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305 for towing

Discussion in 'The Garage' started by georgiared84, Mar 21, 2003.

  1. georgiared84

    georgiared84 1/2 ton status

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    I'm planning on rebuilding a 305 for one of my k5's. I plan on using it for towing a small camper( 16 ft) and my jonboat. Mostly street use and traveling. Anybody got some advice on cam, bore, heads for this (besides trading it for a 350). It will be in an 84 with a new 700r4 and 3.73 gears.
     
  2. b454rat

    b454rat 1/2 ton status Premium Member

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    Don't go crazy on compression, keep it around 9 to 1. .030" over bore to clean things up. Same with the cam, I had luck with comp cams, say a high energy 260 or so. For an intake, get an Edelbrock Performer, or equivilant, and a 600-650 carb with vacuum secondaries. There are aot of different head choices to go with, a good one would be the Vortec heads. Need a matching intake, and they are close to $200 I think.
     
  3. Z3PR

    Z3PR Banned

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    If you'll be rebuilding, I'd spend another $200.00 on a good used (rebuildable) 350. In my opinion, a 305 isn't worth rebuilding if you plan on towing anything. A 305 just can't produce torque worth a grunt. You'll be much happier in the end with a rebuilt 350.
     
  4. rebelk5frk

    rebelk5frk 1/2 ton status

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    shhh you...

    He should rebuild the 305!


    Especially since he's thinking of taking my old 305 off my hands.
     
  5. jhrody

    jhrody 1/2 ton status

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    I say why not, considering GM put 292's in some tow truck chassis in the past. My old K5 had a 250 straight-6 and had adequate torque for towing, so a 305 V8 should be fine.
     
  6. georgiared84

    georgiared84 1/2 ton status

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    Don't worry, I'm coming to get it. BTW do you still have the lift and the wheels? I'll be back on the 31st and would like to come up one afternoon that week if possible. Do you offer quantity discounts? I knew I'd get the 350 spiel.
     
  7. sled_dog

    sled_dog 1 ton status

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    sorry just wondering why you want to rebuild a 305? Yes I am giving you the 350 spiel, I mean you can buy a rebuildable 350 for the price of a set of heads for a 305. I just replaced my 305 with a completely rebuilt 350 and even though I am still wearing it in and haven't beaten on it yet its way way more power htan the 305 ever was.
     
  8. georgiared84

    georgiared84 1/2 ton status

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    Yeah, that's my thinking. I had a F*rd F250with an inline 6 300 cid. that could tow like crazy because it was set up for high torque. I just put a GM crate 350 in my other 84 and figured I'd just experiment with this one. WTH it's not going to pass emisions anyway. I know the blocks on the 350 and the 305 are alike, what about the crank? I'm planning on boring about 30 over and putting in a decent cam but wasn't sure about what heads. I still want it to run on 89 or less gas and not get mileage measured in gallons to the mile.
     
  9. rebelk5frk

    rebelk5frk 1/2 ton status

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    I'm sure we can work something out. I still have everything.
     
  10. georgiared84

    georgiared84 1/2 ton status

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    Something to do.
     
  11. georgiared84

    georgiared84 1/2 ton status

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    Is the lift the cherry picker in your pics?
     
  12. georgiared84

    georgiared84 1/2 ton status

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    BTW, under the same topic, anyone know a good quadrajet guy in GA? I can do rough tuning and slap one together, but I'd like to get a pro to rebuild one of my old ones for this doomed project.
     
  13. rebelk5frk

    rebelk5frk 1/2 ton status

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    Yeah the one lifting my beast while I installed the lift springs is the one I'm selling.
     
  14. georgiared84

    georgiared84 1/2 ton status

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    Good, the limb of the tree I have been using is starting to die.
     
  15. Z3PR

    Z3PR Banned

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    [ QUOTE ]
    shhh you...

    He should rebuild the 305!


    Especially since he's thinking of taking my old 305 off my hands.

    [/ QUOTE ] Sorry, didn't know a deal was in progress.
     
  16. Z3PR

    Z3PR Banned

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    [ QUOTE ]
    I say why not, considering GM put 292's in some tow truck chassis in the past. My old K5 had a 250 straight-6 and had adequate torque for towing, so a 305 V8 should be fine.

    [/ QUOTE ] Don't know why, but inline 6cyl motors seam to produce alot more torque then smaller V-8 motors for some reason. Or so it seams to me anyways.
     
  17. georgiared84

    georgiared84 1/2 ton status

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    That's OK, I'm not picking it up unawares. I've had both. I love the new 350 I've got in my other k5. Just thought I'd see what I could get out of a 305 this time. If I don't end up liking the engine when I've finished, I'll just find a heep driver going gm and sell it. Those nice little 1 1/2 ton vehicles do pretty well with the smaller small blocks.
     
  18. georgiared84

    georgiared84 1/2 ton status

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    Yeah they do! Must be the setup.
     
  19. georgiared84

    georgiared84 1/2 ton status

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    What was the stock cfm for the 305 in an 84 K5? With a quadrajet 4 barrel m4me?
     
  20. jhrody

    jhrody 1/2 ton status

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    [ QUOTE ]
    What was the stock cfm for the 305 in an 84 K5? With a quadrajet 4 barrel m4me?

    [/ QUOTE ]

    to my knowledge, all GM Quadrajets were of two sizes: 750 and 795 CFM.
     

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