What is wrong with the S divider?

Discussion in 'Small Block Tech' started by MrSony, Sep 7, 2018.

  1. Jim Blackwood

    Jim Blackwood Well-Known Member

    I can't make any comment on strip performance but we used the Posten on the 455 in the MG-Roadmaster build because it was given to us and we were weight conscious. Overall that has worked out well. The intake as received had some of the divider cut out and we did not use a spacer for height reasons. Q-jet carb, Star Wars air cleaner with K&N filter and big holes cut in the bottom for restriction relief. My impression is that it is not limiting the engine and has caused no driveability issues whatsoever. We are running the TA Stage 2 SE heads on that motor with a relatively mild cam. So until and unless we ever put higher compression pistons in the engine I see no reason whatsoever to make a change. We got what we were looking for.

    Jim
     
  2. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Have you ever seen a sbb 350 dyno test with the SP3 with a solid roller or even a solid flat tappet cam that is suppose to make power in the higher RPM range using ported heads?

    Or was all the pulls you seen using hyd. TA 212 hyd. flat tappet or the hyd. roller version of the TA 212 cam been with the Stage 1 low rise dual plane intake?

    To make power in the higher RPM range the cam and the intake need to be matched to do that, not just one or the other. That's why different cams and intakes are made.
     
  3. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    That is a relatively small cam that a high rise dual plane intake would work great with! To big for the low rise Stage 1 intake and not quite big enough to utilize the SP3 single plane's full potential.
     
    Swagon likes this.
  4. Swagon

    Swagon Well-Known Member

    That's what I was thinking, if there was intake somehwere in the middle of the two it would work so much better. But also a bigger solid roller sounds more fun lol.
     
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  5. wunquik86'

    wunquik86' Well-Known Member

    Depressing to say the least. Was reading on here last nite about the upcoming Ta SP1 intake and Aluminum heads for the 350 and got all excited. Had not looked at my engine since removing it from the car to replace it with a 455 and filling it with diesel and transmission fluid. I thought I remembered it as having an Edlebrock Performer on it, (don't know they even make an aluminum intake for 350 buick) so I went out to the garage this morning to see how many parts might be missing from the engine and CRAP, it's a Poston, S-Divider/ B-350. I know where the Edlebrock intake is. I have a 1970 BBB in an 86' Olds Cutlass there it is. Sure glad I'm a member of V8 Buick, I for sure would have thought I had something in that Poston intake. What about the Poston roller rockers? I bought a set for 625$ at the Buick Nationals about 10 yrs ago I'm pretty sure.
     
  6. MrSony

    MrSony Well-Known Member

    Rockers should be fine. BBB and SBB rockers are different. As said earlier, the Poston intake isn't a bad intake, it's just not very much of an improvement over stock, save for the weight. Unless someone were to dyno a stock, Ta, and Poston intake all on the same engine on the same day, no one would really know the power gains, but 50lbs of weight shed is 50lbs.
     
  7. Fox's Den

    Fox's Den 355Xrs

    The front end comes up faster, better weight transfer and you get a better 60 ft time lol

    Plus easier on the back when you R/R
     
  8. buickbill

    buickbill Well-Known Member

    I just got a 71 lark custom with a poston intake .from what ive read ,not sure what to think .40 pounds less wt. aint bad for sure car has a comp cam 268h . has 3.73 gears and 200 trans.. mtr runs decent ,but dosnt seem as fast as I would have thought it would be .has edlbrk avs 650 .seems very weak of the line .is that from the cam,intake, carb or all just not working together
     
  9. alec296

    alec296 i need another buick

    Loose the Edelbrock carb , although it would be holding you back more on upper rpm, get a tricked Quadrajet from Quadrajet Power, recurve timing on distributer to come in sooner, initial timing atleast 12 advanced. Get a 2500 small block rated torque converter, that cam prefers headers, maybe advancing cam 4 degrees may help it also. But I believe some of it is the lower 8.2 compression, although others have used cam with good luck.
    My personal choice would not have been the comps cam.
    Some porting with heads milled .060-.070. Would help some.
     
  10. buickbill

    buickbill Well-Known Member

    its got headers now . has a plastic ,or whatever they are made of spacer as well. was told its 9.1 compression pistons . cant find any info on the cam . dosnt seem to have any low end. anyway ,the manifold s aren't nothing grt? ive got t/a a stage 1 .would it be worth the trouble to swap them??
     
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  12. buickbill

    buickbill Well-Known Member

    thnx for the link larry . dosnt seem like its to big .didn't think it was . not much lope .po said it didn't have enough vac. for the brakes ,so he installed hydrovac . seems like it should have had plenty if it was installed correct?
     
  13. alec296

    alec296 i need another buick

    Yes, it should have decent vacuum, you have other problems if vacuum is low. Weak springs, poor valve seal, cam timing off, vacuum leak. Plenty of things that could be, and will increase your low end if problem is corrected
     
  14. buickbill

    buickbill Well-Known Member

    I bet the cam wasn't degreed. ive never did it , myself . and I guess it should always be done. any easy way to tell if its right ?
     
  15. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    That's a small cam. If you have low vacuum, you have other problems as mentioned. Buick engines do much better with split pattern cams, more exhaust duration than intake.
     
    alec296 likes this.
  16. Mart

    Mart Gold level member

    Tip of the day, compliments from gsjohnny.
    When ever degreeing a cam in and you're second guessing yourself. The best way to double check is to put # 1 piston at TDC in over lap and put both lifters in for #1 cylinder, If the cam has 4 degrees advance built into it and you put a straight edge across the 2 lifters and the intake lifter is .020 to .035 higher then the exhaust lifter your fine. If the cam has no advance ground in both lifter should be appox. the same height. If the cam is retarded the exhaust lifter will be higher then the intake lifter. Before degree wheels and indicators were around this use to be the old fashion way of checking to see where the cam was installed. Learned this many years ago from an old timer. This does apply to BB's its a little more complex as the lifter do not run inline with each other. You have to use 2 indicators or record the two heights in over lap and compare.

    I imagine you could do this method using the rockers as a gauge point instead of the lifters, that way you won't have to remove the intake!
    This dbl check works. I've checked it while my engine is opened up, degreed, and it is spot on.....
     
    Last edited: Dec 5, 2018
    300sbb_overkill and alec296 like this.
  17. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Just the BBC's lifters aren't inline, and I believe that all or most the other makes of big blocks are inline?
     
  18. Mart

    Mart Gold level member

    Ok, So lets get picky. Most know if the lifters are staggered...you will need to change the parameters to work...
    Besides, this IS A BUICK site.
     
  19. Mart

    Mart Gold level member

  20. Fox's Den

    Fox's Den 355Xrs

    Interesting info there. I was told a long time ago to use the Dextron with Mercon. At one time I used the Ford fluid in the 350 trans.
     

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