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383 Questions??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BigBadBowTie, May 24, 2000.

  1. BigBadBowTie

    BigBadBowTie 1/2 ton status

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    Well it's finally time to get my 383. I've still got to decide between 3 machine shops to build it. One of them asked me if I wanted to use 400 rods or 350 rods with special Kieth Black pistons that had a higher mounting pin. Does anyone know what the differance would be on the motor? Also it's been recommended to go with an Edelbrock Performer manifold & a 650 Q-Jet. Also any performance diff between 195 valve heads and 202? LEt me kow of anything else you can thin of....Thanks

    Rick
    86 K-5
    http://www.coloradok5.com/RMcPherson.htm
     
  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    For the rods. If you use 400 rods, the rod will be longer and you will have less piston mass. If you use 350 Rods, the rod will shorter and you will have more of a piston mass.
    I would go with the 400 rods.

    As for the heads. I have been told that the extra volun=me of the 202 head doesn't come into play until the higher rpm's (around 6500)... I have also heard that a smaller valve will give you more low end torque.

    Hope this helps!

    Mike
    82 GMC Jimmy "Emmett"
    IN TOO DEEP Off-Road Club
     
  3. ken

    ken 1/2 ton status

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    You're backwards on the rods. 400 rods are shorter and therefore exert more side loading on the cylinder walls, although they provide slightly more torque than 350 rods. If you plan to rev alot, I'd go with the 350 rods. As for heads, the 1.94s are more than adequate...and the 2.02s will give you a soggier bottom end.

    ken
     
  4. Burt4x4

    Burt4x4 3/4 ton status

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    If I had the $$ I would go with the GM crate HT383 part#12497317 found it on thier web site.
    I know this doesn't answer your question but mabie you could compare the componets (rods & pistons) that the crate is using and use that as a guide!!??[​IMG]
    best of luck

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
     
  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    Sorry for that mistake. I knew it was one way or the other and I got them mixed up. But thanks for correcting me!

    Mike :)
    Again, sorry about the misinformation.

    Mike
    82 GMC Jimmy "Emmett"
    IN TOO DEEP Off-Road Club
     
  6. BigBadBowTie

    BigBadBowTie 1/2 ton status

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    Okay, should I go smaller than 194 valves? I want 9:1 compression, and ALOT of torque. This motor will run it's daily grind never going above 3500rpm, occasiannaly we'll wind her up to 5500rpm, but not often, so want some power to move them 35"s

    Rick
    86 K-5
    http://www.coloradok5.com/RMcPherson.htm
     
  7. BigBadBowTie

    BigBadBowTie 1/2 ton status

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    That motor sure is pretty, didn't even know they made a 383 at GM. I havn't located a price yet, let me know if you do. Would love to buy it, but mines getting built for aroun $2000, can imagine GM's is over $3000! But Vortec heads, hmmmmm, maybe!

    Rick
    86 K-5
    http://www.coloradok5.com/RMcPherson.htm
     
  8. BigBadBowTie

    BigBadBowTie 1/2 ton status

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  9. Andreas

    Andreas 1/2 ton status

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    With the stock 400 rods (5.565") you´re safe up to around 4500-5000 rpm, with the 350 rods (5.700") you can add 1000 rpm to the "safe" limit. The engine needs re-balancing if you choose a rod different than stock. I think you should go with the bigger valves, breathing is a good thing [​IMG] but, as you might have guessed, it will suck a bit more fuel. Not a lot though. How well it´ll idle is more up to the cam, not the valves. Hook it up with a comp cam 260 or maybe one of the new Xtreme cams, made especially for 4WD vehicle. And......AAARGH....I CAN`T HELP IT......PUT A BLOWER ON IT !![​IMG][​IMG]

    Andreas

    406cui of pure sh*t[​IMG]
     
  10. Burt4x4

    Burt4x4 3/4 ton status

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    Ya I just called http://www.paceparts.com/ and they said it's new and they should be avalable soon at around 2800 smakers. He was guessing from what he had heard so i'm sure it could be more or less!!??
    Sweet thou isn't it![​IMG]
    I don't know much about the Vortec heads except only certin headers and intake manafolds will work with them so keep that in mind!
    Good luck

    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
     
  11. Blazer79

    Blazer79 1/2 ton status

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    You may wanna check http://www.sdpc2000.com/ for the vortecs, crate engines and other parts.

    <font color=black>//////
    What the heck!...Drive it like gas is $0.50/gal!!!
    </font color=black>[​IMG]
     
  12. Blazer1970

    Blazer1970 1/2 ton status

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    You can buy the Vortec heads new for about $400 a set, complete with valves. Any small block exhaust manifolds or headers will work with them. The intake manifolds are different. If you are paying for head work on your existing heads, and buying a new intake anyway, they are a very cost effective alternative. They have 64cc combustion chambers, which will give you about 9 - 9.5:1 compression with a stock bottom end (dished pistons) on a 350, a little higher on a 383.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  13. Burt4x4

    Burt4x4 3/4 ton status

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    Ahh thanks for the correction Blazer1970 my bad on the header deal!![​IMG]
    Do you know if the same mounting holes are there for altinators and other brackets use by our rigs?


    Rock ON![​IMG] 72 K5 [​IMG] Led Zeppelin
     

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