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how to tell a 350 & a 327 apart?

Discussion in 'The Hokey Ass Message Board' started by turdchazer, Dec 6, 2008.

  1. turdchazer
    Joined: Dec 4, 2008
    Posts: 644

    turdchazer
    Member Emeritus
    from Spokane

    What are some of the tell tale signs, besides a block stamping , that says this engine is a 350 or is this a 327
     
  2. dudley32
    Joined: Jan 2, 2008
    Posts: 2,151

    dudley32
    Member

    327 always has a valley vent at the back of the block just behind the intake manifold so does a 283...
     
  3. Deuce Roadster
    Joined: Sep 8, 2002
    Posts: 9,519

    Deuce Roadster
    Member Emeritus

    True ... but so does the 1967 Camaro 350 block. It is a one year deal but they do exist.
     
  4. Von Rigg Fink
    Joined: Jun 11, 2007
    Posts: 13,426

    Von Rigg Fink
    Member
    from Garage

    I think the only way to tell for sure is the stamped numbers on the pad in front of the passenger side head.(on the block).that is with out taking it apart..

    squirrel!..you out there?
     

  5. dudley32
    Joined: Jan 2, 2008
    Posts: 2,151

    dudley32
    Member

    to deuce roadster...
    ok ...realy?...I didn't know that... wonder why they would revert back? to relieve pressure?...interesting...new info thanks...
     
  6. 32Rules
    Joined: Mar 17, 2007
    Posts: 202

    32Rules
    Member

    1968 and 1969 327's did not have the crankcase vent cast into the block. My 67 Pace Car had the correct 350 with crank cas ventilation cast in block. Only year for that ona 350. 327's were phased out for the new yuk 307 in 1969
     
  7. balancers are different,flange on crankshafts are different,casting #'s
     
  8. LUX BLUE
    Joined: May 23, 2005
    Posts: 4,407

    LUX BLUE
    Alliance Vendor
    from AUSTIN,TX

    some 327's also do not have harmonic balancer bolts. I don't know what years that is or is not specific to, but I do know it's not like that on chreefiddies.
     
  9. OldSub
    Joined: Aug 27, 2003
    Posts: 1,064

    OldSub
    Member Emeritus

    Measure the stroke. If the stroke is 3.25 its a 307 or 327. If its 3.48 its a 350.

    So many of the small blocks available have been built from collections of parts that I'd be cautious of trusting any external sign that isn't a measurement.
     
  10. Actually the 283 was phased out in late '67 for the 307 that came out in '68 models. The 327 was phased out in '69 and it's replacement was the already available 350.

    As far as breather tube in 1967 350's...... very true (one year only block). No breather tube in 68-69 327's and journal size also increased as GM was tooling up for the swap over to the 350.
     
    Deuces likes this.
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 52,400

    squirrel
    Member

    To be sure, measure the stroke...for clues, look for the small damper, draft tube hole, valve covers with the little rectangle in the middle, etc.
     
  12. To the best of my Knowledge all 327 blocks have a small Vertical web on the Front of the block inboard of the Passenger side water pump mount flange next to a 1/8" pipe plug. No 350 blocks have the web or plug. Also the distance between the pump flange and the Web is different between 283 and 327.
    The Wizzard
     
  13. squirrel
    Joined: Sep 23, 2004
    Posts: 52,400

    squirrel
    Member

    this rib?
     

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  14. That would be Correct. To the best of my Knowledge "no" 350 has that rib. Also the Grove is wider on a 283 than a 327. You can feel it with your Finger when they are side by side.

    The Wizzard
     
  15. Terry
    Joined: Jul 3, 2002
    Posts: 1,825

    Terry
    Member

    That's the way I was taught too.

     
  16. HRK-hotrods
    Joined: Sep 26, 2007
    Posts: 922

    HRK-hotrods
    Member

    Just an FYI, the 307 wasn't available in a Camaro until midyear 69'. It replaced the 327 as the base V8...

    As far as the 307 being a YUK motor, have YOU ever had the pleasure of playing around with one? They are GROSSLY underestimated. With a 283 bore and a 327 stroke, they put some pretty good horsepower/torque out for the size and they're good on gas too... They rev quick and have a strong bottom end... Change the heads, put in a better grind cam and you got something;)
     
  17. conn.rod
    Joined: Nov 29, 2006
    Posts: 60

    conn.rod
    Member
    from atlanta

    check the casting numbers on mortec.com you can ck small and bbc block and head castings
     
    razoo lew likes this.
  18. Grumpy Ed
    Joined: Mar 21, 2017
    Posts: 4

    Grumpy Ed

    You are right on with the 307. I had a 71 Nova with a 307, added a set of Double Hump heads (1.94) and a mild cam with a Holley 600 and Edelbrock Torker intake, headers, and that car woke up. Put a shift kit in the Turbo 350 trans also.
     
  19. samurai mike
    Joined: Feb 24, 2009
    Posts: 534

    samurai mike
    Member

    what are you talking about? a 350 buick and a 327 packard look nothing alike!
     
    54vicky likes this.
  20. Anorexicvega
    Joined: Jan 13, 2017
    Posts: 2

    Anorexicvega

    The 67 350 and 302 has the rib and plug. The 68 may have them too.
     
  21. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 6,695

    56sedandelivery
    Member Emeritus

    Lots of large journal 327's were built using 350 blocks, especially the 4 bolt blocks. The compression height of the piston (1.67 for a 327; 1.56 for A 350), or the casting number on the crankshaft should tell you what it actually is.
    I am Butch/56sedandelivery.
     
  22. rudestude
    Joined: Mar 23, 2016
    Posts: 2,948

    rudestude
    ALLIANCE MEMBER

    Just thought I would throw this info in...its from the How to Hot Rod Small-block Chevys....HP Books 20190228_235541.jpeg 20190228_235510.jpeg 20190228_235500(0).jpeg 20190228_235439(0).jpeg 20190228_235434.jpeg 20190228_235401.jpeg 20190228_235333.jpeg 20190228_235306.jpeg 20190228_235231.jpeg

    Sent from my SM-T387V using The H.A.M.B. mobile app
     
    tb33anda3rd and Deuces like this.

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