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.

What Should i do to improve the chevy 305????

Discussion in 'The Garage' started by Capnscoop, Mar 25, 2007.

  1. Capnscoop

    Capnscoop Registered Member

    Joined:
    Mar 25, 2007
    Posts:
    43
    Likes Received:
    0
    Location:
    South Florida
    what should i do to improve my stock 305(1986)??? any suggestions im not looking to break the bank......thanks...also were should i buy new rubber seals for my doors windows cab ect???
     
  2. 4xcrazy

    4xcrazy 3/4 ton status

    Joined:
    Oct 31, 2003
    Posts:
    9,471
    Likes Received:
    5
    Location:
    Olympia/Lacey, Washington
    drop it in a 1500 lb car, it'll drive NICE and fast then,,,,
     
  3. Chevy305

    Chevy305 6 Lug 14bsf Status Premium Member GMOTM Winner

    Joined:
    Jan 23, 2006
    Posts:
    11,230
    Likes Received:
    488
    Location:
    New Hampshire
    Intake, carb and exhaust...

    Also see Classic Parts of America for your window seals
     
  4. Blue90

    Blue90 1/2 ton status

    Joined:
    Aug 27, 2004
    Posts:
    583
    Likes Received:
    2
    You could try a throttle body spacer, aftermarket exhaust, k&n air filter. Or just take that 305 out and throw in a 350:wink1:. that'll get the job done for sure.
    Try here for those seals http://www.lmctruck.com/
     
  5. Pvt. Maggot

    Pvt. Maggot 1/2 ton status

    Joined:
    Sep 27, 2005
    Posts:
    559
    Likes Received:
    0
    Location:
    Brownsville PA
    Just do basic's, intake, carb, exhaust, anything that can be bolted onto a 350, although people will tell you that the 305 isn't a good motor, they run very well, and with money can be made beastly, but a 350 is always a better motor in the end, with the mods you do to the 305, you can bolt them onto the 350 later on. Have fun.
     
  6. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .
    Add 45 cubic inches.
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,062
    Likes Received:
    69
    Location:
    Pleasanton, CA.
    Attach a chain to it. All a 305 is good for is a boat anchor. :D

    Seriously, it would be cheaper to install a new 350 crate engine than try to improve power in a 305 without breaking the bank.
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    Make sure it's in good tune. Plugs, wires, vacuum lines, etc.

    Nothing really wrong with a 305, except the size and inherent design issues. Without tons of money, it's pretty hard to "wake up" in a truck, the engine is too small for this large of a vehicle.

    Biggest bang for the buck IMO for a 305 equipped truck is gearing. If yours are 3.08's (common and likely) then swapping to a numerically higher ratio will make all the difference in the world.
     
  9. 80' 427

    80' 427 1/2 ton status Premium Member

    Joined:
    Nov 14, 2006
    Posts:
    4,089
    Likes Received:
    399
    Location:
    NEBRASKA
    Going from 3.08s to 4.11s made my 305 a rocket ship in comparison.
     
  10. 71 Blazer

    71 Blazer 1/2 ton status

    Joined:
    Jul 16, 2005
    Posts:
    184
    Likes Received:
    0
    Location:
    windsor virginia
    x2 add 45 cubic inches.
     
  11. shockline

    shockline Registered Member

    Joined:
    May 10, 2006
    Posts:
    51
    Likes Received:
    0
    Location:
    Powhatan Virginia
    I had a 305 in my 84 K5, and it was nice for DD, but for towing or anything fun it was not fun. I switched mine out for a 383, it should be done by Easter.
     
  12. vortec

    vortec 1/2 ton status

    Joined:
    Jul 22, 2004
    Posts:
    1,472
    Likes Received:
    0
    Location:
    fort worth, texas
    x2. always thing ahead to the day when you add more cubes. 305 isn't a terrible engine, just not the best choice from gm.
     
  13. 85mudbogger

    85mudbogger 1/2 ton status

    Joined:
    Feb 5, 2007
    Posts:
    226
    Likes Received:
    0
    Location:
    missouri
    cam swap, cs1062r at www.northernautoparts.com it will wake that 305 up, also a performer rpm intake,or just a performer, and some headers, also if you could take the heads off and do a diy exhaust valve cleanup, that would be the best mod ever to a 305, im runnin 305 heads on my 327, they lack the top end from the get go put a little porting in them and its a good effiecient head, the exhaust port is the killer, the 305 took my 83 camaro into the 7.9s range in the 1/8th mile which is way fast for a 305
     
  14. big dan

    big dan 1/2 ton status Premium Member

    Joined:
    Aug 1, 2005
    Posts:
    2,656
    Likes Received:
    29
    Location:
    Arkansas
    though the 305 is not my choice of engines, I have nothing bad to say about them. hell right now I would love to have one. Ive got 3 trucks and none of them have a motor.:( Id use a 250 inline six if I could find one in good shape.

    as far as 305s go, there is a guy I work with that has an 81 with 35s and stock 3.08s. he built a 305 with a big cam, ported heads, headers and an aluminum intake that will smoke the tires without power braking it.

    the only real problems I see with them is like was said, they lack the cubes to make a lot of power and I was looking at rebuild kits, since Im gonna have to rebuild my motor, I can get a kit with everything I need to do a basic re-ring and replace bearings in a 350 for $120. the cheapest one for a 305 was about $250.:eek1:
     
  15. gibby2268

    gibby2268 1/2 ton status

    Joined:
    Jun 6, 2006
    Posts:
    553
    Likes Received:
    0
    Location:
    Middle TN
    My solution: Drive a 99 Nissan Frontier with a four banger and auto tranny around for a while, then the 305 will feel like a big block, baby!:D :woot:
     

Share This Page