Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Inline six ID

Discussion in 'The Garage' started by 1979jimmy350, Dec 18, 2005.

  1. 1979jimmy350

    1979jimmy350 1/2 ton status

    Joined:
    Mar 24, 2004
    Posts:
    3,069
    Likes Received:
    0
    Location:
    Ann Arbor Mi
    I have a old inline six that i am trying to figure out what it is. I know it is pretty old because it has points and the intake manifold is not cast to the head. the casting number that i found looked like this
    8921968
    GM
    66

    it also had the numbers 259 next to the oil dipstick. I am trying to find out what year and CID this engine is
     
  2. u2slow

    u2slow 1/2 ton status

    Joined:
    May 9, 2001
    Posts:
    2,217
    Likes Received:
    0
    Location:
    BC Canada
    194, 230, and 250 engine mount bosses are straight across from one another.

    292 bosses are offset by a couple inches.
     
  3. BadBob

    BadBob 1/2 ton status

    Joined:
    Aug 14, 2005
    Posts:
    158
    Likes Received:
    0
    Location:
    Lyndon, KS
    Look at the casting number a little closer. I bet it's 3921968. That'd be a 230 or 250. I don't remember when the 230 went out of production, but I'm pretty sure 1966 was the first year of the 250.
     
  4. u2slow

    u2slow 1/2 ton status

    Joined:
    May 9, 2001
    Posts:
    2,217
    Likes Received:
    0
    Location:
    BC Canada
    The 250 replaced the 230 for '66.;)
     
  5. BadBob

    BadBob 1/2 ton status

    Joined:
    Aug 14, 2005
    Posts:
    158
    Likes Received:
    0
    Location:
    Lyndon, KS
    doesn't leave many choices then ;)
     
  6. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

    Joined:
    May 23, 2005
    Posts:
    2,241
    Likes Received:
    0
    Location:
    back home in Houston
    ::HIJACK:: How many of you guys still run straight six motors?
     
  7. 3 on the tree

    3 on the tree 1/2 ton status

    Joined:
    Oct 16, 2004
    Posts:
    3,970
    Likes Received:
    0
    Location:
    gunnison colorado
    I do; 70K5, 3 speed, 250 with 72K orig miles on it. GREAT gas mileage.
     
  8. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,577
    Likes Received:
    945
    Location:
    Massachussetts
    I used to have 2 of em..

    My 81 G10 Van,and 79 C10 I have both were originally equipped with 250 straight sixes..but both of them were the less desireable "Camelhumper" versions with the 2 BBl "Vari Jet" carbs and integral intakes..my Van motor ran ok,but it was way underpowered..it took forever to hit 65 mph,and could only maintain 49 mph on hills!--it would downshift into second gear a lot,and it went slower than it did if you babied the gas pedal,and stayed in third..I later put an equally anemic 73 307 V8 in it..not that much better,but it got better mpg by 3 mpg..still a slug though,with 2.73 gears and 235/15 tires..I think the six had more torque!...:rolleyes:

    The 250 in the 79 C10 had 116,000 original miles,and ran pretty sweet the first 2 years I had it--I put an Edelbrock 600cfm carb on it with a homebrew carb adapter I made..it ran well and got 15 mpg..I disconnected the secondary barrels linkage..it didn't need them,it ran better just using the primary barrels..it had much better power and torque than the van's 250 did with the stock 2 barrel rochester ..

    But one day while sitting in traffic,I heard a "snap" noise,and it started skipping..a few days later on the highway,it REALLY started making BAD noises..and smoked like crazy,and I lost at least 2 cylinders..when I got home 14 miles later,I yanked the motor out and got a 305 V8 from my friend who was junking an 86 G10 van --when I was done swapping the motor,I took the head off the 250,and #6 piston was missing a large chunk out of its top,and I could see the top ring showing!..:eek1: ..it didn't scar the cylinder wall,it probably could have been rebuilt..but I used it to add weight to my other truck I was junking instead..I don't like the "Camelhumpers" with integral intakes much..kind of a POS..:p:

    I like the straight sixes..but the ones before 1973 were MUCH more durable..I think they got better mileage with the 1 BBL carb than the later 2 BBL ones,though the integral head motors did have a BIT more sack than the 1 BBL...not enough to justify the decrease in durability IMO..

    I liked the 235 and 261 sixes even better..they were a lot more torqey than the 194,230,250 motors..the 292 was the best six in the later years,had the longest stroke and most torque--but were pigs on gas..nearly indestructable though..:crazy:
     
  9. TruckNutzDude

    TruckNutzDude 1/2 ton status

    Joined:
    Mar 31, 2003
    Posts:
    3,532
    Likes Received:
    0
    Location:
    Agawam, MA
    I'm thinking of putting one in my S10 :eek1: A buddy of mine has a 250 from his '82 K10 (pretty sure that's what it came from) and my 2.8 is getting very tired...
     
  10. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,577
    Likes Received:
    945
    Location:
    Massachussetts
    say what??

    I don't think a straight six will fit into an S-10..you'd have to stretch the nose out another foot!..a small block is about 29" from the balancer to the flexplate,and a straight six is about 33 inches..doubt if it would fit,but I've never seen one,so maybe its possible..

    If your friends 250 is an "Integral Head" with the camel humped valve cover,I'd leave it where it sits!.best use I've seen for them is a water pump motor for local cranberry bogs!--.a better swap would be a 4.3,but you'd need a donor truck for the mounts and other goodies..someone I talked too said a 3.1 Camaro motor will bolt up in place of a 2.8..but I'm not that familiar with S-10's..or many other 90's and up GM's..:crazy:
     
  11. greywolf

    greywolf 1/2 ton status

    Joined:
    Oct 18, 2001
    Posts:
    1,606
    Likes Received:
    0
    Location:
    ST.PAUL TX USA

    me 2 1982 k10 250 315xxx needing rebuild and nonintegral head
     
  12. 3 on the tree

    3 on the tree 1/2 ton status

    Joined:
    Oct 16, 2004
    Posts:
    3,970
    Likes Received:
    0
    Location:
    gunnison colorado
    In the mid 90s, GM built a RWD version of the 3.4 for Camaro and Firebird use only. It is the same block as the 2.8, but no mech fuel pump boss. I put one in my Cherokee in place of the 2.8. It runs much better and gets better gas mileage. FWIW, GM also sells a crate 3.4 HO to replace 2.8 motors in S10s. The swap is pretty easy, just change over all the tin, and have the flywheel or flexplate neutral balanced.
     

Share This Page