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- Carter Dual 4-Barrel Carburetor Adjustment
- Carter Dual 4-barrel Carburetors, Linkage Sticking
- Buick Cam Specifications for 401 and 425 nailheads
- Buick Cams from Kenne Bell, 401, 425
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Thread: 401/425 specs

  1. #1

    401/425 specs

    Guys:

    I'm new to the forum and have done several searches to augment the 401/425 engine specs I already have from other sources. I'm trying to find the following dimensions and any help would sure be appreciated:

    1. Block height (CL of crank to head mating surface)
    2. Connecting rod big end width
    3. Compression (pin) height[s]
    4. Piston dome cc where applicable

    Russ

  2. #2
    Wow! No takers? I didn't realize this nailhead information was "classified". Hmmm. Maybe I should check Wikileaks ... Seriously, any help would be greatly appreciated and in the meantime, I'll continue searching the web.

  3. #3
    Join Date
    Nov 2008
    Location
    Sisters OR
    Posts
    454
    Rep Power
    0

    401/425 specs

    If your coming up to Sisters some time, you can measure my 425 block. It is disassembled and all the parts are clean.

  4. #4

  5. #5
    There is also this in the reference section:

    http://www.teambuick.com/reference/n...gine_specs.php

    Along with a '66 Chassis Manual, but no deck hieghts there.
    Last edited by Bob; 12-11-2010 at 08:21 AM.


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  6. #6
    Suntreemcanic: Thanks for the offer! Unfortunately, I don't have the tool to accurately measure the block height.

    Kitabel: Great web site! I bookmarked it for future reference. Got two of my missing specs (block height a 10.000" and rod big end width at .967") plus a bonus spec of the bore spacing at 4.750".

    Bob: I had found TeamBuick and you're right that they have very extensive and detailed engine specs on just about everything you can think of ... other than the few I was asking about.

    Anyway, thanks to all. Russ

  7. #7
    Most 401/425 block deck heights are between 10.012"-10.020" & usually don't vary by more than .002" per side. Same with block squaring from the factory are usually within .001"-.003" per side. Rod big end widths are between .964"-.968". Compression height for 401/425 pistons are usually between 1.924"-1.926"
    Tom Telesco
    Classic and Muscle Automotive
    12 Cook St.
    Norwalk, CT 06853-1601
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads
    Custom forged pistons
    Front & rear neoprene seals
    Many other "Nail" parts
    "If I can't get it, you don't need it!"

  8. #8
    Tom:

    Thanks for the more accurate values for the block height and rod width, and for the compression (pin) height. I guess when there's a range and the web site's presentation allows for only a single value, the author picks something in the middle. I, of course, prefer the factory range you provided so I sure appreciate your input.

    Russ

  9. #9
    Join Date
    Jul 2008
    Posts
    122
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    Piston Domes, measured:

    Stock '64 401:
    4 pistons measured:
    46.1 cc
    45.4 cc
    45.5 cc
    45.9 cc

    Zollner 401 replacements:
    46.5 cc avg

    Ross 425 Forgings:
    44.4 cc

    TRW 401 Forged NOS:
    45.3 cc

    Now would you tell us what you're up to???
    Walt
    65-66 GS's

  10. #10
    wkillgs:

    Thanks for the piston dome CCs. I knew from photos that they were substantial (and necessary) to result in the 10:1+ compression ratios, given the size of the Nailhead combustion chamber.

    And, as usual, I'm up to no good ... Seriously, I'm setting up my "baseline" engine analysis spreadsheet. From there, I can make various changes and see how that affects various ratios (bore:stroke, rod:stroke, static compression, etc.) and such. Some of these detail specs also allow one to look at possible replacement components from other sources and platforms.

    continued ...
    Last edited by RussKing; 12-13-2010 at 04:13 PM.

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