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  • The Pontiac OHC Six

    Some day this will have a car wrapped around it until then it'll have it's own thread :P

    So I bought a new engine stand because I did not trust the three wheeled one I own (on top of Squirrel's concerns too) and unloaded the engine into the carport after work today. The trick was to do it without having to haul the heavy engine hoist up from the basement.

    Backed the trailer into the carport.


    Some ratchet straps from the carport support beams ;D I wouldn't really trust the straps or beam with a 455, and the straps made me a tad nervous with this thing :-\ Lifted the engine hoist up and bolted it to the engine.




    The intake/exhaust side.


    The MIGHTY one barrel carb :P


    A 1969 4.1L Code. The Date code says December 1968.




    The accessory side.


    What paint scheme to go with eventually?


    The accessory block. Has the Distributor, Oil and Fuel Pumps.


    You can see the slots where it bolts up, it's how the timing belt is tightened.




    Oil's full, engine turns easily. I think I'll pull the distributor, get a drill and test the oil pressure.


    Big Ol' Cam Sprocket.


    The Accessory drive sprocket.



    Two things stand out to me that make me wonder what I'll find inside. Squirrel had pointed out that there was a paint job done over the original paint (the blue is the wrong blue too) AND the Freeze Plugs are NOT painted, which I find real interesting because it means some care was taken at some point and not a simple rattle can rebuild.
    Escaped on a technicality.

  • #2

    Re: The Pontiac OHC Six

    Re: The Pontiac OHC Six

    No, it was a rattle can rebuild. If it had been hot tanked the original paint would be gone. It just means that someone changed the freeze plugs after painting it.

    So, when will we see how far the 292 crank is from fitting in there? at least it won't interfere with the cam or the oil pump!

    My fabulous web page

    "If it don't go, chrome it!" --Stroker McGurk

    Comment


    • #3

      Re: The Pontiac OHC Six

      Re: The Pontiac OHC Six

      Hmm. Anyways, it'll likely be after Thanksgiving. I have to change the pinion seal on the Skylark (yup, source of the oil) before going to CA for Thanksgiving.
      Escaped on a technicality.

      Comment


      • #4

        Re: The Pontiac OHC Six

        Re: The Pontiac OHC Six


        The accessory side.


        What is that black tube and block near the back of the engine?

        Didn't they have a 4 bbl version of this too?
        BS'er formally known as Rebeldryver

        Resident Instigator

        sigpic

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        • #5

          Re: The Pontiac OHC Six

          Re: The Pontiac OHC Six

          looks like the oil filler.

          Comment


          • #6

            Re: The Pontiac OHC Six

            Re: The Pontiac OHC Six

            Awesome. Another inliner. I always thought this would be a cool engine to put into...something. There was a guy with a cherry 67 Lemans Sprint with this OHC six I used see all the time at a local show. Really cool.

            It looks alot like the Chevy 230/250 but if I remember correctly there are many small differences. Not sure if the intakes/exhausts interchange?
            1967 Chevelle 300 2 Door Post. No factory options. 250 ci inline six with lump-ported head, big valves, Offy intake and 500cfm Edelbrock carb.

            Comment


            • #7

              Re: The Pontiac OHC Six

              Re: The Pontiac OHC Six

              Nice work Randal!

              This thread has epic potential - I've never seen one of these and I'm sure I'm not the only one that will be checking back often to see how this inline monster progresses.

              Good call on the four wheel engine stand.
              There's always something new to learn.

              Comment


              • #8

                Re: The Pontiac OHC Six

                Re: The Pontiac OHC Six

                << still uses a 3 wheeler... ;D

                Cool engine!

                1973 F-250 460/C6 -Camper Special 1983 Mustang GT 545/C6 - 10.46 @ 130 - Drag Week 2012 - Street Race BB N/A runner-up

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                • #9

                  Re: The Pontiac OHC Six

                  Re: The Pontiac OHC Six

                  I use the 3-wheeler for the V8, I was concerned about the length and height of the L6 on it.

                  The black tube is the oil filler neck (like an Olds on steroids :D). There was a 4bbl version, it had a high compression head too and some pretty cool cast iron dual exhaust headers. What did we determine Jim, the high output version of this engine made 215Hp and revved around 1000rpm more than the Chevy 250?
                  Escaped on a technicality.

                  Comment


                  • #10

                    Re: The Pontiac OHC Six

                    Re: The Pontiac OHC Six

                    had one in a 66 tempest..
                    ran ok.. the lifter like noise was unnerving
                    you just like engines with oil pumps on the outside..

                    Comment


                    • #11

                      Re: The Pontiac OHC Six

                      Re: The Pontiac OHC Six

                      I am a fan of distributors, oil filters and oil pumps in the front and easy to access ;D

                      The lifter rattle sound could be cause by a few things, I know the '66 & '67 didn't have a properly sized oil feed to the lash adjusters, in '68 they fixed it.
                      Escaped on a technicality.

                      Comment


                      • #12

                        Re: The Pontiac OHC Six

                        Re: The Pontiac OHC Six

                        note that these needed valve jobs every 50-60k

                        good luck.. if you m/s it.. are u ecu'n the spark.. if so. can u axe the dissy and still run the pump

                        Comment


                        • #13

                          Re: The Pontiac OHC Six

                          Re: The Pontiac OHC Six

                          The distributor still drives the oil pump per the conventional method. Basically the belt drives a shaft that has a cam lobe for the fuel pump and a gear like the distributor drive gear on a camshaft. Then the distributor runs off the gear and the oil pump off the distributor. Didn't re-invent the wheel there :P But short of finding another way to drive the oil pump, the distributor has to stay, even if only to simply distribute spark.
                          Escaped on a technicality.

                          Comment


                          • #14

                            Re: The Pontiac OHC Six

                            Re: The Pontiac OHC Six

                            The distributor still drives the oil pump per the conventional method. Basically the belt drives a shaft that has a cam lobe for the fuel pump and a gear like the distributor drive gear on a camshaft. Then the distributor runs off the gear and the oil pump off the distributor. Didn't re-invent the wheel there :P But short of finding another way to drive the oil pump, the distributor has to stay, even if only to simply distribute spark.
                            Cut the top off, turn it into a cam position sensor that drives the oil pump.

                            Although, you have wicked clean access to actually MOUNT a cam position sensor.


                            Distributors?? where Randal's going, they don't need distributors!! (cue Huey Lewis)
                            Proudly using www.DIYAutotune.com custom EFI components!

                            Comment


                            • #15

                              Re: The Pontiac OHC Six

                              Re: The Pontiac OHC Six

                              The distributor still drives the oil pump per the conventional method. Basically the belt drives a shaft that has a cam lobe for the fuel pump and a gear like the distributor drive gear on a camshaft. Then the distributor runs off the gear and the oil pump off the distributor. Didn't re-invent the wheel there :P But short of finding another way to drive the oil pump, the distributor has to stay, even if only to simply distribute spark.
                              Cut the top off, turn it into a cam position sensor that drives the oil pump.

                              Although, you have wicked clean access to actually MOUNT a cam position sensor.


                              Distributors?? where Randal's going, they don't need distributors!! (cue Huey Lewis)
                              Here ya go Scott! Found this a while back ;D http://www.groupwhere.net/megasquirt/








                              I believe the guy is using a wheel on the cam sprocket that was a 60-2 wheel, but ground two more teeth off to make it a 60-4 or rather a 30-2 wheel when split in half to make the Megasquirt think it's a crank trigger.
                              Escaped on a technicality.

                              Comment


                              • #16

                                Re: The Pontiac OHC Six

                                Re: The Pontiac OHC Six

                                dang - it's getting hard to be "unique" with Megasquirt anymore.


                                I remember back in the day - I did the first LS, the first Mod motor, the first DSM 4G63. Nowadays, you better be megasquirting the Space Shuttle if you expect to be the "first" at anything noteworthy. haha.
                                Proudly using www.DIYAutotune.com custom EFI components!

                                Comment


                                • #17

                                  Re: The Pontiac OHC Six

                                  Re: The Pontiac OHC Six

                                  No kidding :P That cam sensor was just there for testing, eventually he moved it to the backside of the cam sprocket so he could maintain the covers over the belt.
                                  Escaped on a technicality.

                                  Comment


                                  • #18

                                    Re: The Pontiac OHC Six

                                    Re: The Pontiac OHC Six

                                    So, Randal, what are the plans? It's great to see something different ;D Too bad Detroit didn't spend more attention on the inliners.
                                    Tom
                                    Overdrive is overrated


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                                    • #19

                                      Re: The Pontiac OHC Six

                                      Re: The Pontiac OHC Six

                                      I still remember seeing this engine for the first time.......it
                                      was the four barrel version and was pretty damn cool.

                                      They also had a unique sound when cruising.

                                      Good pick Randal
                                      Thom

                                      "The object is to keep your balls on the table and knock everybody else's off..."

                                      Comment


                                      • #20

                                        Re: The Pontiac OHC Six

                                        Re: The Pontiac OHC Six

                                        Cool thread, Randall. The interesting thing to me is how similar it is to my 250s. I could be wrong but I think my manifolds would fit.

                                        I'll be watching this!
                                        Dan

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