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Still in a quandary over this SBC 350??

Discussion in 'The Hokey Ass Message Board' started by tapkoote, Aug 22, 2013.

  1. tapkoote
    Joined: Feb 6, 2013
    Posts: 70

    tapkoote
    Member

    Well today through me another curve ball.
    This 49 chev i bought with a vette engine-
    morfed to a 350 truck engine and today I find out the 350 starters won't fit, Auto zone and Napa had starters with offset bolt holes. Mine is straight.
    I got a starter for a 305 El Camino/chevell/truck?
    Did chevy have a light duty truck they put a 305 in?
    Does this starter prove it's a 305?
    Did they ever use the starter with the straight bolt pattern in a 350?
    I might pull the oil pan to check the crank through, how
    much stroke do the 305 and 350 have?:confused:
    Thanks for any help
    Pat
     
  2. Dynaflash_8
    Joined: Sep 24, 2008
    Posts: 3,023

    Dynaflash_8
    Member
    from Auburn WA

    Straight bolt pattern is 153 tooth. Across is 168



    Posted using the Full Custom H.A.M.B. App!
     
  3. dirtracer06
    Joined: Sep 29, 2009
    Posts: 198

    dirtracer06
    Member

    The casting numbers on the back passenger side of the block should get you close...there is also casting numbers on the heads if you pull the valve cover off....the crank will also have casting numbers on it....might get lucky and have id numbers stamped on the tab on the front of the block just below the head...yes chevy did use 305s in some of the trucks....

    but my 71 had the original 4 bolt main 350 and the starter in it had the straight line starter bolts...it also had a smaller nose cone to fit the bell housing....bitch to find...ended up just swapping the nose cone to the new starter....
     
    Last edited: Aug 22, 2013
  4. Speed Gems
    Joined: Jul 17, 2012
    Posts: 3,031

    Speed Gems
    Member

    The 305 and 350 chevy have the same 3.48" stroke.
     

  5. 5559
    Joined: Oct 25, 2012
    Posts: 362

    5559
    Member
    from tn

    check the back side of the harmonic bal.--if it has a straight back its a 350, if you can curl your fingers into a groove its a 305. This only works if the bal. has'nt been changed
     
  6. 54nomore
    Joined: Nov 5, 2012
    Posts: 137

    54nomore
    Member
    from illinois

    Hey "tap", I was checking out your other thread about ID'ing your motor but never chimed in. According to my reference book, your TXD engine code is from a '75 truck as others posted but not just in 3/4 ton and 1 ton. My book shows it in 1/2 tons as well with a 2 bbl carb rated at 145 net HP as opposed to the 160 HP in the other trucks with a 4 bbl.
    As far as the 305 goes, it did not appear until '76 and it shares the same 3.48" stroke with the 350.

    And finally, about that nine digit stamping on the front of the block:

    C52xxxxxx decodes as:

    C = Chevy truck, 5 = 1975, 2 = the assembly plant where the truck was built (usually a letter, could it be a Z?). The last six digits would match the last six digits in the trucks VIN.

    Hope this helps in some way;)
     
  7. 133
    Joined: Dec 30, 2003
    Posts: 1,655

    133
    Member

    ditch the 350 and get ya something else. haha
     
  8. gimpyshotrods
    Joined: May 20, 2009
    Posts: 17,903

    gimpyshotrods
    ALLIANCE MEMBER

    Just run it. With a mild cam, manifold, and carb, it will do just fine.
     
  9. 54nomore
    Joined: Nov 5, 2012
    Posts: 137

    54nomore
    Member
    from illinois

    Forgot to mention that your engine would have been backed by a manual trans. originally according to the code. I can't imagine that that would have any affect on the way the block was drilled for the starter, but who knows?
     
  10. tapkoote
    Joined: Feb 6, 2013
    Posts: 70

    tapkoote
    Member

    Than might solve part of it.
    Speed gems
    I'm not a car guy, but I've done triumph/harley/moto guzzi work , to ask. How do they get 305 cu. in. out of a
    4 inch bore block with the same stroke as a 350 with a 4 inch bore?
    5559
    Had to go "feel", it's flat then a hump of rotten rubber,
    then in.????
    54nomore
    Yer killing me, now I'm down to 145hp!!:eek: oh well
    Still don't get the same stroke on a 350 and 305 with 4 inch bore. Some how i lost 45 cu. in.
    Numbers
    block 3970010
    heads 3998991--C18A--M3
    block stamp VOT30TXD
    Thanks for the help Pat
     
  11. gimpyshotrods
    Joined: May 20, 2009
    Posts: 17,903

    gimpyshotrods
    ALLIANCE MEMBER

    The 305 does not have a 4" bore.
     
  12. 54nomore
    Joined: Nov 5, 2012
    Posts: 137

    54nomore
    Member
    from illinois

    305 bore is only 3.736"

    C 18 A (maybe C 18 4)? looks like a date code. Probably March 18, 1974 which could mean the heads have been replaced. Or it could be G 18 4 which would be July of '74 which could jive with a very early built '75 model.

    And remember the 145 was a net rating probably closer to 200 gross. The numbers don't mean much anyway as long as the seat of the pants feel satisfies.
     
  13. mustang6147
    Joined: Feb 26, 2010
    Posts: 1,847

    mustang6147
    Member
    from Kent, Ohio

    doesn't 327 have a 4 inch bore?

    I had a similar issue with my 86/87 350 block.... Starter, flywheel... it was tough
     
  14. Larry T
    Joined: Nov 24, 2004
    Posts: 7,661

    Larry T
    Member

    The starter with the straight across bolts fits the small flexplate, the diagnal bolt pattern fits the large flexplate. You can use either flywheel on 265-350 engines, as long as the engine is neutral balanced and most engines are drilled to mount either starter. Since your engine originally came with a standard, it would have the flywheel changed over to a flexplate. Either one would bolt up, so it's not a way of identifying the engine.
     
  15. 54nomore
    Joined: Nov 5, 2012
    Posts: 137

    54nomore
    Member
    from illinois

    Yep. 4 inch bore, 3.25 stroke.

    I should have quoted mustang6147, but I've never used that function.
    Hell, I'm still halfway Skeered of computers:)
     
    Last edited: Aug 22, 2013
  16. RiffTannen
    Joined: Jun 17, 2013
    Posts: 77

    RiffTannen
    Member
    from Chicago

    3970010 is definitely a 350. I have an engine with the same block code. Mine is a 350 ci with 4 bolt main and it has the staggered starter holes.


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  17. RiffTannen
    Joined: Jun 17, 2013
    Posts: 77

    RiffTannen
    Member
    from Chicago

  18. mart3406
    Joined: May 31, 2009
    Posts: 3,055

    mart3406
    Member
    from Canada

    -------
    Yes. Maybe this will help clear
    your mind as to what is what.

    282 - 3.67 Bore X 3.10 Stroke
    265 - 3.750 Bore X 3.00 Stroke
    267
    - 3.50 Bore X 3.48 Stroke
    283 - 3.875 Bore X 3.00 Stroke
    302 - 4.00 Bore X 3.00 Stroke
    305 - 3.736 Bore X 3.48 Stroke
    307 - 3.875 Bore X 3.25 Stroke
    327 - 4.00 Bore X 3.25 Stroke
    350 - 4.00 Bore X 3.48 Stroke
    400 - 4.125 Bore X 3.75 Stroke

    --------------
    Mart3406
    ==============
     
  19. flynbrian48
    Joined: Mar 10, 2008
    Posts: 7,046

    flynbrian48
    Member

    I thought ALL 350's swapped into anything were 'Vette engines? Does this mean if I put the 350 (that came in a '93 van) on my garage floor into something it's NOT a 'Vette engine? I was going to put aluminum valve covers on it and everything. Much sadness...

    Brian
     
  20. Sure, Brian, just like the 350 in the '91 van I drive as a beater is also a Corvette engine. Chevy just put it in my van by mistake. I can tell, because someone had to put a reman trans in it in the past.
     
  21. I thought all 350's on the ground where vette engines ? :rolleyes: :p
     
  22. davidbistolas
    Joined: May 21, 2010
    Posts: 962

    davidbistolas
    Member

    Hey, my 350 actually IS out of a corvette. I have the corvette to prove it. But I'm just going to tell folks it's out of a monza.
     
  23. txturbo
    Joined: Oct 23, 2009
    Posts: 1,771

    txturbo
    Member

    That casting number was used on more than just 350s......so that doesn't prove without a doubt it's a 350.


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  24. hotrod1948
    Joined: Jan 17, 2011
    Posts: 464

    hotrod1948
    ALLIANCE MEMBER
    from Milton, WI

    Learned something new, I thought all '010' blocks were 350s. What other sizes did the 010 block get used for?
     
  25. Starters for small block chevies come in straight and staggered holes. You buy one for whatever engine they list with straight holes. Not a quandry at all the starter does not care how many cubes you got it is a small block chevy, and an SBC is an SBC.

    The engine size for a truck has no bearing on if the truck is light duty or not it has to do with how much the original buyer wanted to spend or what the dealer had on the lot. A half ton chevy is a half ton chevy, a 3 quarter ton is a 3 quarter ton and so one and so forth. unless you were to buy one of the '70s heavy chevies which was a towing/camper package and it was heavier springs mostly no major engine differences.
     
    Last edited: Aug 22, 2013
  26. Larry T
    Joined: Nov 24, 2004
    Posts: 7,661

    Larry T
    Member

    327s and I THINK some 302s.
     
  27. mart3406
    Joined: May 31, 2009
    Posts: 3,055

    mart3406
    Member
    from Canada

    Yes. A "010" casting number simply
    means that the block was cast for and
    machined with, a 4 -inch bore. Nothing
    more nothing less.

    Mart3406
    ===========
     
  28. Knowing the year of the block helps. There was a point when they no longer produced 302s and 327s. Also decoding the vin is a good way to tell what the engine is and what it was destined to be bolted into.

    None of this has any bearing on the starter though. GM made two classes of starters, standard and high torque. They both came in staggerd and straight bolt patterns. They also used the same starter on big blocks and small blocks.

    Now that I have introduced the big block small block into the discussion here is a tid bit for you fellas, big block chebbies and small block chebbies have the motor mounts in the same location, they are the same distance from the bell housing to the motor mount and the length difference is in front of the motor mounts. So you can bolt a big block in place of your small block as long as you still have room for width and radiator clearance.

    OK it is off topic but there is no charge for the info.
     
  29. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 8,149

    theHIGHLANDER
    Member

    I have an "010" as well. Decodes to either truck or L-82 Vette, so I can actually say I might have the uber-desirable "vette motor". I probably won't though. L-82s were sorta lame IMO. I beat one once with SWB 74 Chevy van with a 350 2bbl:eek:
     
  30. maybe I look at things different than most. Once you change the cam, intake, work the ports and etc it is no longer a "vette" motor, it is just another SBC.

    The only reason a "Vette" motor would be more desirable is if you leave it stock so that it is a "Vette" motor.

    I reworked a '57 "Vette" motor to go in a '55 stude once. It took .030 and .010x.010 to clean it up and by the time I was done the only thing "Vette" on it was the block and the turned crank. But the ol' stude ran low 12s on street tires and it never would have done that with the "Vette" motor.
     

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