Budget cylinder heads for a 318

Small Block Mopar Engine

Thread Status:
Not open for further replies.
  1. dirty white boy

    dirty white boy 50 yr old Juvenal delinquent

    Messages:
    1,737
    Likes Received:
    1139
    Joined:
    Dec 15, 2012
    Location:
    stoneville n.c.
    Local Time:
    4:37 AM
  2. 273

    273 Well-Known Member

    Messages:
    3,790
    Likes Received:
    1539
    Joined:
    May 14, 2012
    Location:
    Ontario
    Local Time:
    5:37 AM
    I agree with the stall and gear recommend, to me that's the main problem with smaller displacement you need deeper gears in a world where most want to run 3.55 at most, that's why my signature says "If your willing to gear it build it if not build a larger displacement, Or take solace in your compromises."

    I don't know about "325hp out of a 318 ain't no small thing" guess depends what you mean, it's just cam 4bbl headers and a bump in cr away to me that's basic hot rodding build but yes stock 318 heads make you run a little larger cam than you'd need with even 1.88 360 heads, but it don't need big heads it's just dollar wise for most it's don't make sense to put money into stock heads of any kind why people are saying cheap aluminum heads not cause he needs them but there price so it's hard not to. And yes the OP should at least bump cr up to 9:1.
     
  3. AJ/FormS

    AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s FABO Gold Member

    Messages:
    22,043
    Likes Received:
    9218
    Joined:
    Jan 19, 2014
    Location:
    South-Central Manitoba,Canada, 900ftelevation
    Local Time:
    4:37 AM
    "325hp out of a 318 ain't no small thing", means; principally, that it costs money. and with bolt-ons, as you know, the fun-factor is delayed..... unless you spend even more money now on the chassis.
     
  4. 273

    273 Well-Known Member

    Messages:
    3,790
    Likes Received:
    1539
    Joined:
    May 14, 2012
    Location:
    Ontario
    Local Time:
    5:37 AM
    325 hp 318 stock heads = 9:1 xe268h 4bbl headers
    325 hp 360 stock heads = 9:1 xe256h 4bbl headers
    Where the extra expense ?? beside 360 would have slightly cheaper pistons
    Give them both the same heads and 318 would need less cam probably the same cam as the 360.

    The OP still hasn't shown any desire to build a 360 why push it ??
    would a 360 make slightly more power in a streetable powerband like idle-5200 rpm = yes
    if built to make the same power would the 360 be slightly more streetable since = yes
    will the 360 need less stall and gear = yes
    at 325 hp does it matter all that much = no
    if the OP is ok with this why can't you be ???
     
  5. RammerJammer75

    RammerJammer75 Well-Known Member

    Messages:
    1,362
    Likes Received:
    1720
    Joined:
    Aug 28, 2020
    Location:
    Kingsport, TN
    Local Time:
    5:37 AM
    He hates 318s :rofl:
     
    • Like Like x 1
    • Agree Agree x 1
    • MOPAROFFICIAL

      MOPAROFFICIAL FABO Gold Member FABO Gold Member

      Messages:
      9,946
      Likes Received:
      9256
      Joined:
      Jun 1, 2016
      Location:
      Oceanside ca.
      Local Time:
      2:37 AM
      Just pretend I'm drinking a beer and rambling off my thoughts on it...cause I am.:D
      I see your point. LS have a better port, its tall n skinny and velocity is abundant flowing 300's cfm vs sheistmaster.
      I threw bait out there for the age old debate if when everyone used to say NOT to use 360 heads. "Kills the bottom end"
      "kills the cyl pressure"
      And so on...@160cc...175@.300
      Why am I picking .300 lift?
      Because it's a real good indicator of how well the head will do on average and the valve spends a good amount of time there x2 compared to peak. Ok...
      So...Now its let's put some sheistmaster 170's something cc ports on that do 175cfm@.300 as well... see?
      Now I went with 175 on the j head.1.88 though I've seen a few more on 2.02 version. You get a 65cc chamber, or 68cc after minor seat blending and a new valve job.. that's stock 675 318@68cc
      ..but back to the comparison..The sheistmasters need a valve job to flow any better till .475- .500 lift. Yes they do 240's ootb..but lag below that and run with a regular iron head that is less port/more velocity.
      Yes you can use'em, have the valve job fixed. Would it show a difference in the low end and over all snap of the throttle and any rpm..I believe it would.
      Its basic.
      2 ports...
      One 15cc bigger than the factory designed port.
      If both flow near the same, which makes more power?
      Which would put you back in your seat more?
      It's not always the cheaper route and not always the way to go..
      But imo it's the truth. 160cc is already a jump from 125cc and I have ported a lot of 318 heads to 360 flow numbers and ridden in the cars that have'em. They amazingly pull hard @132-134cc port 175cfm@.300 199cfm@.400 204-210cfm@.500.
      There is a close relation to rpm/cid with port volume when it comes to efficiency and torque.
       
      Last edited: Aug 27, 2021
      • Like Like x 2
      • Agree Agree x 1
      • MOPAROFFICIAL

        MOPAROFFICIAL FABO Gold Member FABO Gold Member

        Messages:
        9,946
        Likes Received:
        9256
        Joined:
        Jun 1, 2016
        Location:
        Oceanside ca.
        Local Time:
        2:37 AM
        He doesn't need 4.10 gears.

        3.73
        Regular old 2400 stall 'cut' convertor you can get anywhere for 200 bucks.
        good vj 360 heads with .025 milled off to make them 67cc would work great.

        Might not be the cheap route or best future potential, but it's the right size shoe for the foot.
        Build it for what it's for... not for what it "might be"
         
        • Like Like x 2
        • Agree Agree x 1
        • jammied

          jammied Well-Known Member

          Messages:
          237
          Likes Received:
          91
          Joined:
          Oct 16, 2015
          Location:
          wyoming
          Local Time:
          3:37 AM
          I agree ... for a 318 use the old 302 castings 1.88 valves or so and some good pocket porting/bowl blending pretty hard to beat. Now when the magnum heads came out they are a out of the box performance head for a 318 and probably the best out of the box 318 head. And without a doubt the best performing factory 318's the factory ever put out. I'm not so sure that the 360 magnum is the best performing factory 360. But that's a different topic

          Almost all small block mopar parts available are centered around a 340/360
           
        • 273

          273 Well-Known Member

          Messages:
          3,790
          Likes Received:
          1539
          Joined:
          May 14, 2012
          Location:
          Ontario
          Local Time:
          5:37 AM
          Problem with 302 heads not many are into porting so the 302 offers very little in performance gain over stock for most.

          Plus 273/318 heads was designed for 273 in mind and not as a performance head. 273 head volume and cfm is in similar ratio with 273 displacement as a X is with a 340, a 318 is 47 cid bigger than a 273 and 22 cid smaller than a 340 less so after an overbore. A 1.88 360 heads would be closer to right if you kept volume and cfm ratio for the 318 the same as 273 and 340.

          With and overbore a 318 is 12-17 cid less than a 340 and 0.060”-0.030” smaller than the so called magic 4” bore can see these aftermarket heads being that far off. Not needed for 300-325 hp but for the money can’t see a reason not to. But yes a 1.88 360 or a ported 1.88 302 or magnum heads would right inline with 300-350 hp 318.
           
          • Like Like x 1
          • dirty white boy

            dirty white boy 50 yr old Juvenal delinquent

            Messages:
            1,737
            Likes Received:
            1139
            Joined:
            Dec 15, 2012
            Location:
            stoneville n.c.
            Local Time:
            4:37 AM
            302 heads should make 325 hp without porting if rest the engine is built right....easy!
             
          • 273

            273 Well-Known Member

            Messages:
            3,790
            Likes Received:
            1539
            Joined:
            May 14, 2012
            Location:
            Ontario
            Local Time:
            5:37 AM
            I agree, so can the head that come with the 318 he buys, unless he wants to build quench for a 300-325 hp motor there’s little point in them. A 1.88 360 will make 300-325 hp with a lot less cam than the stock 318 or 302 heads making for a more mild and streetable combo. Plus if you buy the right piston you still can build quench if one chooses with the 360 heads.
             
          • jammied

            jammied Well-Known Member

            Messages:
            237
            Likes Received:
            91
            Joined:
            Oct 16, 2015
            Location:
            wyoming
            Local Time:
            3:37 AM
            Indy does bowl work for $150 a head add $150 a head into a good 3 angle valve job from them. Or just get magnum heads and a good valve job. IMHO those are the best options for a 318. For a budget head. You would have to go with a step top piston with 360 heads. And that's fine other than adding rotating mass. Or get the edelbrock magnum heads. But with 2.02 valves in less than a 4" bore valve shrouding becomes a issue and it gets to a point of diminishing returns.

            I think we should start a group build gather up donations and heads and send to holdner to do the dyno with same engine and cam just different heads.
             
          • jammied

            jammied Well-Known Member

            Messages:
            237
            Likes Received:
            91
            Joined:
            Oct 16, 2015
            Location:
            wyoming
            Local Time:
            3:37 AM
            Heck I got a 318 magnum test mule icould throw in
             
          • rumblefish360

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

            Messages:
            42,214
            Likes Received:
            14385
            Joined:
            Jun 21, 2005
            Location:
            Florida
            Local Time:
            5:37 AM
            The 318 hater speaks again!
            It’s the same cost to build minus pistons if so the route goes.
            It doesn’t take as much cam as others have listed and think it does.
             
          • 273

            273 Well-Known Member

            Messages:
            3,790
            Likes Received:
            1539
            Joined:
            May 14, 2012
            Location:
            Ontario
            Local Time:
            5:37 AM
            he wants a 5.2 magnum to do comparison to the 5.9
             
          • Dan the man

            Dan the man Well-Known Member

            Messages:
            331
            Likes Received:
            97
            Joined:
            Aug 1, 2014
            Location:
            missouri
            Local Time:
            4:37 AM
            Why did my post lose 5 pages of information?
             
          • Dan the man

            Dan the man Well-Known Member

            Messages:
            331
            Likes Received:
            97
            Joined:
            Aug 1, 2014
            Location:
            missouri
            Local Time:
            4:37 AM
            What would be the best bolt ons for a good running 318?
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

            Messages:
            9,946
            Likes Received:
            9256
            Joined:
            Jun 1, 2016
            Location:
            Oceanside ca.
            Local Time:
            2:37 AM
            It looks like we lost a bunch of post from August 28th
             
          • Dan the man

            Dan the man Well-Known Member

            Messages:
            331
            Likes Received:
            97
            Joined:
            Aug 1, 2014
            Location:
            missouri
            Local Time:
            4:37 AM
            We sure did and I don't know why. Guess it's one of those things.
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

            Messages:
            9,946
            Likes Received:
            9256
            Joined:
            Jun 1, 2016
            Location:
            Oceanside ca.
            Local Time:
            2:37 AM
            And the 7th
             
          • RustyRatRod

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

            Messages:
            81,267
            Likes Received:
            60773
            Joined:
            Jun 7, 2010
            Location:
            Georgia
            Local Time:
            5:37 AM
            They upgraded the server and something got corrupt somehow and they had to use a backup all the way back to the 27th. So everything after that is gone. Don't know if they can retrieve it or not.
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

            Messages:
            9,946
            Likes Received:
            9256
            Joined:
            Jun 1, 2016
            Location:
            Oceanside ca.
            Local Time:
            2:37 AM
            Damn
             
          • Dan the man

            Dan the man Well-Known Member

            Messages:
            331
            Likes Received:
            97
            Joined:
            Aug 1, 2014
            Location:
            missouri
            Local Time:
            4:37 AM
            Thanks for explaining it to me
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

            Messages:
            9,946
            Likes Received:
            9256
            Joined:
            Jun 1, 2016
            Location:
            Oceanside ca.
            Local Time:
            2:37 AM
            I lost my paid for on the 3rd or 4th gold member status.
             
          • RustyRatRod

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

            Messages:
            81,267
            Likes Received:
            60773
            Joined:
            Jun 7, 2010
            Location:
            Georgia
            Local Time:
            5:37 AM
            Sho nuff.
             
          Thread Status:
          Not open for further replies.
          1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
            By continuing to use this site, you are consenting to our use of cookies.