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305/350 cranks and heads

Discussion in '40- & 55-Series Tech' started by madoc1, Aug 14, 2006.

  1. madoc1

    madoc1

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    i have a pair of 305 cranks and a 350 block. i always thought that a 305 crank would fit but not work due to the balance weight diff. today i was talking with a local hot rod shop and he says a 305 will work if the #is 442. anyone heard of this?

    also 305 heads will work but jumps compression way up?

    any knowledge will help thx jim
     
  2. pbgbottle

    pbgbottle Forum Lifer

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    442 is the last digits of the crank # i looked in my book and that was the only crank # for the 305 /350 crank that the book showed

    1969-85 3932442 305,350
     
  3. madoc1

    madoc1

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    bottle- that sounds great info. need to tear out the cranks tomorrow. wow , just love this forum!

    thx, jim
     
  4. madoc1

    madoc1

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    any idea on the heads? jim
     
  5. Gumby

    Gumby Supamod Staff Member s-Moderator

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    They bolt up, but I have also heard they bump up the compression. I have a set on a 350 in my T100, but it has yet to fire so I don't have any real answer.

    The hot setup is 5.7 Vortec heads on a 350. You need a special manifold, but they flow way better than either 350 or 305 heads. they go for about $100 a shot around here.
     
  6. pbgbottle

    pbgbottle Forum Lifer

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    depends on the casting also of the 305 heads they may be what some call the light weight casting . less material in them prone to warping and cracking .also have smaller runners .( don't flow well ) the only gain from the 305 heads would be compression . i too would go for the vortec heads . straight out of the box they will outflow any older cast performance head . (camelhumps etc.) the vortec even out perform some of the aftermarket aluminum heads . so i've read . .
     
  7. pbgbottle

    pbgbottle Forum Lifer

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    pic of light weight head can see metal removed from between the head bolts ,on a heavy cast head the edge of the head would be straight not scalloped
    also has larger water jacket holes .
    auto_chevy305_3 (Small).jpg
     
  8. pbgbottle

    pbgbottle Forum Lifer

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    heres a pic of a heavy casting head more metal in the casting
    head (Medium).JPG
     
  9. madoc1

    madoc1

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    305 heads

    gumby, et al. i wish i could do a hot set up. but this is a old man budget deal. i guess i will just do it and if i mess up at least the parts are easy to get to. thx all. (if anyone has done this before-350 block,305 crank,305 heads ) might want to let me know.

    jim:) :D :beer: :beer:
     
  10. pbgbottle

    pbgbottle Forum Lifer

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    another consideration .is the piston .are you gonna get a dished piston . or use a flatop .and run high compresion .then you usually will have to run a bigger cam . to get it to run .and then lose a almost all your bottom end torque just a thought
    .most desriable 305 head is casting # 462624 also has a 58cc chamber , another thing is the 305 head chambers are slightly father apart 21/32 and on the 350 they are only 15/32-inch apart . may be a head gasket issue ? . i did a budget build on my 350 and just traded my 305 and 307 heads to a head rebuilder for a decent set of 350 heads . all rebuilt polished and ported straight up . i wanted my engine to breath .
     
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