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331" destroker questions

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by scrapin74, Jan 25, 2002.

  1. scrapin74

    scrapin74 Registered Member

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    331\" destroker questions

    I have a complete 327 and a complete 350 sitting in the garage....now here is what I want. A motor that spins very high rpm...(above 7000 rpm) I know that going with a small stroke can help accomplish this. So I want to put the crank out of the 327 in the 350...it is a steel crank so I know its strong. Also I know that 327 and 350 have the same size rod and main journals, and same size bore and rod. My 327 has new pistons and good rods.
    My questions are
    1. what rods do I have to use?
    2. can I use my new 327 pistons?
    3. what extra machine work is needed for this combo?
    I know it takes alot of work to byild a good motor...BUT I really am only curious about this engine combo...and how it works...THANKS....
     
  2. Twiz

    Twiz 1/2 ton status

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    Re: 331\" destroker questions

    A 327 with a steel crank has a 2.00" (small) main journal dia.
    '68 and up, they came with cast cranks and the normal (large), 2.100 journal.
    All 350s have a 2.100 main jurnal dia.
    There might be a spacer bearing avalible, to addapt a small journal crank, over to a large journal block.

    Also, there might be a water-pump (short/long) and acc pully combo problems,.. other wise, I think every thing else is a clean-streight forward deal.

    Get some good rods and rod bolts.

    <font color=white>.</font color=white>Eric
    <font color=white>.</font color=white>Twizted
     
  3. pcorssmit

    pcorssmit 1/2 ton status

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    Re: 331\" destroker questions

    Why not leave the 327 crank in the 327 block? You'd end up with the same thing without the bearing problems.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  4. Twiz

    Twiz 1/2 ton status

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    Re: 331\" destroker questions

    Good point.
    I have heard tho', that early (pre-'68-ish) blocks have something "wrong" with them. I don't remember foresure, somthing like the metal used, or casting, webbing- something like that. . . .
    They recomend that the max-over-bore be held to .030 over, and nothing over that.

    Not a big deal, but something to keep in mind.


    <font color=white>.</font color=white>Eric
    <font color=white>.</font color=white>Twizted
     
  5. Triaged

    Triaged 1/2 ton status

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    Re: 331

    Or sell the 327 and build up the 350. The only reason to destroke a 350 is because the rules won't allow the larger motor.
    Try downloading See it Here
     
  6. Twiz

    Twiz 1/2 ton status

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    Re: 331

    Not necacarily. I know "nothing beats displacement" rule.
    But, I've driven some 327 combos that just felt good. No stats, no math, no "theroys", It just felt good. They really like to rev, and there is nothing wrong with that!

    The over-square deal, seems to hold some value. (327s 427s)

    <font color=white>.</font color=white>Eric
    <font color=white>.</font color=white>Twizted
     
  7. Greenblazer-AZ

    Greenblazer-AZ 1/2 ton status

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    Re: 331

    I don't see much good in having a high reving engine in an off-road vehicle unless it's for mud, sand, or for a "Pavement Pounder".

    If you knew the truth, you too would be against marijuana prohibition!
    Blue '74 K5 Blazer Topless W/ 35 BFG Muds (See profile for pics)
     
  8. Jeff427

    Jeff427 1/2 ton status

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    Re: 331\" destroker questions

    Ehh, I don't know where the "331" came from, but if you put a 327 crank in a 350 block, you have a 327, unless you have had it bored. 350 and 327 have the same cylider bore (4") so the only point to switching the crank would be if you have a 4 bolt main 350 block, otherwise there is no real advantage. And as was stated above, you would have to have a large journal 327 crank, unless you can find some kind of spacers that will allow the use of the small journal crank.

    <font color=purple>Jeff427</font color=purple>

    <a target="_blank" href=http://lyonsdesign.bizhosting.com>Lyons Design</a>
     
  9. Glock Girl

    Glock Girl Registered Member

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    Re: 331\" destroker questions

    If you wsant to make a real wind up engine..and you can find a 283 out there you could make a 302...

    Shelby
    88 K5
     
  10. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 331\" destroker questions

    I was told by a buddy of my Dads that his favorite drag racing combo was a 283 block with a 327 crank. He said the motor would rev and rev and rev. And since I have a 327 and a 283 sitting in my driveway I am going to try and build one this summer. I was figuring it out on my engine dyno program, and my motor will spec out to 316 CID.

    My Chevy isn't broken, its just out of gas.
     
  11. K5Jimmy

    K5Jimmy 1/2 ton status

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    Re: 331\" destroker questions

    Tellin' my age here, but in HS, the hot setup was a 301 with an 098 solid cam, AFB or Grand National, and Hedman's......most often with a 3spd floor shift conversion, although there were TONS of Powerslides around (th350 wasn't invented yet).......THE bad 55 in town had a 4spd 301 w/ 2 4bbl (factory manifold!!), and could carry the front wheels across an intersection from a stop light dig........I really miss those days of no electronics and Cherry Bombs.......JD

    Stuck?...Hell no..I still got some gas left..
     
  12. m j

    m j 1/2 ton status

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    Re: 331\" destroker questions

    a stock 350 with some valvetrain and a cam will easily survive 7800 rpm blasts. destroking is foolish
    rpm = expensive valvetrain
    the bottom end is good for tons of RRRs, ask twisted to do the piston accel numbers for you he likes that stuff by his recent sig lines

    formerly 77chev
    still a jerk though
     
  13. Glock Girl

    Glock Girl Registered Member

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    Re: 331\" destroker questions

    Hoss I may be wrong but your combinaton 283 block (3.875 bore)x 327 crank (3.25) makes it a 305.83. This is commonly refered to as the 307 stroker. Not to be confused with a GM 307 dog. You did not say anything about boring your block but that is alot of meat to take out of a 283 to get in the 316 range

    Shelby
    88 K5
     
  14. Glock Girl

    Glock Girl Registered Member

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    Re: 331\" destroker questions

    Jeff...331 can be achieved easily by boring 30 over (4.03 x 3.25) that would give you 331.64

    Shelby
    88 K5
     
  15. Glock Girl

    Glock Girl Registered Member

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    Re: 331\" destroker questions

    Scrapin
    Since the 327 and 350 both used 5.7 rods use those.
    327 and 350 are the same bore and you are keeping the 327 crank your 327 pistons will be fine
    depending on what year crank you have ( I believe 68 was the big journal year)you will need spacers to get everythign to the right bore

    Shelby
    88 K5
     
  16. Hossbaby50

    Hossbaby50 3/4 ton status

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    Re: 331\" destroker questions

    The 283 I have is bored .060 over. I will probably have to get the block sleeved when it is machined, but thats no big deal. The set of pistons that came with the block are .060 over aluminums. It should make a good combo, 283(.060) and the 327 crank. At least I hope it will.

    My Chevy isn't broken, its just out of gas.
     

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