Buying Advice For A Chevy 383 Rotating Assembly

Discussion in 'Rotating Assemblies' started by Thunderbolt, Nov 1, 2020.

  1. Thunderbolt

    Thunderbolt Well-Known Member

    Thinking about rebuilding our 327 engine this winter, well the short block only, its a -68 or maybe newer.
    It has sat like 20 years in the corner of the garage...
    The cost of making it a 383 will be the same as a 327 (331) i think?

    It had a loud dull knocking sound when it was replaced.
    I think main bearing noise?

    This will have to be shipped to Sweden, and i have a freight forwarder in Delawere i can use if i needed.
    My funds are limited, and extra costs like shipping and customs will add... where and what (brand/type) should i buy or avoid?

    The measurments i will take care of, so its mostly where i can get the best deal im looking for,
    maybe its so simple as Summit or Jegs?

    I will use my Weiand 177 blower on the engine, E85 fuel, but can change to pump gas if they stop selling E85 localy. I guess i can go with cast crank and i-beam rods, but maybe should have forged pistons?

    It will end up in our Impala SS -67.
  2. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    a cast steel crank would be acceptable something like this rotating assembly,link below
    be sure its a block that accepts the standard 350 main bearing crank size
    and yes it will need clearance work, remember the heads you select, the port flow rates and combustion chamber
    and valves size's will have a profound effect on the power the engine will produce and the tendency to run into detonation issues if your not running E85.
    a 1967 impallas a heavy car, Id suggest you ger some 3.73:1 rear gears and if its an auto transmission a 3000 rpm stall speed converter to make the combo work.
    read through these threads and sub links

    keeping the low-cost theme build
    set up with that supercharger and a decent cam like this 00980,28520.html?sku=91510260&msclkid=53ad7077c4511df1d8002fe88f5da2a7&utm_source=bing&utm_medium=cpc&utm_campaign=SMI - Shopping (CSE) (Bing)&utm_term=4577404348890847&utm_content=All Products (Feb28_2020)
    Last edited: Nov 2, 2020
  3. busterrm

    busterrm solid fixture here in the forum

    I agree with Grumpy, need to check the journals to make sure it is the medium journal(2.45 in). There are 3 sizes 2.3, 2.45, and 2.65. 327s had either 2.3 or 2.45. SBC 400 was only one to have the 2.65 journal. With a 177 blower boost isn’t going to be high, I think a good quality hypereutectic piston would serve! JMHO!
    Last edited: Nov 2, 2020
  4. Thunderbolt

    Thunderbolt Well-Known Member

  5. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

    what you save initially, in lower price ,
    will more than likely be made up in the cost of required machining and required balancing
    you tend to get what you pay for, quality machine work and precision measurement and careful inspection processes take time and that costs money.
    there is ALWAYS a compromise, made between quality and price
    I learned that long ago,
    “Quality is like buying oats. If you want nice, clean, fresh oats, you must pay a fair price.
    However, if you can be satisfied with oats that have already been through the horse ...
    that comes a little cheaper.”

    thats why I generally suggest SCAT rotating assemblies
    and having the required precision measuring tools, if you save $400 on the rotating assembly initially,
    but need to spend $250 to get it balanced and $250 to get it polished ETC, what have you gained,
    especially if its lower quality cast iron vs cast steel in a SCAT crank
    remember in most case you still need a flex plate/flywheel and damper and associated bolts/fasteners etc.

    related threads
    Last edited: Nov 29, 2020
  6. Thunderbolt

    Thunderbolt Well-Known Member

    Well, i also realized, while i was comparing prices, that i will need to buy a balanced assembly, so i passed on it.
  7. Loves302Chevy

    Loves302Chevy "One test is worth a thousand expert opinions."

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