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Strong running 307 SBC or Goodwrench crate 350 for 86 K3500 crew cab?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by k3500crewcab, Mar 20, 2002.

  1. k3500crewcab

    k3500crewcab Newbie

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    The 350 in my 86 K3500 crew cab ate a rod bearing and I need to get it back on the road quick. I have a good running 307 with Edelbrock performer carb/cam/manifold etc.. It runs pretty strong in my 77 K10. The other option is to get a crate 350 long block (supposed to have around 225hp) and use the old GM manifold and Q-jet instead. Will the 307 be strong enough for a ~6000# truck?

    Thanks!
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Temporarily, anything is better than nothing. Really depends on gearing, transmission, and load, but I'm betting you have numerically high gears (3.73 or 4.10's) and a 1:1 final drive transmission.

    I would venture a guess that it moves ok, but is not going to be as strong as a 350 by any means. (stock vs stock)

    I think the 307 option would be fine temporarily if you didn't plan on using the truck for towing or heavy hauling. If you plan on leaving the motor in there long enough to do some towing or hauling, get the 350.

    IMO
     
  3. Butch

    Butch 1/2 ton status

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    Put the biggest displacement you can afford in it. That 307 will work itself to death in a truck that big and get worse mileage.
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    350 for sure. 307 is only 3.25" stroke and a small bore to boot. Got to be one of the crappiest small blocks. Even a 305 is better IMO.
     
  5. 72THING

    72THING 1/2 ton status

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    What are you talking about? The 307 is the best small block ever! LOL. I ran one for a while because my dad had it lying around. It ran very smoothly, but didn't have any balls. Plus it had the smallest 2 BBL carb i've ever seen. I would go for the 350, unless your strapped for money, in which case you can run the 307 temporarily. My .02.
     
  6. k3500crewcab

    k3500crewcab Newbie

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    Thanks for the replies. I guess the problem I'm having is that my 307 with all the edelbrock performer parts runs really good in my K10. I know everyone says 307s suck. If I can't sell my K10 I think I'm just going to put it in and see how "bad" it really is.
     
  7. k5blazerus

    k5blazerus 1/2 ton status

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    I have a 307 in my 72 and it runs really strong. 0.40 over a larger stroke crank mild cam a intake and a holley carb red line on it is way better than my 350 in my daily driver.
    Colin
     
  8. bigmack

    bigmack 1/2 ton status

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    I would say put in the 307 and give it a try since you allready have it & know it's a good motor. In my opinion that is the only way to ever really know if it has enough power for what you need.
     

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