Stock Motor Cam Suggestions?

Discussion in 'High Performance Modifications' started by motor60, Jul 1, 2011.

  1. 80-z28

    80-z28 Veteran Member

    521
    0
    Apr 20, 2009
    New Orleans, La
    I did not realize that your compression was that high. In my opinion the xe268 or any cam from a reputable manufacturer with about the same specs will be a good choice.
     
  2. Rich Schmidt

    Rich Schmidt Veteran Member

    4,004
    1
    Mar 27, 2010
    Denville NJ
    Back in the day,I ran a flat piston 350 with 68cc stock heads,and a 278HMV Crane(now called the Powermax series) it had a slightly lope,but idled great at 700rpm out of gear(about 600 in gear),and seemed happy with a 2500 stall(cheapie $99 1000 over stock) convertor. If you dont want to change the convertor then go with the Powermax272,but expect a little less lope. With headers,almost any dual plane intake(I used an old port matched Wieand 8004 with a notch cut in the planum) and a 750 carb it will be a good upgrade over stock.

    BTW,I liked that HMV 278 so much that I bought another one over 20 years later and currently running it with 1.6 rockers in the 10.2:1 408 with the exact same heads from back in the day in Frankie. It idles stock in the 408,but runs 12's with just mildly ported camel hump heads.
     
  3. rustbucket79

    rustbucket79 Veteran Member

    I'm assuming by 1970 the heads are open chambers. It is entirely possible the engine has closed chamber heads, or anything else, since the engine is some 40 years old it may well be rebuilt with different than factory components. Best to do a compression test and find out the head casting numbers before chosing the final cam.
     
  4. Rich Schmidt

    Rich Schmidt Veteran Member

    4,004
    1
    Mar 27, 2010
    Denville NJ
    I thought he was talking about a small block here.
     
  5. rustbucket79

    rustbucket79 Veteran Member

    That's what I'm talking about, 350 small block. Other than the LT-1, I was assuming the other 350's would be running smog heads. He should confirm what heads he has.
     
  6. Air_Adam

    Air_Adam Veteran Member

    Stock '70 SS engine should have the same castings as the LT1 as I recall - minus the screw-in studs and 2.02/1.60 valves.
     
  7. Camarocore

    Camarocore Veteran Member Lifetime Gold Member

    595
    0
    Feb 18, 2006
    NY
    what about CS XE274H-10?
     
  8. 80-z28

    80-z28 Veteran Member

    521
    0
    Apr 20, 2009
    New Orleans, La
    With this cam he may have an issue with stock springs and converter.
     
  9. motor60

    motor60 Member

    85
    0
    Feb 27, 2011
    So. Cal
    So, sounds like the Crane 274 sounds like a good choice? and It comes with the lifters as a package? Does everyone agree? Dont wanna install the cam and LOSE my brakes.
     
  10. BigEd36

    BigEd36 Veteran Member

    141
    0
    Mar 14, 2010
    Auburn, IN
    An H-10 is a 4-7 swap cam.

    It's a good choice. But you can get the benefits of this grind without paying for the Crane name on the box.

    The Crane version is $209.95 for cam and lifters at SummitCRN-100172 for $209.95

    The Summit Racing branded version (made by Crane for Summit) is $133.95 for cam and lifters at Summit. Summit K00172 for $133.95

    The Elgin CL-1785-PK cam/lifter kit is $99.95 at Northern Auto Parts. CL-1785-PK Elgin cam/lifter kit for $99.95

    The Elgin version is $113.95 at Competition Products. Elgin E1785PM for $113.95 at Competition Products

    Not to further muddy the waters but I have another suggestion to consider. Since your engine has more compression than the '71 and newer smog engines you could handle a little more duration. I like single pattern cams in the older small blocks so I would suggest considering the Howards Cams #112431 cam. They give specs of .450 lift and 223* at .050, basically the same specs as the 327ci 350hp cam, and very close to the 350ci 350hp cam. But Howards grinds this cam with your choice of 106* (#112431-06), 108* (#112431-08), 110* (#112431-10), or 112* (#112431-12) lobe spacing angle, all tighter than the 114* that Chevrolet used so they could have a smooth idle and lots of vacuum for the masses. As mentioned earlier, about 224* @ .050 is the max you would want to run with a stock torque converter. 224* is also the intake duration on the XE 268 cam that has been suggested multiple times here. A 108* LSA would be a good compromise IMO. You would have a bit of rump rump, it would bring on great torque, but not be too radical. Even the 110* (same as the XE 268) should be a little stronger torque than the XE 268 due to being a single pattern cam (they usually have more torque than a split pattern cam). Here's a screen shot of the listing for the #112431-08 from www.howardscams.com

    [​IMG]
     
    Last edited: Jul 7, 2011

Share This Page