318 heads. whats your route??

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Mopar318Guy

bear jew
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what kinda heads would you put on a 318 if you were goin with a 509/292 cam and flat top pistons. ive heard alot of good things about 360 heads. what casting number 360 heads and if u went with a 318/340 head what would be the best one. mine are 4027598. 1.88/1.60 valves. 65 to 71.5 cc heads. idk what they are yet. im thinking of milling down a set of 360 heads and puttin m on. but im also thinkin of just port polishing the 318 heads i have. milling them down too.
 
Mopar318Guy said:
what kinda heads would you put on a 318 if you were goin with a 509/292 cam and flat top pistons. ive heard alot of good things about 360 heads. what casting number 360 heads and if u went with a 318/340 head what would be the best one. mine are 4027598. 1.88/1.60 valves. 65 to 71.5 cc heads. idk what they are yet. im thinking of milling down a set of 360 heads and puttin m on. but im also thinkin of just port polishing the 318 heads i have. milling them down too.
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The heads you have are just fine!

I have learned a thing or two recently when I had some heads redone. BJR Racing is a member here and he would be the one you need to talk to explain a bit better. But the smaller valve keeps the port velocity up which is good rather than the 2.02 intake valve.

That cam likes alot of compression... what will be your compression you will run?
 
i have a 1992 318 magnum straight out of a dakota sport...

what size would the stock valves be? any good advice on getting some power out of that engine...

I'm planning on putting it and the tranny in my 71dart..

as far as a build up of the engine, probably go with a mild cam near .480 lift, underdrive pulleys, and probably mill the heads .020 or so to up the compression a lil, and a set of mid-length headers, and a mopar computer..
 
MP318guy, the 360 heads would be the cheapest way out and probably make some decent power up top. Porting a 318 head would be casting number dependent for me. I do not know all the in's and outs of the 318 heads.

KYdart, that is pairateing a thread. Better to have started your own.

Stock valves are good for the teen @ 1.92/1.60 (Or was that 1.94, danmmmm) Your on track for a good power build. I'd just do full length headers rather than what you mention.
 
First of all the question would be how high are you planning on turning the engine? This will determine the port volume and valve size.

For street or street strip the std. 318 heads will be best with std. valve sizes. Then for high RPM's I would then use the 1.88/1.60 360 heads, as the port volume is 25-30 cc's larger from the factory, and the magnums are larger than this, with larger valves the valves being 1.92 and 1.625.
 
Well he plans on going after big blocks so i'd say use the 340/360 head if you want to make any real power...
 
Useing a 318 to go after big blocks is like taking a knife to a gun fight, IMO. 500 HP or just over is about all your going to get with a 318 NA and well built, most well built big blocks will make 800 - 1,000 HP so it's kind of crazy to even try to do this. Although he may have a chance with a turbo or supercharger and NOS but then how long will it last at this kind of HP. Then it will take a Pro built chassis to handle it. And this won't be streetable.

Tim Lynch has about the strongest small block that I've ever seen and it makes around 1800 HP with a race turbo and runs 4.20's 1/8 mi. I believe it's a 347 ford but it's also in a Pro Stock chassis. I believe he has 100 - 150 K in it. But I'm not sure. And he competes with some of Sonny's 700-800 CI engines with NOS.
 
BJR Racing said:
First of all the question would be how high are you planning on turning the engine? This will determine the port volume and valve size.

For street or street strip the std. 318 heads will be best with std. valve sizes. Then for high RPM's I would then use the 1.88/1.60 360 heads, as the port volume is 25-30 cc's larger from the factory, and the magnums are larger than this, with larger valves the valves being 1.92 and 1.625.
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the heads i have a 598s. 1.88 1.60 valves already. im leaning towards port polishing the heads. there basically 360 heads from what i heard. im not sure
 
M318guy,
Your correct that they are 360 heads.early to mid 70's. I would just gasket match and bowl blend them and they will be more than what most 318's can use.
 
BJR Racing said:
M318guy,
Your correct that they are 360 heads.early to mid 70's. I would just gasket match and bowl blend them and they will be more than what most 318's can use.
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bowl blend eh? id try to do it myself but i dont want to mess up my heads. more then they can use? how much hp do u think these will get me over stock 318 heads? i guess when i get them port polished i could get the bowl blend done. i just searched it. sounds complicated. but worth it. alott more air flow. hopefully i can start rebuilding my 318 soon. im goin for balls out hp. cheap tricks. anyway i can get the power.
 
Mopar318Guy said:
im goin for balls out hp. cheap tricks. anyway i can get the power.
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Unless you are really into 318s or just got to have a 318 for some reason I wouldn't rebuild it. You need to go with a 360 ( longer stroke than the 318 ) or a big block. The money you will spend rebuilding the 318 could go toward a 360 and you will enjoy it much better because it will make more horses/torque. Don't forget about torque!

I had a 273 and it was bored .060 over had it cammed up,performer intake,Eddy carb etc... and it never had the power or torque I wanted. I now have a 360 (couldn't afford stroked yet) on the engine stand awaiting to go in to replace the 273. You wouldn't need a entire motor because you could use your 1.88/1.60 heads on the 360. You will have to get a different oil pan to fit the 360 because it is different from 273,318,340 but other than that you will be on your way.
 
340srule said:
Sorry not from a 318,not unless you spend some serious money...
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i like how everyime i get an idea everyones gotta put me down. im not a frickin dog. 318s make good power. and they can rev to 8 grand. im NOT getting another motor. this is NOT about takin a cheap faggish route and gettin a new motor. 318 stays. and when its makin 350+ hp ill go ahead and just cut your dreams down. ya know. dont be such a downer
 
if your only looking for 350ish hp you will be fine with the 318 dont get me wrong im not saying 350 hp isnt much im just saying thats very doable with a 318 if that is what you want and since you already have the 318 you wouldnt need to spend anymore money for the 360 but if you are looking to go up from there you would then maybe want to think about the 360 bottom end i have seen to many guys only need x amount of power and that will satisfy them but they get it done and that is not enough anymore and then the 318 wont really handle what they wanted to do with it im not trying to discourage you just want you to think about it all before you spend your money. But again the 318 will surely do what you are looking for so if you are gonna stay happy with that power i say go for it and listen to what bjr has to say i havent dealt with him personally but he seems very knowledgeable and will be able to help you out alot good luck with your build Justin
 
318Guy,
This is what I would do with the 318, I would get a set of KB 167 pistons, a set of roller rockers 1.5 and pushrods to give you a fully adjustable valvetrain. I would get a XE274 cam or the equiviliant from whom ever you choose. I would also use a M-1 intake with a 750VS carb. I would gasket match the 318 heads and bowl blend them useing the stock size valves and do a good valve job on the heads, use 1 5/8 hedders and good set of free flowing mufflers and you should be able to get 400 or so HP out of it. Just make sure when you get your cam that you get the correct springs and parts for the engine. This should give you a good start as to where to get headed to.
 
Mopar318Guy said:
i like how everyime i get an idea everyones gotta put me down. im not a frickin dog. 318s make good power. and they can rev to 8 grand. im NOT getting another motor. this is NOT about takin a cheap faggish route and gettin a new motor. 318 stays. and when its makin 350+ hp ill go ahead and just cut your dreams down. ya know. dont be such a downer
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There is no one putting you down. It is only a suggestion that you switch to a 360 or big block. If all you want is 350 hp area then the best thing to do is keep the 318. Yes you can even get 400 hp from the 318 but don't forget about torque. The 318 will not make as much torque. I and others want more torque. Torque = fun!

Why rev a motor 8 grand when you can get the same amount of hp/tq from less RPM from a 360 or big block?

It's not a faggish way of doing anything. If so my friend there is sure a lot of **** here at FABO. I've seen countless members remove their 273,318 and go with the 360, stroked 360 or big block. Its the smart thing to do rather than spend the same amount of money on small bore, short stroke 318.
 
Geez..never thought of my 520 + h.p. 416 stroker as a fag motor..lol..thats what replaced the 318 that came in my duster.because i knew the 318 would'nt get it done,good luck with those big blocks...
 
I think the REAL isssue here is that HE DOES NOT WANT a 340/360. Yes, we all know a 340/360 is going to give him more output in the longrun, but sometimes some of us, including me, do not want a 340/360 for a current build.

If all you want is 350-400HP I will say that a 318 is a motor that is very capable of getting into those numbers, but to agree with some of the others you will have to realize that it just will not make the torque that you will need for those killer hole shots. Also, remember to follow up with a good torque converter, as you will need it, and a stiff rearend. This will help offset the low torque numbers out of the 318 a little. Follow Bobby's(BJR) build suggestions and you will come out just fine, IF that is the route you want to go.

The last thing I have to say is that you gotta check your attitude at the door if you want to keep getting suggestions from some of these guys. You come on a site as a fairly new member ask for suggestions, get them, and then get pissy because they tell you what you don't want to hear. This just isn't going to cut it for long around here, and this is the second thread in a week that you've done it in. Most of these guys are just trying to throw out alternatives to what you are doing, you may not like it and that's fine, but remember, YOU are the one who asked for help here. AND, most of these guys are giving you input that is time tested and tried and true, so try to be somewhat respectful when all that they have done is give out the advice that YOU asked for.
 
340srule said:
Geez..never thought of my 520 + h.p. 416 stroker as a fag motor..lol..thats what replaced the 318 that came in my duster.because i knew the 318 would'nt get it done,good luck with those big blocks...
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I don't think your 416 stroker is a fag motor 340srule. :-D
 
What's so wrong with 318's? If you aren't trying to be Larry Morgan, they are a very good choice for a mild fun street car. As for no power potential, if you build them right, they are a lot of fun. I've beaten 340's and 360's with mine because of they were overcammed,overcarbureted,and undergeared. My only suggestion is to build a engine with good machine work and try to resist overcamming it. As far as it being a waste of time and money to build a 318, just think of the guys out there building slant 6 engines and being happy with that....To each their own. Not everyone wants or can afford an Indy Legend crate hemi! The BJR buildup sounds good to me. Let us know how it works out. AND for you hecklers, his avitar handle is Mopar 318 guy, doesn't that say it all?
 
Mopar318Guy,
Take a look at my 322 engine in the tech archives, this will give you a very good insite to what your looking for. You don't have to do the rods like I did but if you follow the rest with exception of the cam your results will be somewhat close. Also too you don't have to cut the deck this much but, as I did it for racing, but you'll get the jist of the engine, and still have your 318.
 
I kept the 318 in my duster really because I like it more when the car has the original engine. Just means more to me for some reason. Mine is built up and I would put it making someplace close to 300hp at the crank. It wasn't all that expensive either. It shouldn't be much of a problem getting 350hp give or take. They are good motors, and it is true that more cubes are an advantage and will give more power. But it's always cool to tell people you have a little 318 when they think you have a 360. I get that all the
time.

The heads I have are the stock 318 heads and valves. I didn't want to spend the money on 360 or 340 heads. The guy who built my engine port and polished them and did a 3-angle valve job. Couldn't tell you just how much more power they gave me but wouldn't flow as good as say a 340 head would.
 
Do what you like with YOUR car. I put together a budget 318 about 11 years ago for a station wagon I had- was not a drag machine with nicely done J-heads, a 268 cam, M-1 dual plane, 650 Edelbrock carb, headers, and a 3.23 sure-grip. Helluva highway car for Eastern Washington, though! I'd try the '85-up "302" cast heads...they litter the yards, they only require a little gasket matching (swirl port design), and they'll keep your 'budget' vibe/'bang-for-the-buck' theme.
 
Geez..never thought of my 520 + h.p. 416 stroker as a fag motor..lol..
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mullinax95 said:
I don't think your 416 stroker is a fag motor 340srule. :-D
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LOL I though thought it a F.A.G. motor.

(Freakin Angry Gorrrrrilla! LOL :munky2:)

Is that 416 / 525 Dyno proven?

What ceiling did you hit with the 340 that made you stroke it?
 
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