My 350 build getting closer need some advice

Discussion in 'Small Block Tech' started by Storm1, Oct 4, 2019.

  1. Storm1

    Storm1 Silver Level contributor

    That's what I told myself last winter, and now it's this winter!
    If all else fails, I'll take you up on that cam offer. Your spare has a bit more lift than the one I ordered.
  2. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    In the bold, that's a good thing. IIRC the cam you're waiting for could of used more lift to get your $$ worth out of the porting you paid for. I posted that a page or two back, not sure if you seen it or not?
  3. Storm1

    Storm1 Silver Level contributor

    Derek, I just went back and read your post. I must have missed it. I guess it's kinda late now because i already ordered and paid for the cam from TA.

    550 lift will be plenty streetable, easy on the valve train, no worries about running pump gas, and probably give me enough vacuum to run my brakes. Yeah there's some power left on the table, but I'm not building an all out racer mostly street. If I plan on doing more track time, I know I can always yank the cam and go bigger.
    Mart likes this.
  4. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    The beautiful thing about a roller cam is that you can have them ground with more lift and still keep the dur. @ .050" down in the streetable range. It will still have plenty of vacuum as the lower lift cam but will use more of the airflow the heads are capable of with the same dur. @ .050".

    A flat tappet cam needs to increase dur. @ .050" with more lift to help keep the ramp from getting to aggressive that it wipes itself out where a roller cam to a point, not so much.

    I can't recall your flow numbers but the biggest roller cam lobe unless they changed them is .365" so you can get to a .602" with TA's 1.65:1 roller rockers and still keep the duration @ .050" streetable.

    If the cam isn't ground yet, you may be able to change it before it is?
  5. Storm1

    Storm1 Silver Level contributor

    It shipped. I should have it this coming Monday.
  6. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    Cool project!
  7. Storm1

    Storm1 Silver Level contributor

    Thanks Sean :)

    So I got my cam this morning. The cam card that shipped with the cam is different than what I was told I would be getting.

    This is the cam card I was told I would be getting:

    This is the actual cam I received:

    Lift is .001 under
    Duration (advertised) is 8 higher
    Duration (actual) is 1 under
    Overlap is 1.5 less
    Exhaust/Intake Open/Close are between .5° and 1° different

    I assume there are acceptable tolerances +/- when grinding cams. Would these differences fall within tolerance?
  8. UNDERDOG350

    UNDERDOG350 350 Buick purestock racer

    Looks like you need to call them. You might have the wrong com. And dang whats with the spring pressure recommended??? Is that right for a roller cam?
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    My Hydraulic Roller Cam uses 370/145 springs.
  10. UNDERDOG350

    UNDERDOG350 350 Buick purestock racer

    Is that due to the excessive lifter weight?
  11. telriv

    telriv Well-Known Member

    Yes, has something to do with it.
  12. Storm1

    Storm1 Silver Level contributor

    Looks like the dual springs i bought with my valves will have to go back. They are rated 100 lbs / 250 lbs

    Didn't have a chance to call TA yesterday, I'll call when they open today.

    I'm just wondering if the cam they sent is better or worse for my build? :confused:
  13. Storm1

    Storm1 Silver Level contributor

    Ok I talked to Tim @ TA. He told me that the cam is (basically) within spec. TA has cam cards they recommend which when all is said and done, cannot be exactly duplicated.

    Intake/Exhaust - Open/Close (+/- a degree @ .050)
    Duration (+/- a degree @ .050)
    Overlap (actual) was lower than estimated, meaning more low end torque with both valve open less at the same time.

    The springs I ordered are wrong. Crower recommends 290/120 for this grind. TA has (through testing) proved that those recommended numbers way low. They up the pressure to real world experience with roller cams. The cam card I got says 350/150 springs. He said I can use the 1130 springs @ 325/125 no problem.
    Last edited: Dec 10, 2019
  14. Storm1

    Storm1 Silver Level contributor

    Lets talk ignition box, distributor, coil

    I was running a Malory Unilite distributor. Does anyone make a low profile HEI that will fit under the snorkel?

    I want a rev limiter. Looks like a lot of people run the MSD6AL ignition box for that and additional spark.

    I currently have a Mallory coil @ 40,000V. Is that enough?

  15. alec296

    alec296 i need another buick

    Get a stock distributer converted to electronic by everyday performance, thats all you need is a trigger for a 6al box. Coil will work .
    techg8 likes this.
  16. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    You can also trigger a box with points. The good thing about that is the points carry very little current in that configuration, so there is no wear.
    alec296 likes this.
  17. Jim Weise

    Jim Weise 1000+HP

    Roller cam spring pressure is higher due to the requirement to ALWAYS keep the roller in contact with the lobe.

    But even with the higher spring pressure, I have observed that roller cam motors are noticeable easier to turn over by hand, with the plugs out.. due to the massive reduction in friction on cam I am sure.

    just reviewing this thread to build Kevin a converter, and I thought I would mention that..

    Storm1, MrSony and Mart like this.
  18. Storm1

    Storm1 Silver Level contributor

    Thanks Jim

    The carb is shipping out this morning for rebuild.
  19. Storm1

    Storm1 Silver Level contributor


    Getting closer. Jim should have my carb back from dyno soon. Motor is coming along nicely. I should be ready for install within a month or so!

    Dano and Mart like this.
  20. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    Pics of the intake ports? Looks like some good flowing exhaust ports.

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