Budget cylinder heads for a 318

Small Block Mopar Engine

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  1. Dan the man

    Dan the man Well-Known Member

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    Hello everybody. I've been out of the car scene for awhile and I'd like to put together a 318 for fun. Not looking for a lot of power, something like 300-325 at the flywheel. Thanks
     
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  2. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    How big a hurry you in? A lot of these guy on here took advantage of the black Friday sale on Speedmaster aluminum heads last year. @318willrun can tell you all about it. He got some. I don't know if they'll do it again, but it's right around the corner if you can wait that long.
     
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    • Dan the man

      Dan the man Well-Known Member

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      In no hurry
       
    • RustyRatRod

      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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      Then go to the Speedmaster site and read about them. They are pretty nice for the money, I believe. Maybe they will run the sale again this year.
       
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      • Dan the man

        Dan the man Well-Known Member

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        Will do, thanks
         
      • RustyRatRod

        RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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        Anytime at all.
         
      • 273

        273 Well-Known Member

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        Do you already have an engine ?
        Is Running or doing a rebuild ?
        Does it need heads ?

        a running magnum with 4bbl headers and small cam would easily get ya there

        Or here's a LA stock long block with 4bbl xe262h headers making 282 hp @ 5000 rpm add a little compression 9:1 ish maybe slight pocket porting hit the 300 hp up cam to something like xe268h for 325 ish hp. The speedmasters would be good and probably add 50 ish hp to these numbers. Don't forget stall and gears a 318 gonna need more gear than a 340/360 minimum I'd go 3.73/3.91 with 26"/27" tire size.

        318 Long Block Bolt Ons - Tech Articles - Mopar Muscle Magazine
         
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        • AJ/FormS

          AJ/FormS 68 Formua-S fastback clone 367/A833/GVod/3.55s FABO Gold Member

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          300/325 for a 318LA is no small thing. This is more than a cam swap.
          If your cylinder pressure doesn't keep up, the power will all be in the rpm....... leaving the bottom end very soft. Then you will need a hi-stall and probably 4.xx series gears to drive it at normal rpms.
          Forget putting a manual trans behind a combo like that.
          And forget running it at anything but close to sealevel. The higher you go, the weaker the pressure gets. Pressure is power, especially at lower rpms.
          To make your numbers; besides the right cam and pressure, you will need heads, headers, a free flowing exhaust, the usual bolt-ons and probably fresh air to the carb.

          IMO
          you'd be better off and bucks ahead , if you lowered your power target, or just stuffed a 360 into it. It doesn't take much for a 360 to crank out 300/325 .
          But if yur stuck on 318, then, a 5.2Magnum already has a 9/1 compression ratio, better heads, and was rated 230 NET horsepower ..... which might be closer to 270 on a dyno. With a small cam, and the usual bolt-ons, she'll be crowding your target and be ready for fun.
           
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          • Dan the man

            Dan the man Well-Known Member

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            Honestly, I'm in the planning process. I'm looking for a clean, rust free dart or duster. No project cars. Need it to have power steering and ac. I'm mainly looking for a fun car to drive and thought that a 318 could make decent power.
             
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            • Dan the man

              Dan the man Well-Known Member

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              It doesn't have to make 300 at the flywheel, I thought that would be a easy goal. If the car I find has a 318 already in it then that's good enough for me
               
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              • RustyRatRod

                RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                He's talkin outta the hole in his back side. 300-325 for a 318 at the flywheel is peanuts. Especially if you're willing to use the Speedmasters.....you can do it with stock heads too, they'll just need some work. Like porting, larger valves and things like that.
                 
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                • RustyRatRod

                  RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                  He asked about a 318. Go away.
                   
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                  • 273

                    273 Well-Known Member

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                    300 Hp is definitely obtainable that mag build makes 282 hp just add some pistons for 9:1 cr and your there add speedmaster heads and be around 350 plus hp.
                     
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                    • Dan the man

                      Dan the man Well-Known Member

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                      I haven't looked up the speedmaster cylinder heads yet, what do they cost?
                       
                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      They are 870 assembled from Summit. I don't know what the black friday deal was, but it was pretty good.
                       
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                      • Slantsix64

                        Slantsix64 Well-Known Member

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                        On a budget? just pull a 5.9 magnum out the junkyard slap some headers and a 650 cfm eddy. need a new oil pan, intake,and flywheel. timing chain cover from a LA block. Can run a electric fuel pump or buy the snout adapter to run a mechanical pump.
                         
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                        • barbee6043

                          barbee6043 barbee 6043 FABO Gold Member

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                          I saw a rust free Duster project.... I think it was 1991!!!!
                          Now days,, rust free is one someone has done all the metal work one!!!! Maybe that is what you are hinting anyway!! Good luck.
                           
                        • jammied

                          jammied Well-Known Member

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                          Budget heads either magnum or speedmaster. Pretty easy to get 300hp out of the 318 magnum. The la is going to need some work to up the compression with the speedmaster heads I think maybe 9.5:1 minimum to keep the heat in the chambers.

                          Years ago there was a article in mopar action believe it was called small block shoot out. A little old lady had a 65-66 barracuda that had a napa blue point reman 318 with some light pocket ported 318 heads and running the mopar 761 278* advertised .450/.455.something lift and was making around 300 hp. Running in the mid 13 second 1/4 mile. With a mild 2,000 converter. Can't remember the gears
                           
                        • 448Scamp

                          448Scamp Running Free

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                          The biggest problem for Speedmaster or anyone else is getting the castings. I’d be pretty surprised if they do a Black Friday sale this year. I think they got hammered pretty hard last year and this year hasn’t gotten any better. You can’t sell something you don’t have.
                           
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                          • rumblefish360

                            rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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                            I see the 318 hater is back, hating… again… not helping, just shame and woe to those that want to build a 318.

                            Yup! He is a 318 hater alright!

                             
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                            • Dan the man

                              Dan the man Well-Known Member

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                              The reason why I don't want a project car is because I don't have the extra funds to use for body work and a paint job. Now if the car would need minor interior work then possibly I would consider it.
                               
                            • Dan the man

                              Dan the man Well-Known Member

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                              I did a little research on speedmaster cylinder heads, I didn't know that they are procomp heads. I've heard that procomp heads have to be gone over before you can run them, is this true? I do have a budget that I would like to stay at, but I don't want to have to re buy parts either. My dad was a believer that cheaper is not always better. Is there any other affordable cylinder heads for a 318? Does afr make cylinder heads for it?
                               
                            • RustyRatRod

                              RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                              ANY new head should be gone over. Even the best of them. It's par for the course and if you don't do it, you'll regret it. AFR doesn't make Mopar heads to my knowledge. The best Mopar heads available now are the Trick Flows, but even those will need to be inspected. There's no way in the world I'd spend that kind of money and not have them checked over.
                               
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                              • Dan the man

                                Dan the man Well-Known Member

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                                Thanks. What I'm wanting is a car that has great throttle response, to have fun from stoplight to stoplight once in awhile. Main purpose of the car will be a semi daily driver. A cam with a noticeable idle would be good. In your opinion, would the speedmaster's or flotec heads, etc work for me in what I'm wanting to do? I'm thinking that maybe a cam with a performance range of off idle to 5,500 rpm's. Open to thoughts, suggestions.
                                 
                              • Dan the man

                                Dan the man Well-Known Member

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                                For low to midrange torque and throttle response, would 2.020" intake valve's and 190cc intake ports be to big? Is Port velocity important for low end torque and throttle response? I'm not wanting to spin the 318 over 5,500 rpm's and I was thinking that a 3.23 gear ratio would be okay. Am I going in the right direction for what I'm wanting to do?
                                 
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