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  1. #1
    Join Date
    Oct 2005

    Default pilot bushing options for 75 455

    trying to put a 4 speed behind a 75 455. i know there's a problem when it comes to getting a pilot bushing in there. i read a post on here about dick miller racing and him having one that works. i looked on his site and didn't find anything. anyone have one, and having good luck with it? can i just get a bushing machined to specs? looking for some options here..motor is assembled so i dont think taking it apart to get crank machined is what i want to do..thx

  2. #2
    Join Date
    Mar 2002
    Sunny Seminole FL

    Default Re: pilot bushing options for 75 455

    Check your block for the stud boss hole on the driver's side. I don't think the 75-6 block have this hole since no 4 speeds were offered in those years.
    I don't think you can machine the crank w/o removal since you need to have snap ring groove installed to retain the pilot bushing unless someone has one that is a press-fit.
    George Nenadovich
    Buick Performance Club Founder

  3. #3
    Join Date
    Aug 2004

    Exclamation Re: pilot bushing options for 75 455

    I went thru this on an Olds.

    The adapter bearing is used on cranks that do not have the correct hole machined. It is a press fit into the converter snout hole.

    Well, the one I used failed - it spun in the O.D., and it was a tight press fit.

    Drilling the crank in the car is harder than Chinese arithmetic.....

    My advice is to have the crak machined correctly.

    The Olds press fit bearing is BCA 7109

  4. #4
    Join Date
    May 2002
    Central Indiana

    Default Re: pilot bushing options for 75 455

    In this case have the pilot bearing O.D. turned down to match your crank. It has recently came to light the after market BBC bearing may be just a touch to large of an outside O.D. The difference is not much, I believe the dimension is in the U-Shift-Em section. Use a Brass type bearing and not the roller type.

    I am not shure if the cranks intended for 4 speed applications were cleaned up just a touch (as all of the ones I have seen were drilled) or a Buick pilot bushing was a different size (smaller O.D.) than a Chevy and the aftermarkets close enough theroy is causing problems. Not everyone has had the problem, but a enough people have to see this as a potential concern.

    I still find it hard to believe that when the engine was being assembled they knew which trans it was to be matched to though.

    It seems the larger O.D. being pressed in the smaller opening distorts the I.D. of the bearing and not allowing the trans input shaft to slide thru.

    1965 Riviera Gran Sport Super Wildcat
    1968 GS350 with 462, AL Stg 1SE, M20-- 12.23@114.5
    1987 Regal Turbo T LC2 Y56 W02

    BPG #1128, GSCA #2316,

    "I'm out of the Midwest. It was a good place to come from. It give you a sense of right or wrong and fairness, which I think is lacking in our society." ---Steve McQueen

  5. #5
    Join Date
    Jun 2003
    Joliet, IL

    Default Re: pilot bushing options for 75 455

    Quote Originally Posted by GStage1 View Post
    Check your block for the stud boss hole on the driver's side. I don't think the 75-6 block have this hole since no 4 speeds were offered in those years.
    I'd check the block regardless. My block is a 73-74 and it had no provisions for the block stud. Drilling and tapping the hole with engine in car was quite interesting.
    Mike Prybell
    72 GS Clone
    455 Stage 1
    4 Speed
    08 Tundra CM 5.7 4x4
    Fat Bob 3/1 level kit
    Airaid CAI
    CCGSCA # 118

  6. #6
    Join Date
    Feb 2003
    Steeler country

    Default Re: pilot bushing options for 75 455

    Dunno if this helps. But I just swapped the clutch on the BBB Chevy 4X4. While I was in there, I pounded in a new GM roller pilot bearing. Fit great. Crank is 69 430.

    1969 Wildcat Convertible (14.92 @ 91.54)

  7. #7
    Join Date
    Apr 2002

    Default Re: pilot bushing options for 75 455

    I too have a fully built 75 455 that I want to put into my 70 GS 455 4 speed car for a while.
    Keep me posted on what you conclude to make this year motor work under 4 speed application
    Richard Johns

    Owner/Operator Pure Stock Auto Restorations Inc

    70 GS Stage 1 Convertible Auto 3:64 12.71@109.15 1.92 60 ft PSMCDR 2009
    70 GSX Stage 1 M21 4 speed 3.64 Original Paint # 67 of 678
    70 GSX Stage 1 Auto 3:64 # 603 of 678 12.44@109.73 GS Nats 2012, 12.71@110.64 PSMCDR 2011
    70 GS 455 M21 4 speed 3:42 Bench Seat
    87 GN Astroroof
    70 GTO Judge Ram Air III M21 4 speed 3.90
    69 GTO Judge Ram Air IV M21 4 speed 3.90

  8. #8
    Join Date
    Mar 2005
    Barrie,Ontario, Canada

    Default Re: pilot bushing options for 75 455

    I used a roller bearing from a sbc or bbc I believe they are all the same size. I then made my own hyd cluch set up so I didn't need to worry about the stud boss hole stuff. Hope that helps!
    Brad Richmond
    1955 belair project
    1986 455 regal w/ t-10 and 9" disc brake rear 12" front brakes
    1970 Dodge Challenger

  9. #9
    Join Date
    Aug 2002

    Default Re: pilot bushing options for 75 455

    Both my '70 and '73 blocks were drilled and tapped for the stud. They were both engines out of big cars. My '76 blue block was also out of a big car and it is drilled only, not tapped. ?!?!



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