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sbc questions, 327 crankshaft

Discussion in 'The Hokey Ass Message Board' started by 54BOMB, Aug 25, 2008.

  1. 54BOMB
    Joined: Oct 23, 2004
    Posts: 2,101

    54BOMB
    Member

    When I bought my coupe project the guy included an engine that he said was a 1968 327. Well this weekend I took it all apart to inspect it and found that while the casting number shows it was used for many engines it has a 3.5 inch stroke, making it a 350. So from my understanding the 350 and 327 used a 4 inch bore and a 5.7 inch rod. So its just the crank thats different? Since its a large journal block I cant find a late 327 crank in any of the catalogs. What am I missing, is it more people just go with a 350 or is it just rare and no one makes it?
     
  2. Hackerbilt
    Joined: Aug 13, 2001
    Posts: 6,243

    Hackerbilt
    Member

    Pin location in the piston is different as well...
     
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 46,117

    squirrel
    Member

    The large journal 327 crank was also used in the 307 engine, and it should not be too hard to find a used cast 307 crank. Steel large journal 327 cranks are hard to find.

    Why do you want a 327? if the magic number is what you're after, you could always leave it as a 350 and put a 327 emblem on the valve cover....
     
  4. Hackerbilt
    Joined: Aug 13, 2001
    Posts: 6,243

    Hackerbilt
    Member

    Everything I ever had was 350 powered...
    Any noticable driving difference between a warm 327 and a similar 350?
    How about visual? eg crank balancer differences???
     
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  5. are you sure about that stroke? how did you measure it? a 350 has a 3.480 stroke , 327 has 3.25
     
  6. 54BOMB
    Joined: Oct 23, 2004
    Posts: 2,101

    54BOMB
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    Mainly I was just asking for the knowledge. Im not too concered with telling people its a 327 or 350 or any of that, I just didnt know.
     
  7. squirrel
    Joined: Sep 23, 2004
    Posts: 46,117

    squirrel
    Member

    The 327s (and 307s) had a smaller balancer, some guys will spot that but not many.

    If it's a mild street engine, and it needs to be rebuilt anyways, then it wouldn't be much trouble to get a 307 crank and 327 pistons and get it balanced and have a real 327.
     
  8. 54BOMB
    Joined: Oct 23, 2004
    Posts: 2,101

    54BOMB
    Member

    Thats what I was thinking , I was going to use new internals any way, and since the block was used for several different engine configurations I thought why not, I really liked the 327 I had in another car. Then I saw that Scat and Eagle dont have cranks for the late 327. So I was curious why.
     
  9. pittsburgholdschooler
    Joined: Jul 30, 2007
    Posts: 174

    pittsburgholdschooler
    Member

    Early ( 62-67 ) 327 are small journals ( Bearing Surfaces) , while mid year 68-69 are large journal , the 307 crank should interchange , using 3.25 rods....also....dont worry about cast or forged...no difference in your application , I ran a cast crank 327(69) with 11.25 compression ,in my Vega bracket car for YEARS...no problem...make sure your surfaces are straight and clean , lube everything , and use GOOD, BRAND NAME , bearings, pistons , oil pump & gaskets.... stay away from the mail order junk....:eek:
     
  10. Shaggy
    Joined: Mar 6, 2003
    Posts: 5,208

    Shaggy
    Member
    from Sultan, WA

    Also there is a company that makes bearing spacers so you could use an early 327 and rods or as I was going to do, a 283 crank and make it a 302 with the right pistons, i was going to do it until i just found a late DZ302 crank for a good price

    The reason i didnt go a early 327 block is because they have a little weaker mains, and mine gt stolen and i had a deal on a good 350 block
     
  11. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,735

    Roothawg
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    Supply and demand.
     
  12. treb11
    Joined: Jan 21, 2006
    Posts: 3,458

    treb11
    ALLIANCE MEMBER

    casting codes are only a starting point. the basic casting can (theoretically) be used for anything. the actual applicaiton the engine was built for can be determined by looking up the engine code on the front of the block. reference www.nastyz28.com
     
  13. 54BOMB
    Joined: Oct 23, 2004
    Posts: 2,101

    54BOMB
    Member

    Yep I looked all over the 'net yesterday on info for this. Thats one of the sites I saw.
     
  14. Roothawg
    Joined: Mar 14, 2001
    Posts: 19,735

    Roothawg
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  15. tripleduece
    Joined: Jan 29, 2007
    Posts: 1,142

    tripleduece
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  16. yea, i was thinking about the 302. i have a 327 early small journal and a few 283's mainly because the like the early evap set-up.....and always looking for more cheap :).
     
  17. Not completely true. High HP 327's (and Z-28 302's) had the big 8" balancer. For the most part, most SBC balancers, regardless of diameter will interchange. Unless of course it's externally balanced, like the 400 small block
     
  18. 54BOMB
    Joined: Oct 23, 2004
    Posts: 2,101

    54BOMB
    Member

    Ironic this post came back up today, I had a 327 crank show up on my door step this afternoon.
     

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