225 slant rebuild for more power

Slant 6 Engines

  1. Perseus

    Perseus Member

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    Keep your slantsix basic and stock. Don't go installing speakers, amplifiers, and rewiring add ons until you know more about the electrical capabilities and inherent weaknesses in the stock wiring. There are some people on the Slant Six Forum who know some things. I'm saying this because you are very young and might want to be tempted to add this stuff too soon. Good luck with your '64 Valiant. Nice car.
     
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    • Garrett Hurley

      Garrett Hurley Active Member

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      Thi
      Alright couldn’t have asked for a better explanation from you guys. I have a daily truck so I’m in no rush to get this motor going

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      • Garrett Hurley

        Garrett Hurley Active Member

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        Step 1 complete now going to disassemble tomorrow and than going off to a machine shop this is my present this year merry Christmas you guys thanks for the help
         
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        • RustyRatRod

          RustyRatRod Weenie idiot loser. FABO Gold Member

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          Can we get some good pictures of the car? I assume it's the one in your avatar?
           
        • my68barracuda

          my68barracuda Well-Known Member

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          There are a several items on that list that have a poor benefit to cost ratio,,,
          The Mallory distributor, no vacuum advance,, expensive,,
          Just get a stock slant electronic distributor, re curve it as necessary, run a HEI ignition.

          The replacement rods and pistons,, again a lot of expense, useful in an all out race engine. But lot of folks have ran turbo power boosted slants using stock rods and pistons without rod or piston issues.

          head and main studs,, again all out race engine stuff

          are just a few of them.
          I agree with keeping your first build basic,
          Raise compression, basic bowl work, new timing chain and bearings,,,,
           
          Last edited: Dec 19, 2019
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          • RustyRatRod

            RustyRatRod Weenie idiot loser. FABO Gold Member

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            I agree with all of your points as well. The oil pump just stuck out to me, not because of cost, but because that's a major weak link for the slant six. Using the high volume oil pump greatly increases the possibility of camshaft gear and or oil pump gear failure. It's just not a great idea.
             
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            • Garrett Hurley

              Garrett Hurley Active Member

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              Yes 1964 valiant wagon v100 pushbutton

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              • Slantsix64

                Slantsix64 Well-Known Member

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                I run high volume oil pumps on my slant , and already reused it on two camshafts on the same motor in my dart no problems 50 psi cold 45 warm. Although I would not run comp cams slant six camshafts, I have a slant im building that broke off the oil pump gear straight off the camshaft.
                 
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                • kowalski440

                  kowalski440 Well-Known Member

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                • Perseus

                  Perseus Member

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                • RustyRatRod

                  RustyRatRod Weenie idiot loser. FABO Gold Member

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                • RustyRatRod

                  RustyRatRod Weenie idiot loser. FABO Gold Member

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                  You got lucky. Don't steer him in a possible wrong direction here. There have been LOTS of problems regarding this. This article is just the tip of the iceberg.

                  Title

                  To the OP, run what you want, but you'll not see me run an HV pump in a slant.
                   
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                  • 64 Dart 270

                    64 Dart 270 FABO Gold Member FABO Gold Member

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                    • KosmicKuda

                      KosmicKuda FABO Gold Member FABO Gold Member

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                      I agree AND the 225 is a low rpm engine anyway. (4-1/8 stroke) 4500-5000 and you're done.
                      There is s lot of info on slantsix.org sbout this.
                       
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                      • RustyRatRod

                        RustyRatRod Weenie idiot loser. FABO Gold Member

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                        Exactly. That's one reason why I think.....although I am going to do it, head porting isn't terribly critical. Sure it will add to......and Lord knows every bit helps, lol, but the long stroke lends itself to low RPM torque.
                         
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                        • Garrett Hurley

                          Garrett Hurley Active Member

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                          The motor is in the bed of my truck gonna take it to a machine shop after Christmas. I want to run a different cam so I’m looking for stronger valve train anybody have a link to a good kit to use and any recommendations for a more torquey cam. Going to deck the block shave the heads but run same piston assembly with new rings. I’m debating whether to go 4 or 2 barrel as well. Machine shop said $1k for complete job with a fresh Chrysler red paint job. But will need to give them the cam and valves everything else is included.
                           
                        • bestbuy19

                          bestbuy19 Active Member

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                        • bestbuy19

                          bestbuy19 Active Member

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                          I have a 67 Valiant, things I have done to mine: I installed 2-1/2 inch exhaust from the stock header to the muffler with a "Y" pipe in the front of the muffler and electronic cutout. Doesn't go any faster, but makes a lot of noise, good for parades. From the muffler to the rear bumper a 2-1/4" pipe. I have a 72 engine super six and Transmission, I rebuilt the trans myself and installed a shift kit in it. I installed a 75 "K" member with 75 lower control arms so I could put on a sway bar. I installed .89 dia. torsion bars, in case I ever install a V-8. I installed new gas powered shocks. When I bought the car, the rear fenders were already tubed 3" on each side. I put in a narrowed 8-3/4 rear end with 3.55 sure grip. I have another 3rd member with 2.93 sure grip for highway driving. When I bought the car the person I bought it from had installed 79 Volare disc brakes in front and 79 drums in the rear (10X2-1/2"). it really stops good. I have 15" slotted mags all around even the spare, 4-1/2" right hand bolt pattern. 235X50R15's on the front, 295X50R15's on the rear. There hasn't been anyone so far that can beat me across the intersection, V-6's and V-8's. Very quick off of the line and no tire spin, however when it goes into 2nd gear it chirps the tires. I have high back bucket seats and center arm rest out of a 2000 Dakota. The only 67 Valiant that I know of with 8-way power seat. I installed a electronic FM radio with blue tooth, USB and SD card for music. I have a 74 Duster seat for the rear seat. Just a fun car to drive 20191021_113333.jpg
                           
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                          • Garrett Hurley

                            Garrett Hurley Active Member

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                            That’s a bitchin ride don’t know much about rearends and gearing and what not but just takin it one step at a time.
                             
                          • KosmicKuda

                            KosmicKuda FABO Gold Member FABO Gold Member

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                            The condition of the bores will tell you (actually your machinist) whether you can keep your pistons or not. If the bores are excessively worn or scored, you will need an overbore to clean up. If you are lucky you may be able to get away with just honing, new rings, bearings.

                            Look up Oregon Cam Grinders and either send them an email or call them directly. You give them your details on what you have, gear rario, transmission, how you are going to use the car, etc. and they will recommend a couple grinds. Don't go crazy on the cam, too easy to go wild and kill the driveabilty of the car. For about $100 you send them your stock cam and they regrind it to gain power/torque. It will require new lifters (which they have) and probably a valve spring upgrade. Stock 318 or 340 springs are an upgrade over the weaker slant springs. Again, no need to go wild, a stiffer spring requires more engine power to open them and too stiff isn't necessary on your low rpm engine.

                            Being a young guy and all, you might go to Amazon and look up and buy the book written by Doug Dutra. (Doctor Dodge) He pretty much took all his knowledge and wrote THE book on slants. (SlantSixDan) is one of the contributors. I don't think Doc put all his speed secrets into the book as very little content is actually devoted to racing.

                            I would recommend concentrating on getting a good, solid, reliable engine in the car and drive it for awhile. It will tell you if anything is lacking. Don't be surprised if just driving around in that car is cool enough for you.
                             
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                            • 66 Valiant wagon

                              66 Valiant wagon Well-Known Member

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                              That's nice clean wagon! I have a 66 with the 225/903.
                              I'll be following this build for sure.
                               
                            • 6pakattack

                              6pakattack Well-Known Member

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                              I never had any problems with it, and the guy I sold it to didn't have any problems either ! Nor did I have any problems on 2 previous builds !
                               
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                              • Garrett Hurley

                                Garrett Hurley Active Member

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                                I’m looking for an intake right now I’m thinking Aussie speed long runner 2 barrel and Holley 350 avenger. I think this will be a good combo for the regrinded cam new lifters and 318 springs. Going to deck the block shave the heads and new rings and bearing hopefully I can use the same pistons they haven’t got back to me yet. I haven’t even thought about carbs and linkage yet but I know jack about carbs so please hit me with some knowledge thanks guys hope you all had good holidays.
                                 
                              • Slantsix64

                                Slantsix64 Well-Known Member

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                                Intake i would say super six or offy four barrel intak, kickdown and throttle cable will also need to be redone early veight darts barracuda valiants or slant six would have the throttle cable pedal that bolts in your wagon
                                 
                              • Garrett Hurley

                                Garrett Hurley Active Member

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                                I just love the look of those long runners especially on a wagon like mine. Debating whether to go eddy 500 cfm or Holley 390 either on Aussie long runner or Offy intake.
                                 
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