1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

Need A New Camshaft...

Discussion in 'Early CJ5 and CJ6 Tech' started by Bearskin10, Sep 27, 2022.

  1. Sep 27, 2022
    Bearskin10

    Bearskin10 New Member 2023 Sponsor 2022 Sponsor

    Lakewood,CA
    Joined:
    Mar 6, 2019
    Messages:
    48
    Like the title says I am in need of a new camshaft and from what I have read Comp Cams 252H is a good choice to add a little RPM so looks like they are out of stock everywhere for the time so looking to pre order just want to make sure this is the correct one? https://smile.amazon.com/dp/B001R9B...colid=1EUTEDEAA6023&ref_=lv_ov_lig_dp_it&th=1 Engine is a 69 225 odd-fire, in the description it says for 62-67 odd-fire.... Thanks in advance
     
  2. Sep 27, 2022
    Jeepenstein

    Jeepenstein Me like Jeep..

    North Central FL
    Joined:
    Jun 15, 2003
    Messages:
    2,132
    There used to be a Cam comparison chart floating around on there somewhere that I put together years ago.. It had the stock specs Vs. several non OEM cams.. I suck with searching but it may still be hiding on here somewhere.. Maybe one of the smart people can find it?
     
  3. Sep 27, 2022
    dnb71R2

    dnb71R2 SuperDave 2023 Sponsor

    Grand Mesa, CO
    Joined:
    Aug 13, 2006
    Messages:
    1,320
    For what it's worth, since you haven't offered any other details of your engine build, have you improved or upgraded exhaust AND carburation?
    I considered a cam when I bought my remanufactured 225 a few years ago. Since I was NOT upgrading exhaust (still using manifolds), nor carb (still using the Rochester 2GC), it wasn't worth the small performance gain that a cam might offer.
    The V6 Performance book, by Pat Ganahl, illustrates this pretty clearly. There certainly is plenty of extra power to be had, but you have to invest in all components at the same time.
    And just my 2 cents...a fresh stock 225 is a perfect match for the early CJ5. Get it geared right and have LOTS of fun.
     
    melvinm likes this.
  4. Sep 27, 2022
    Bearskin10

    Bearskin10 New Member 2023 Sponsor 2022 Sponsor

    Lakewood,CA
    Joined:
    Mar 6, 2019
    Messages:
    48
    I do have headers and I also still have the stock Rochester 2G, although I do have a dual port offy sitting in my garage wanting to be installed just waiting to pick up a 4 barrel carb. Just figured since I need the Camshaft I might as well upgrade it while its out?
     
    dnb71R2 likes this.
  5. Sep 28, 2022
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sedalia MO.
    Joined:
    Apr 8, 2008
    Messages:
    4,716
    There should be some fruit to gain with a mild cam even on a stock motor. You would need to be really choked up somewhere for it to make things worse. My 4.3 has some of the worst heads chevy made with stock 4 barrel intake choked down to a 2 hole Tbi and log exhaust manifolds from a 3.3 but it is running an rv/ towing cam.
     
  6. Sep 28, 2022
    maurywhurt

    maurywhurt Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Western North...
    Joined:
    Dec 12, 2009
    Messages:
    873
    When the original 225 in my '67 was rebuilt in 2015, I had the engine builder keep it externally stock, using the original 2G carburetor and exhaust manifolds. However, many internal improvements were made, including a new camshaft.

    During the rebuild, the engine was line bored and balanced (both rotating assembly and weight-matched). The block and manifolds were ported. Cylinders were bored to accommodate 231 pistons, block was decked, and heads were shaved, yielding a compression ratio of 9.18:1. A custom Comp cam (based on modified 260H design specs - see cam card below) was installed, along with new oversized valves, springs, seats, guides, pushrods, hydraulic lifters, and new bearings throughout. TA Performance adjustable oil pump and Cloyes double roller timing chain & gears were also installed during the rebuild. The original distributor was rebuilt and recurved by Advanced Distributors in Shakopee, MN, and a Pertronix unit and high-voltage coil (Brillman SuperStinger) were installed. The original Rochester 2G carburetor was rebuilt and restored, incorporating multiple modifications / improvements, by The Old Carb Doctor (Jeff Dreibus), Nebo, NC.


    [​IMG]

    The new cam has a good deal of duration and lift, but with the 112 degree lobe separation, the engine idles very smoothly and doesn't "lope". There was no noticeable change in low end torque following the rebuild, but mid and upper RPM ranges now have significantly increased power. Incidentally, the cam was nitrided (by Comp) to increase its durability.

    My engine builder had previously built a number of 231's before rebuilding my engine, and knew what he was doing when he spec'ed this cam, as it runs extremely well.
     
    Last edited: Sep 28, 2022
    Tom_Hartz, Fireball, dnb71R2 and 2 others like this.
  7. Sep 28, 2022
    dnb71R2

    dnb71R2 SuperDave 2023 Sponsor

    Grand Mesa, CO
    Joined:
    Aug 13, 2006
    Messages:
    1,320
    I knew opinions and info would fly with my comment...good to see others have success with just a cam upgrade.
    My original 225 was so weak that I was just pleased to have a fresh engine doing its thing...with HEI!
     
  8. Sep 28, 2022
    Jw60

    Jw60 Sitting up n buckled down. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Sedalia MO.
    Joined:
    Apr 8, 2008
    Messages:
    4,716
    Another note is that engine theory has come a long way and our motors are in the late morning of engine development (or dawn for the 134) the cam grinds have become more effective and even grinds of the same duration can be very different from one manufacturer to another.
    My 4.3 is one of the few flat tappet 4.3s made in less than a two year window. I was very limited in "off the shelf" units but a good grind can be had if you think of it as a 3/4 v8.
     
  9. Sep 29, 2022
    Bearskin10

    Bearskin10 New Member 2023 Sponsor 2022 Sponsor

    Lakewood,CA
    Joined:
    Mar 6, 2019
    Messages:
    48
    So just picked up a 4 barrel carb, wasn't what I wanted but the deal was to good to pass on $150 for a basically new Edelbrock 1403 yeah I know 500 is a lot of CMF for the 225, I wanted the Holley 8007 but at $700 wasn't in the budget at the moment and I have heard of a few people running the 1403 with success but guess I'll find out? If it doesn't work I don't think I will have any issue getting the $ 150 I paid for it back....
     
  10. Sep 30, 2022
    Tom_Hartz

    Tom_Hartz Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    North Carolina
    Joined:
    Apr 9, 2014
    Messages:
    478
    I have a CJ with a 225 that runs fantastic. The previous owner had the engine built. Compression is between 200 and 215 psi, aftermarket cam but unfortunately I don't have the specs. It seems to have a good amount of overlap due to the idle. I'm running a Offenhouser duel plane manifold with a 390 Holley and headers. You can get allot more out of a more modern engine but it is s fun to drive. I also have a Jeepster with a stock 225 that I hope to wake it up too. Keep us posted on how your project works out.
     
  11. Sep 30, 2022
    Jeepsterjim

    Jeepsterjim Member

    Lincoln, CA
    Joined:
    Apr 25, 2019
    Messages:
    401
    It's fun reading the different configurations we come up with when customizing motors or anything for that matter. I am in the process of building a '76 231 OD and plan on using a 252H/260H cam or its equivalent. TA Performance has a good selection of cams though a little pricey. The simple plan of boring 20 over, deck and shave the heads and block to bring the compression back up to 9.5 to 1, Port the intake and exhaust to match the gaskets, Offy Dual port intake, Edelbrock 600 CFM Quadra jet Carburetor, upgrade the timing cover and oil pump, Cloyes cam gears and chain, FlowKooler water pump and thermostat, and a after market HEI that will be dyno'd to the motor. Motor will be balanced as well. Should be a very nice torque motor.
     
    Fireball and Tom_Hartz like this.
New Posts