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.

I've been lied to! It's a 305! Now, just a couple questions.

Discussion in 'The Garage' started by divorced, May 29, 2005.

  1. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .
    Short story - bought a 1989 C1500 for a parts truck. The emission sticker says 5.0, but the seller said that when he replaced the motor he put in a 5.7, so I figured "cool" and bought it because it was complete and running to make for an easy TBI motor swap.

    Got the motor out. It says 5.0 on the rear of the block, so I run the casting number:
    10243878 305 96-97 2 bolt Vortec truck, roller cam, one-piece rear seal

    Then the head number:
    1410218 1987-91 305 1.84"/1.5"

    So, for comparison, what was the factory hp/torque rating in 1989 for the 5.0 and 5.7 TBI motors? I searched the "inner web" and found 170hp for the 5.0 and 210hp for the 5.7. Does that sound right? And what was the torque rating? I think this pile of junk may be scrap yard bound... :mad:
     
  2. dodgedude99

    dodgedude99 1/2 ton status

    Joined:
    Jul 12, 2003
    Posts:
    784
    Likes Received:
    0
    Location:
    burbia of illinois
    i have an Ackerson catalog of 4x4s.
    he lists for 1989
    a 305 has 175 hp
    a 350 has 210 hp in the 1500 & 2500
    the 3500 350 has 190hp only for some reason.
     
  3. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .
    Does it list any torque ratings?
     
  4. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

    Joined:
    Aug 28, 2002
    Posts:
    9,097
    Likes Received:
    144
    Location:
    california
    I think the 350 lays down 300 ft lbs, not bad.
     
  5. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .

    That is fairly good. Anyone know about the 305 torque? Since that's the motor I'm stuck with.
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,180
    Likes Received:
    1,388
    Location:
    E-town baby!
    i think the 305 was 275 lb/ft...

    Rene
     
  7. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .
    [impure thoughts]

    Ok, finally found some info. I'm not sure if it's accurate, I found it on Google.

    305 = 170 hp and 255 torque
    350 = 190 hp and 300 torque

    Now it's decision time. Should I go Ford or Chevy? I have a complete running 1992 Thunderbird Sport with a 5.0 HO that has minor front end damage.

    302 = 205 hp and 275 torque


    The engine will go into my '79 K20 frame with an '89 C1500 body. If I use the 305 it is a direct swap and no wiring harness is needed because it will be hooked up to the cab from the donor vehicle (the motor and cab are both from the donor truck), and the speedometer and cruise will work just fine. But, the 700R4 needs rebuilt ($800) and the oil in the 305 smells like gas and it smokes a bit.

    Or, make new motor mounts and swap in the 5.0 HO from the Ford. The A/C and cruise probably won't work, and I don't know what it will take to make the speedometer work. It does have a good AOD transmission and the engine has 89,000 original miles and is in good condition. The 5.0 HO has more HP than the 350, and can easily be built to have more torque.

    Decisions, decisions... I'm thinking maybe the 5.0 HO :blush:

    [/impure thoughts]
     
  8. dodgedude99

    dodgedude99 1/2 ton status

    Joined:
    Jul 12, 2003
    Posts:
    784
    Likes Received:
    0
    Location:
    burbia of illinois
    my book lists

    305 175hp@4000rpm / 270 lb ft @ 2400rpm
    350 210hp@4000rpm / 300 lb ft @ 2400rpm
    and for sh!ts and giggles
    454 230hp@3600rpm / 385 lb ft @ 1600rpm
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
    Jul 23, 2000
    Posts:
    36,180
    Likes Received:
    1,388
    Location:
    E-town baby!
    No such thing...

    Rene
     
  10. CyberSniper

    CyberSniper 1/2 ton status Premium Member

    Joined:
    Apr 21, 2003
    Posts:
    2,257
    Likes Received:
    5
    Location:
    Chelsea, MI
    Well, TBI 305s usually made ~180hp/260ftlbs.

    You happen to have a roller 305 which frees up a little more power. It'd also let you run a little bit more faster ramp cam without having too much overlap. The worst part about 305s are the heads. If you were to clean them up you could easily make as much power as the injectors will allow.

    Keep in mind, with either a 305 or a 302 you'll need to spin the motor to get any appreciable amount of power out of it. The 302 suffers from a super short stroke (NOTHING for low end torque) and the 305 suffers from being aenemic.

    With the amount of money you'll have in the 302 you could buy a used set of 305 Vortec heads and a TBI to Vortec intake.
     
  11. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,568
    Likes Received:
    943
    Location:
    Massachussetts
    Noooo!!

    I'd say run the 305 as long as it will run!--dont waste time,effort,and cuss words putting ANY ford motor in a GM truck!--it will be hell to convert everything that wont fit..you'll have an abortion no one but you will want in the end(maybe even YOU wont care much for it when its done!)... :thinking:

    The 305 is not the scourge most chevy lovers make it out to be!..I've had several of them,as long as the cam has all its lobes,they run very well for the most part--and are not all that gutless when perked up with a 4 barrel carb and hi-rise intake(though EFI is far better for mileage and tourque!)...with todays fuel prices,a 305 is actually more sensible than a larger motor--unless you NEED a lot of HP or tourque,its a waste of money feeding a big block just to ride the the grocery store..

    If the newer 350's only put out 210 HP and 300ft lbs,thats not very much!--I've had 68-73 307 V8's that put out 200hp and 300 ft lbs with a 2 bbl carb!..and they would get 15-18 mpg too--no 350 I ever had would give more than 13 mpg or so unloaded...bigger is nice sometimes,but there is a lot to be said for economical transportation too..if you run the right gears,a 305 will propel a K5 or pickup adequately... :crazy:
     
  12. beater_k20

    beater_k20 Banned

    Joined:
    Dec 9, 2003
    Posts:
    10,276
    Likes Received:
    0
    Location:
    Elkhart, IN
    not true. a properly tuned 350 will give better milage than a 305. yes the 305 is smaller, but in order to move a load-the truck, the 350 makes more power. more power puts the engine under less strain and it can work more efficiently. it is actually possible for a 454 to out perform a 305 when it comes to fuel economy in the right situation.
     
  13. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,568
    Likes Received:
    943
    Location:
    Massachussetts
    Your right..to a point!

    Yes,I've owned 454 powered trucks that got slightly better mileage than the small blocks in there before the 454 came along--you are correct in stating the 454 CAN beat the smaller CID motors when they were pulling a heavy fullsize truck with high gears and big tires--the 454 will simply loaf along,while a 305 or 350 will be straining,and your right foot has to stay closer to the floor all the time compared to the 454...thus sucking down more fuel....

    But the key word here is "need"!--does he "need" a big block,or just "want" one??..thats all dependent on what uses the truck will see,among other things..

    The main point I was trying to make is the 305 is not such a "bad" motor like so many think..its not the "best" smallblock GM ever made,no argument there!--but to say they are "crappy" or "junk" just isn't true either!...its not the end of the world to find you have a 305...I'm quite happy with the one in my 79 C10--I just wish I'd put valve stem seals in first before I swapped it in--the "chevy puff" every time I start it scares off potential buyers..other than that,it gets decent fuel mileage and has more than adequate power for my needs... :crazy:
     
  14. beater_k20

    beater_k20 Banned

    Joined:
    Dec 9, 2003
    Posts:
    10,276
    Likes Received:
    0
    Location:
    Elkhart, IN
    the key term here is READING COMPREHENSION. he HAS a 305, and was TOLD it was a 350. he DOESNT HAVE a 454.

    actually, the 305 would make a great engine for a Toyota based rig. it carries the same bore to stroke ratio as a 383, and is roughly 3/4 of the size of the 383. 3/4 of the 383s power wouldnt be hard to make, and i dont see a huge issue with a Toyota weighing near what a FSC makes.
     
  15. CyberSniper

    CyberSniper 1/2 ton status Premium Member

    Joined:
    Apr 21, 2003
    Posts:
    2,257
    Likes Received:
    5
    Location:
    Chelsea, MI
    That's some funny sh¡t right there. You'll never make 3/4s of the horsepower of a 383 with a 305 without high dollar aftermarket heads or forced induction. The bore is too small and the heads flow too poorly to ever exceed 300hp with 10" of vacuum at idle... no matter how much you port the heads. Since stock fuel injection limits how wild of a cam you can run you'll never get that anyway. Not to mention a 305 weighs what a 383 does... that's a no brainer right there. A roller 4.3L V6 makes the same power as a TBI 305... and weighs 100lbs less.

    I tried, big power can't be done for cheap with a 3.736" bore (mine is .060" over). I ended up with 190hp@5600 at the rubber... and spent $725 to get there. I can beat my friends' Goodwrench 350 that supposedly makes 300hp in a drag race and he's got 4.10 gears as compared to my 3.42s. I wouldn't spend a penny more on a 305 for a truck. Maybe for a car... but anything over 3600lbs... not a chance.
     
  16. Thunder

    Thunder 3/4 ton status

    Joined:
    Jul 20, 2000
    Posts:
    8,946
    Likes Received:
    1
    Location:
    Northeast Nevada
    Its a Chevy keep it that way. Dont swap in a 5.0. 5.0s are great in a light car but not so good in a heavy truck. FORD AODs SUCK. They are far worse tranny than a 700R4. You will surely kill it putting it in a truck.
    You will also need a new fuel pump. TBI pump does not put out enough pressure to run Ford FI. Drive shaft mods. and other fabrication Motor/trans mounts ECT IMHO putting in a 5.0 it aint worth the time and trouble.
     
  17. k20

    k20 3/4 ton status

    Joined:
    Sep 9, 2001
    Posts:
    5,068
    Likes Received:
    0
    Location:
    Mineral Springs, NC

    BAH! HEATHEN!!!
     
  18. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .
    I guess I'll go with the 305 for now because it's a direct swap and I really want FI and an OD transmission.

    The truck is a 1979 K20 frame with a 1989 cab, divorced 205, 4.56 gears, and running 38" Ground Hawgs or 35" General MT's, depending on my mood. And it will be a daily driver/weekend mud play toy.

    First pic is how it was with the '79 body, second pic is how it is now with the '89 cab. I still need to find an 88-98 8 foot bed and lift the front about 3 more inches to match the shackle flip.

    [​IMG]

    [​IMG]
     
  19. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .


    :haha: :rotfl: HaHa, you got me there. I guess a better choice of words would have been "currently operational AOD", since we know it wouldn't last long.
     
  20. beater_k20

    beater_k20 Banned

    Joined:
    Dec 9, 2003
    Posts:
    10,276
    Likes Received:
    0
    Location:
    Elkhart, IN
    keep building for horsepower... then when you whine that your truck is a dog down low, i'll laugh at you becuase you dont have enough torque to move a fullsize truck.
    could that be because your wheel speeds are higher, since you're only turning your driveshaft 3.42 times per tire revolution as he is turning 4.10 times? nah, of course not! we all know wheel speed makes you go slower. :screwy:
     

Share This Page