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Thread: SBC 400 block build date

  1. #1
    Junior Member SHOW GUEST
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    SBC 400 block build date

    Got a SBC 400 "509" and been trying to ID it. As far as I can tell its possibly made in Saginaw due to a casting clock on it. My friend said its an early 70's cheater block probably from a truck, and probably high nickel content. I found the following mark "H/17" which I think is the manufacture date. If it is, then the block would be from 1 Aug 1977. 2 bolt.
    Two questions: how does one figure out if it is a high nickel content block and can anyone verify or ID the "H/17" mark?

    tks in advance

  2. #2
    Senior Member RACING JUNKIE
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    if i recall right.......the truck block(high nickle block) had a raised half moon shaped stamp right on the back of the block on the opposite side from the block number is located :wink:
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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  3. #3
    Senior Member RACING JUNKIE
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    i got one in the back off my garage ... and the block is still stock and unmolested... i was gonna use it for a street build
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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  4. #4
    Senior Member RACING JUNKIE
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    I don't know that there was ever a high nickel 400 block ever made and i've ran several of them, including the one in my car and one on the engine stand in my shop. 350's yes, 400's i doubt.

    JMO

    Zip.

  5. #5
    Senior Member RACING JUNKIE
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    Quote Originally Posted by zipper06
    I don't know that there was ever a high nickel 400 block ever made and i've ran several of them, including the one in my car and one on the engine stand in my shop. 350's yes, 400's i doubt.

    JMO

    Zip.
    the 509 was not the nickle block it was the 817 block from the same year... but like all 400's gotta be careful cause of core shift and make sure you got steam holes in the heads and gaskets

    3951509
    3030817++
    1974 - 1976 400ci 2 Bolt Mains
    ++High Nickel Block
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  6. #6
    Senior Member RACING JUNKIE
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    Thanks fast75vega, for passing along those #'s. A person never gets too old too learn something new and i just did ops:

    Zip.

  7. #7
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    I found another source identifying alloy % content mark: "010 and 020." The first being tin and the second nickel. I got the 010 mark but not the 020 so that follows with what you found - oh well. I'm about to take it in and get it magged and all that...will help me decide how to build on it. First engine build, going to be either 406 or 427.

    tks for info guys!
    James
    Royal Rangers
    "Mentoring Future Men"
    1 Cor 9:24

  8. #8
    Senior Member EXPERT BUILDER
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    Quote Originally Posted by RROP89
    I found another source identifying alloy % content mark: "010 and 020." The first being tin and the second nickel. I got the 010 mark but not the 020 so that follows with what you found - oh well. I'm about to take it in and get it magged and all that...will help me decide how to build on it. First engine build, going to be either 406 or 427.

    tks for info guys!
    James
    Sonic test it before you do anything!!!
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  9. #9
    Senior Member RACING JUNKIE
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    Quote Originally Posted by hink
    Quote Originally Posted by RROP89
    I found another source identifying alloy % content mark: "010 and 020." The first being tin and the second nickel. I got the 010 mark but not the 020 so that follows with what you found - oh well. I'm about to take it in and get it magged and all that...will help me decide how to build on it. First engine build, going to be either 406 or 427.

    tks for info guys!
    James
    Sonic test it before you do anything!!!
    cant stress this one enough...lol
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by zipper06
    Thanks fast75vega, for passing along those #'s. A person never gets too old too learn something new and i just did ops:

    Zip.
    no problem... that why we are all here
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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