Installing points conversion, and HEI System function, tests, and modification.

Discussion in 'Buick FAQ' started by LARRY70GS, May 13, 2012.

  1. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Yes, you have it right. It can be difficult to line the oil pump up at times, just turn it as you need to. Just make sure to fully seat the distributor and tighten the hold down sufficiently so the distributor does not pop up when you start the engine.

    As far as finding TDC compression, make sure you bump the starter over a little at a time instead of cranking it, you can run past the mark like that. When you feel compression the mark should be coming around. Turn it the rest of the way with a socket and breaker bar if you can. It’s OK to line the balancer mark up with the tab for the initial timing you plan to run. Good luck.
     
  2. drspencer

    drspencer Well-Known Member

    Will a Buick,or aftermarket, HEI fit under the stock Ram Air cleaner?
    Thanks
     
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Frequently, no.
     
  4. 71 GS

    71 GS Well-Known Member

    Thanks again Larry , once I set the timing & re-fitted the distributor she fired up and ran beautifully ! a few things to tidy up and the job is done . Thanks again regards Darryn
     
  5. 71 GS

    71 GS Well-Known Member

    Hi Larry , took the GS for a road test last night and feels smooth but I think it could be better, might put my timing light back on it , what's the recommend degrees for the 350 4bbl auto transmission, I think its 4-6 BTC or would it run better at a different mark now that I've installed the HEI.
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    This is EXACTLY why I wrote this thread,

    http://www.v8buick.com/index.php?threads/power-timing-your-buick-v8.63475/

    Initial timing means next to nothing. Distributors have different amounts of mechanical advance. Depending on what you have (did you buy the TA big cap HEI?), initial timing requirements will vary. It is the total timing at WOT and cruise that matters for best power and gas mileage. You need to set the total timing using your timing light. Read the 1st post in the linked thread and download the attached word document.
     
  7. 71 GS

    71 GS Well-Known Member

    Thanks Larry, Really happy with my turn out followed instructions made the mark around the harmonic balancer & got the revs right so the mark wouldn't climb up and lock it in ! Man what a difference I've never had performance like that on this car, the only trouble I had was the HEI
    hitting the manifold so had to move no1
    around the cap about 3 time till I got right & the vacuum hose is facing the fan with about an inch clearance not ideal but didn't want to file anything . Cheers Darryn
     
  8. 71 GS

    71 GS Well-Known Member

    Hi Larry,
    I've been reading some threads on V8buick regarding improving the street performance of my 1971 GS 350 4bbl
    looking at stages bit by bit & I think I might start with rear differential & up grading to a possi drive , not sure what I have but it's not a possi drive ! know idea where to find one ? can I just replace the diff head to get the gearing I need , or what's the best way to go about it , or would you have a completely different idea regarding performance etc .
    Appreciate your time, thanks regards Darryn
     
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    You need to buy a Posi Carrier. If the rear in your car is original, it is the 8.5 10 bolt. It's an excellent rear with lots of aftermarket support. You can order everything you need right out of the Jegs or Sumitt catalog. I would contact V8 member Monzaz. He might be able to get you better prices as he builds these rears for a living. I went with the Eaton Posi carrier. This is the one you need if you still have the 8.5

    https://www.summitracing.com/parts/etn-19557-010/overview/

    Take a picture of the rear cover and rear U-joint retention to confirm you still have the 8.5.
     
  10. 71 GS

    71 GS Well-Known Member

    Thanks for that I really appreciate your help , Would you advise me to change my gear ratio as well ? as I'm trying to achieve a faster take off speed or just stick to the possi carry to gain traction control with my factory gearing.
    Once I send some images to you I'm guessing you would know exactly what my gear ratio is. Thanks
     
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Not sure of the gearing, there are letter codes on the axle tube.
     

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