Olds 307 lump?
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Thread: Olds 307 lump?

  1. #1
    Rust Obsessive J1MMY's Avatar
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    Olds 307 lump?

    Seems like these aren't particularly popular stateside, but has anyone lived with one long term - are they really so gutless or are they adequate in standard form for cruising? Got my eye on an 80's Chevy with one in.

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    Official RnS Addict TheOldShedSquad's Avatar
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    I know they aren't popular, but they were one of the real 'smog motors' in the late Seventies and early Eighties. They turned up in lots of cars not associated with performance - Cadillac Sevilles, Caprices and all that. If you're after a bog-standard motor for pulling around a Yank then they're no better or worse than any other lazy smog motor. I had a late-70s Cutlass with the 350 Olds motor and it was as lazy as you like. Even the 403 motors in Trans Ams were pretty lazy. Just don't expect to run 10s.
    If you're after a motor to tune up and make loadsa BHP then you'd probably be better off with a small-block Chevy or something. There are loads of bolt-on performance goodies for Chevys but not much at all for Olds motors, and what there is costs a lot more than Chevy stuff. You could tune up the 307 - it uses the same engineering as any other internal combustion motor - but you'd get a real head-start by using something more common like a SBC.
    I remember years ago, one of the Stateside magazines showing how you could build a 440ci Olds small-block using the diesel 350 block and the steel crank from a 330 and this and that and the other. Looked hot! And there's a guy in the West Mids called Adrian (sorry, can't remember surname) who knew a thing or two about tweaking up Olds motors - he had one in a Cobra replica and it looked the business.

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    Rust Obsessive J1MMY's Avatar
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    I wouldn't want to tune it, more curious to know if I will be caning through fuel just to get anywhere.

    Thanks for the info though :-)

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    Official RnS Addict TheOldShedSquad's Avatar
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    Didn't the Olds equivalent of the Monte Carlo SS have the 307 in?
    Anyway, in theory it should be as economical as you could expect from a 5-litre smog V8. If the car you're looking at comes with a 4-speed overdrive auto like a 200r4 or 700r4 then it should be a 20+mpg car

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    Olds 307s with a decent set of heads can make good power, the heads are the week link, i have seen builds in the 400bhp mark with these engines, however a chevy is cheaper as the parts are off the shelf

    best under rated engine for street power 403 olds, large bore and small ish stroke. You just have to over come the week areas in any build. It was me with the cobra, i am now building a 383 stroker olds, for a 34 ford, and should pull 550ish bhp.
    race engines.

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    Rust Obsessive J1MMY's Avatar
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    550bhp? Wow, what is the build sheet like on that!

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    Jimmy build sheet for engine

    Block bored to 4.125, carrillo honda chevy rods h beam plateau honed
    steel crank offset ground 3.6inch,
    girdle to all mains.
    cp special pistons, and ring pack
    mechanical roller custom ground cam
    eelbrock alloy heads ported and polished, (that was expensive)
    custom valves and larger than the edelbrock offerings.
    Victor manifold, and a few custom mods.

    carb and efi option, i convert my own manifolds to efi in house.

    I must have my engines produce good vacumn, and be street freindly, i hate engines coughing and spitting at the lights , or until they reach 3000rpm, not very practical as a stret rod.
    race engines.

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