I’ve just got a lot of different parts so I was looking for the best bang for my buck if that makes sense. I don’t want to be running from the police or have something my wife can’t drive but I would like to spin the tires and be able to be the first from a light if I want to.
 
CLAY72dart said:
Here is everything mopar I have.
I have a 750 edelbrock carb
750 Holley x2
China 4 barrel intake
360 stopped block
360 heads 1/2 stripped
Running stock 318
273 motor and heads
Msd distributor
Msd box x2
3 904 transmissions
One 904 is rebuilt and has the red eagle clutches
Ford 9in rear at 3.5:1 ratio
Stock 7.25 rear the shitty little thing
I have a entire disc brake kit
I have a 70 swinger and a 72 dart custom
Custom is the parts car for the swinger
I have that huge cam kit
With some rods for the adjustable heads
I have a full exhaust I got made at a shop that connects to the little hugger headers
I have 3 sets of stock manifolds
I have other little stuff but it doesn’t play into the conversation.
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What year 273? Head casting numbers? Adjustable rockers? Not sure I'd run the 9" ford rear. Not a fan of MSD, does your car have the original electronic ignition? So we have a running driving 318 and 904 transmission in the swinger? Exhaust sounds like a done deal.
 
I don’t
66fs said:
What year 273? Head casting numbers? Adjustable rockers? Not sure I'd run the 9" ford rear. Not a fan of MSD, does your car have the original electronic ignition? So we have a running driving 318 and 904 transmission in the swinger? Exhaust sounds like a done deal.
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I can get the numbers off the 273 today it’s a little weird it’s got 318 written on it and the stamped crossed out and 273 stamped next to it but I will get the numbers for you. No adjustable rockers. I’m set on the ford 9in rear vs a 7 1/4 rear. I have the original ignition but I want the Msd distributor at least. Don’t have to have the box I’ve had a street fire die on me before. And yes the 318 was a running driving 318 with a 904 trans before I pulled it to put it in the swinger from my custom. I also have an aluminum radiator I would like to go back to.
 
CLAY72dart said:
I don’t

I can get the numbers off the 273 today it’s a little weird it’s got 318 written on it and the stamped crossed out and 273 stamped next to it but I will get the numbers for you. No adjustable rockers. I’m set on the ford 9in rear vs a 7 1/4 rear. I have the original ignition but I want the Msd distributor at least. Don’t have to have the box I’ve had a street fire die on me before. And yes the 318 was a running driving 318 with a 904 trans before I pulled it to put it in the swinger from my custom. I also have an aluminum radiator I would like to go back to.
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What will it take to run the 9" Ford? Is it custom built for an A-Body Mopar? Custom drive shaft? 273 sounds funky is 273 cast in the outside of the block?
 
66fs said:
What will it take to run the 9" Ford? Is it custom built for an A-Body Mopar? Custom drive shaft? 273 sounds funky is 273 cast in the outside of the block?
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Got no clue but I got a welder and commitment. And the driveshaft will have to be cut either way because the customs driveshaft was longer I think.
 
CLAY72dart said:
Yes I want to rebuild the 318. Right now I have the 4barrel intake and carb and the headers with a true dual flow master exh. I just picked up the gears and I’ll look into the shift kit. I’ve just got a lot of different parts so I was looking for the best bang for my buck if that makes sense. I don’t want to be running from the police or have something my wife can’t drive but I would like to spin the tires and be able to be the first from a light if I want to.
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Sounds like your 90% the way there, just make sure you got decent cr around 9:1 and I would shop for cams with a intake duration around 205 to 212 @ 0.050". Pick a few and people can help you narrow it from there, when in doubt buy the smaller one.
 
66fs said:
What year 273? Head casting numbers? Adjustable rockers? Not sure I'd run the 9" ford rear. Not a fan of MSD, does your car have the original electronic ignition? So we have a running driving 318 and 904 transmission in the swinger? Exhaust sounds like a done deal.
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273 numbers are
2806030-1
Also has 2/25/66

Heads are what looks like
2843675-12
P
Has a 1.78 intake and a 1.5 exh
 
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CLAY72dart said:
I guess bigger isn’t always better.
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Especially if your not gonna run the right cr, stall and gears.
Especially with smaller displacement engine.

Good thing about low cr 2bbl V8, is the 1st 50-100 hp above stock (150-200 hp) isn't too hard to get aka 4bbl headers and cam good tune above that become harder ($$$) and generally less streetable.

The two main components to make power are cam and heads, Heads basically set the engines potential and the cam among other things decides how much of that potential is gonna be realized. But cam is generally gonna effect how the engine behaves (streetablity) more than everything else.
 
273 said:
Especially if your not gonna run the right cr, stall and gears.
Especially with smaller displacement engine.

Good thing about low cr 2bbl V8, is the 1st 50-100 hp above stock (150-200 hp) isn't too hard to get aka 4bbl headers and cam good tune above that become harder ($$$) and generally less streetable.

The two main components to make power are cam and heads, Heads basically set the engines potential and the cam among other things decides how much of that potential is gonna be realized. But cam is generally gonna effect how the engine behaves (streetablity) more than everything else.
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Yeah like I said I don’t want anything crazy just some more hp and was wondering what heads I should use and what cam and pistons.
 
CLAY72dart said:
Yeah like I said I don’t want anything crazy just some more hp and was wondering what heads I should use and what cam and pistons.
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318 heads are more than capable to make the power you want but so are 360 heads with the right cr, there's no overly wrong choice, 360 heads will need less cam to make same power as the 318 heads or more power (probably 30-40 ish hp) with the same cam.

It's up to you, since your rebuilding I'd probably go with something like KB piston's zero deck it and do the 360 heads, that way the engine has room for growth.
 
273 said:
318 heads are more than capable to make the power you want but so are 360 heads with the right cr, there's no overly wrong choice, 360 heads will need less cam to make same power as the 318 heads or more power (probably 30-40 ish hp) with the same cam.

It's up to you, since your rebuilding I'd probably go with something like KB piston's zero deck it and do the 360 heads, that way the engine has room for growth.
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I’ll look into it thanks for your help.
 
CLAY72dart said:
273 numbers are
2806030-1
Also has 2/25/66

Heads are what looks like
2843675-12
P
Has a 1.78 intake and a 1.5 exh
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block could be 273 or 318. What bore diameter? Maybe a thick wall 318? On the other side of the bock say 273 or 318? 675 heads are 68 up 318 open chamber heads, no joy there.
 
If you want your stock 318 to run high performance, read 318willrun posts and take it to the bank. You are wasting a lot of time and money going helter skelter. I'd sell all your 750 carbs and get one good 650 ish Edelbrock AFB or AVS 2 and a cam and valve springs to work with what you have.
 
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junkyardhero said:
can you expound on this? i don't understand. specifically what do you mean by "clean up the short side radius"? how is this done and what are the benefits.

be as detailed as possible, so that i and others can follow.
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And like the math teachers said show your work
 
Dan the man said:
I think that you probably understand what I was trying to say, I don't know all the exact terminology names
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it was for the edification of those following along that may not know what you were referring to.

normally, it's not great practice to just spout off information without being specific, especially if you don't know what you're talking about.

kind of like jumping into a thread to try and contribute without having read any of the thread...
 
Most people are unwilling and or capable to port their own heads and if they are they probably wouldn't be asking us how to put together a mild build. Even if someone is willing don't mean their gonna get great results, not trying to discourage anyone from porting but it's gonna be an experiment and gamble not necessarily a guarantee result.

Why I think it's ridiculous to push a ported 273/318 heads over somekind of 340/360 head if the OP's need more than a 318 head will offer.
 
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