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.

Is this a 305 or 350?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by DUKSRULE, Jan 1, 2004.

  1. DUKSRULE

    DUKSRULE 1/2 ton status

    Joined:
    Nov 25, 2001
    Posts:
    303
    Likes Received:
    0
    Location:
    Va Beach Va
    I have and 86 K20 pickup. It has a T400 and a 208 I think. When I bought it the guy said it was a 305 but every time I go to a parts store they only list this truck coming with a 350. It is an old fleet truck with 87K original miles so I am doubting that the engine was swapped. It has a 2 barrel carb also. Any way to tell if it is a 305 or 350?

    Thanks
     
  2. unick

    unick 1/2 ton status

    Joined:
    Aug 16, 2003
    Posts:
    4,286
    Likes Received:
    0
    Location:
    San Diego Comufornia
    look up the vin number.
     
  3. DUKSRULE

    DUKSRULE 1/2 ton status

    Joined:
    Nov 25, 2001
    Posts:
    303
    Likes Received:
    0
    Location:
    Va Beach Va
    Look it up where?
     
  4. unick

    unick 1/2 ton status

    Joined:
    Aug 16, 2003
    Posts:
    4,286
    Likes Received:
    0
    Location:
    San Diego Comufornia
    do a search on yahoo for vin check and pick one that looks good.
     
  5. onetwistedk5

    onetwistedk5 Registered Member

    Joined:
    Oct 10, 2002
    Posts:
    54
    Likes Received:
    0
    get the engine numbers off the back passenger side of the block.
    Mortec.com has all the casting numbers you need.
    Hope it helps
     
  6. Z3PR

    Z3PR Banned

    Joined:
    Mar 30, 2002
    Posts:
    19,217
    Likes Received:
    0
    Location:
    Everywhere
    Have a mechanic look at the harmonic balancer and tell you if it's a 350 or 305.
     
  7. bryguy00b

    bryguy00b 3/4 ton status

    Joined:
    Apr 7, 2002
    Posts:
    5,587
    Likes Received:
    0
    Location:
    Rochester, N.Y
    i tyred that haramic balancer thing they are both the same..looked at the one on my blazer, my truck, and my dads, the blazer has a 305..dads has a 350..and they were both the same..ive also heard that they are..
     
  8. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    somebody swapped dampner then, you need to get numbers off front of engine and get your vin code, or at least trhe first half of it and post it here

    the numbers on front of engine are stamped on flat spot just right above timing cover behind alternator on engine block cant miss the ledge, clean it off and get last three letters and postr them here
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    I second the suffix codes. (behind alternator)

    That is more accurate than the casting numbers, and thus will tell you more info. (year, application, size, HP rating)
     
  10. 85scottsdale

    85scottsdale 1/2 ton status

    Joined:
    Dec 22, 2003
    Posts:
    283
    Likes Received:
    0
    Location:
    Lewisville, NC
    An 86 3/4 ton with a 2bbl carb doesn't make sense, It should be a 4bbl especially on a 3/4 ton. I wasn't aware they had 2bbl carbs in 86. Also a 3/4 ton would have never come with a 305, I believe the 350 was probably the base engine for a 3/4 ton. The only way to find out which one it is would be to get the numbers off the back of the block and the front pad right behind your alternator and right in front of the passenger side head.
     
  11. bryguy00b

    bryguy00b 3/4 ton status

    Joined:
    Apr 7, 2002
    Posts:
    5,587
    Likes Received:
    0
    Location:
    Rochester, N.Y
    yea 2 barrels only came on the inline 6's...i cant imagine that egine would run good at all with a 2 barrel if it even does!?
     
  12. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    [ QUOTE ]
    yea 2 barrels only came on the inline 6's...i cant imagine that egine would run good at all with a 2 barrel if it even does!?

    [/ QUOTE ]

    Not true. Many 305s had 2 barrel carbs, but not even a V6 in 1986 would have had a 2 barrel. The 4.3s even came with Q jets that year.

    3/4 tons did indeed come with 305s sometimes too. Just because it's a 3/4 ton doesn't mean that it can't have a 305.
     
  13. bryguy00b

    bryguy00b 3/4 ton status

    Joined:
    Apr 7, 2002
    Posts:
    5,587
    Likes Received:
    0
    Location:
    Rochester, N.Y
    /forums/images/graemlins/blush.gif my mistake lol...but i satill cant imagaine a 350 with a 2 barrel!
     
  14. bryguy00b

    bryguy00b 3/4 ton status

    Joined:
    Apr 7, 2002
    Posts:
    5,587
    Likes Received:
    0
    Location:
    Rochester, N.Y
    wait..what am i saying..im a moron..i knew v8's had 2 barrels..even my dads impala with a 283 has one on it /forums/images/graemlins/rotfl.gif

    good greif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/rolleyes.gif
     
  15. beater_k20

    beater_k20 Banned

    Joined:
    Dec 9, 2003
    Posts:
    10,276
    Likes Received:
    0
    Location:
    Elkhart, IN
    in 1986, no 2bbl carbs were sold on V8s. everything had a QJet on it, including the 4.3, which carried a carb from 85-86
     
  16. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    Parts manual backs you up. /forums/images/graemlins/thumb.gif

    '85-86 your only two options were the monojet or the quadrajet, monojet being ONLY on the 292. Various configurations/styles of Q-jet and two of the monojet, but only those two basic carbs.
     
  17. 85scottsdale

    85scottsdale 1/2 ton status

    Joined:
    Dec 22, 2003
    Posts:
    283
    Likes Received:
    0
    Location:
    Lewisville, NC
    [ QUOTE ]
    /forums/images/graemlins/blush.gif my mistake lol...but i satill cant imagaine a 350 with a 2 barrel!

    [/ QUOTE ]

    All of the 400 small blocks came with just 2bbl carbs, most of them anyway they may have offered a 4bbl with it in the later years that it was available.
     
  18. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    yes 80 and up were 4bbl, and 79 and older were either 2bbl or 4bbl depending on RPO of engine, there were several of each size engines, each with different torque and HP ratings, all depending on what vehicle they were put into, there were two types of 2bbbl carbs and all the 78 and older 250 were 1 bbl, 79 and up some of them were emissions 2bbl intake and 2 pipes exhaust junk crap.

    most all 80-up 4bbl carbs were the E4ME, but some on heavier GVW were normal E4M carbs

    the 2bbl carbs were mainly manual choke through 68 and hot spring and vacuum heat type 69-79, this all depended on RPO code and application of engine,. the higher rated engines were of course the 4bbl ones, in trucks and in cars both

    2bbl v8s were damn common, but nowadays most all have been swapped to 4bbl intakes by now, so you hardly see any original 2bbl ones now,


    i see that we are getitng a bit off topic here, but at least soem of us are learnign new things /forums/images/graemlins/laugh.gif
     
  19. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

    Joined:
    Aug 28, 2002
    Posts:
    9,097
    Likes Received:
    144
    Location:
    california
    Maybe it was a credit option that the fleet picked for it. YOu used to be able to buy a 1ton with a 4.3 V6 if you wanted credit back towards the truck.

    And I have never seen a 400 SB with a 2brl.
     
  20. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    [ QUOTE ]
    Maybe it was a credit option that the fleet picked for it. YOu used to be able to buy a 1ton with a 4.3 V6 if you wanted credit back towards the truck.

    And I have never seen a 400 SB with a 2brl.

    [/ QUOTE ]

    alas, well you may have never seen oen but here you go:

    year, stamping suffix code, tranny, RPO code, HP, carb bbls, vehicle model/body
    1972 CDM 400 t/h, pol/taxi, Calif LF6 170 2 Caprice
    1972 CKP 400 tur hydro trans. 170 2 Caprice
    1970 CLK 400 tur 350 265 2 full size
    1970 CRH 400 265 2 A
    1973 CSA 400 tur hydro trans. LE2 U 175 2 B
    1973 CSB 400 tur hydro trans. LE2 U 175 2 Caprice
    1973 CSC 400 t/h trans., Calif LE2 U 175 2 Caprice
    1973 CSD 400 t/h trans., Calif LE2 U 175 2 Caprice

    1976 CSJ 400 a/t LT4 175 2 B
    1973 CSK 400 tur hydro trans. LE2 U 175 2 B
    1973 CSM 400 t/h trans., Calif LE2 U 175 2 Caprice
    1974 CSU 400 t4OO NB2 U LT4 175 2 full size
    1974 CSW 400 a/t U LT4 175 2 B


    i cpuld go on forever, there were billions more 2bbl than 4bbl SBC 400's, alot of camaros cparices vans trucks were 2bbl 400 equipped

    like i said, most have all been swapped to 4bbl intake and carb by now,
    and do you have RPO code info to prove 4.3 was available in 30 series ?

    i highly doubt such was available

    292 4.8L was std equipment for most all 30 series trucks most years however,
     

Share This Page