Replacement Cam Advise, Stock 430

Discussion in 'Street/strip 400/430/455' started by Electra man, Feb 11, 2019.

  1. Electra man

    Electra man Older and Slower

    I'm looking to replace the cam on my stock 67 430 for mild wear. All my lifter bottoms are mushroomed and there is slight measurable wear on the cam lobes. This car is a cruiser and won't see any track time. I'm looking to do better than stock for more torque than hp and revs. Completely stock drivetrain with open rear. The engine only has 61k on it but was sludgy inside which is why I pulled the intake. I'll be working with the stock 1.6 rockers and don't have plans to pull the heads at this point.
    I've looked at the TA selection and am drawn to the 284-88H but I don't want to over cam the engine.
    I've also looked at the Comp Cams 96 203-4 and the 96 202-4 as possibilities.
    Am I off base with any of these cams or should I be thinking something closer to stock like the TA 112-455?
    Also when looking at the lift specs on some of these should I be adding lift for the 1.6 rockers as they seem to be spec'd for the 1.5 rockers on a 455. Most of these cams also specify 8.1-9.1 compression and the 430 is probably more like 9.8.1-10.1.
    Thanks in advance.
     
    Nailhead Ronnie likes this.
  2. Stevem

    Stevem Well-Known Member

    Expecting better rev's out of valve springs with 61K on them and now being kicked around with a new higher rate Cam is not going to pan out of you!
     
  3. Electra man

    Electra man Older and Slower

    I'm not really looking for revs mostly bottom end. I can easily change out the valve springs with the heads on I have the tools to do it but never did it on a Buick. Have done a bunch of Chevys and Pontiacs and one olds before.
     
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    TA 112 or the Stage 1 cam hands down. Your static compression is more like 9.4:1.

    CompressionCalculations.jpg

    Either of those cams will give you about 7.90:1 Dynamic Compression which is right where you want to be. Those cams will have more low end torque. The TA 284-88H lowers the DCR to 7.33:1 and will give up a little low end for gains past 5000 RPM.
     
    Houmark likes this.
  5. Electra man

    Electra man Older and Slower

    Thanks Larry. What grabbed me about the 284-88H was they claim a little more low end than the 112 but this engine will probably never see 5k until after its rebuilt but that's years from now.
    I'm assuming those specs apply to a 67 430 as well because they didn't change much in the 430's run.
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    I would expect that the 430 pretty much stayed the same from 67-69. Look at the power range for those cams, TA112, Stage1, 1500-4500, the TA284-88H, 2000-5000. You lose a bit at the bottom to get more HP at the top. For your application, stay small. JMO.
     
    Houmark likes this.
  7. FJM568

    FJM568 Well-Known Member

    I would break-in the new cam using your original weak springs. Do the initial cam break-in, do an oil/filter change, and then put some real easy, not higher than about 3500 rpm miles(maybe no more than 200 miles) on the motor, then swap the new valve springs on with another oil/filter change and you should be good to go.

    At least that's what I would do.
     
    65Larkin likes this.
  8. Electra man

    Electra man Older and Slower

    That's a great idea and I've done it before but the reason I opened this engine was for sludge buildup. I have to pull the springs to clean the stems of crud before I start it. I don't want shave the stems clean with the guides becuse of the bigger cam and I'm not putting the old springs back when I'm done.
     
  9. rmstg2

    rmstg2 Gold Level Contributor

    The 284-88H works well in my 455 lots of power and decent fuel mileage, as high as 16.8 at 65 and 70 MPH. Works well with power brakes also and has a nice sound!

    Bob H,
     

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