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How big of a difference will it be

Discussion in 'Other Rides' started by Z3PR, Mar 14, 2005.

  1. Z3PR

    Z3PR Banned

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    Okay, most of y'all know I have a 78 El Camino with a factory original 305. When I can afford it I plan on a 350cid 290hp GM crate engine. How big of a difference will that be ?? I have no idea what the factory HP and torque rateing is for the factory 78 305. I also have no idea what the factory rear end gearing is, but I also plan on a posi rear with 3.73 gears, and a 700r4 transmission. I think that combo would be a great match. So anyone have any advice or comments ??
     
  2. sled_dog

    sled_dog 1 ton status

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    motor, gears, everything, I think you will be very happy with it. My 305 to 350 swap was a good jump in power in my K5. That was mostly torque gain though and with 2.73 rears it still sucked. With gears that would have been awesome. Will you see a HUGE jump, I don't think so, but all put together it should be a little rocket.
     
  3. sweetk30

    sweetk30 professional hooker Premium Member

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    those g bodys flex big time and need some extra stiffeners added to help body twist . my friend runs them and his 87 monte ss was big time flex off the line and we put in 6 point cage and wow big improvment. he also runs air shocks rear with at least 50-60 psi for traction help. this is all at the track 1/8 and 1/4 miles
     
  4. Z3PR

    Z3PR Banned

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  5. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    what size tires are you going to run? I plan on 3.55 with 275/60 tires with my 700R4 in my chevelle. just a thought.
     
  6. 3 on the tree

    3 on the tree 1/2 ton status

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    I'm guessing your 305 was rated at no morre than 180 horses. You will notice a vast improvement in acceleration, with probably the same mpg.
     
  7. Z3PR

    Z3PR Banned

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    I want too go with 16" rims because I plan on upgrading the breaks. I'm not sure on tire size. I do want the same size tire on all 4 corners. I'd like the widest tires that will fit without any rubbing. Front will be lowered 1.5" to 2", and rear will be lower 1".
     
  8. Z3PR

    Z3PR Banned

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    I'm getting phyced about that crate motor.
    After the warranty runs out, think a pair of Dart Pro-1 heads, and a Comp Cams 270-H magnum camshaft. What do you think that would bring it up to ??
     

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