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Technical Big block Chevy ID

Discussion in 'The Hokey Ass Message Board' started by aerorocket, Apr 11, 2018.

  1. aerorocket
    Joined: Oct 25, 2007
    Posts: 488

    aerorocket
    Member
    from N.E. P.A.

    I have an old suburban that someone stuck a big block in but I cannot seem to identify it. The last 3 numerals stamped on the pad are 7FD. I cannot see the casting numbers on the back of the block as it is too tight to the fire wall. I tried using an inspection camera with no luck. It is chevy orange but could have been painted years ago. I guess I can cut a hole in the firewall if need be. It runs like a top. Also there are no serial numbers stamped on the pad so I suspect it is a replacement or a marine block.
     
  2. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,596

    56sedandelivery
    ALLIANCE MEMBER

    Remove a valve cover to see the head casting numbers; that may also give you an idea what the engine might be.
    I am Butch/56sedandelivery.
     
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 42,702

    squirrel
    Member

    no idea what it could be with that limited info.

    if it has a small damper, it's probably a 396 or 402. If it has a big one (with the weight on the back side) it's probably a 454.

    If it has a weighted flywheel, it's also probably a 454.
     
  4. It could also have an 8 inch damper with no weight and be a 427/425
     
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  5. squirrel
    Joined: Sep 23, 2004
    Posts: 42,702

    squirrel
    Member

    yup, that's why I said "probably".

    feel for the weight on the back of it...
     
  6. chevy57dude
    Joined: Dec 10, 2007
    Posts: 4,845

    chevy57dude
    Member

    Can you reach the rear pad to press a lump of putty on it? Then peel it off and read the reverse impression.
     
  7. aerorocket
    Joined: Oct 25, 2007
    Posts: 488

    aerorocket
    Member
    from N.E. P.A.

    Can't reach or see the casting numbers. Small damper so its probably a 2 bolt 396 or 427. I guess I'll have
    to tear into it to find out for sure. Got it for free so the price was right. Also has a 780 dual feed Holley
    mounted on a square port weiand intake; I'll have to pull a valve cover to ID the heads but I bet they are
    oval port. Thanks guys for the suggestions.
     
    squirrel likes this.

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