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Bore and Stroke list.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Twiz, Dec 27, 2001.

  1. Twiz

    Twiz 1/2 ton status

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    Bore and Stroke list /forums/images/graemlins/deal.gif

    Pontiac:
    350- 3.876 bore/3.75 stroke w/6.625 rods. 1.76 R/S Ratio.
    389- 4.060 bore/3.75 stroke w/6.625 rods. 1.76 R/S Ratio.
    400- 4.121 bore/3.75 stroke w/6.625 rods. 1.76 R/S Ratio.
    455- 4.152 bore/4.21 stroke w/6.625 rods. 1.57 R/S Ratio.

    Olds:
    350- 4.057 bore/3.385 stroke w/6.000 rods. 1.77 R/S Ratio.
    400- 4.000 bore/3.975 stroke w/?.??? rods. ?.?? R/S Ratio.
    400- 3.870 bore/4.250 stroke w/?.??? rods. ?.?? R/S Ratio.
    403- 4.351 bore/3.385 stroke w/?.??? rods. ?.?? R/S Ratio.
    455- 4.125 bore/4.250 stroke w/?.??? rods. ?.?? R/S Ratio.

    Caddie:
    472- 4.300 bore/4.060 stroke w/6.75 rods. 1.66 R/S Ratio.
    500- 4.300 bore/4.304 stroke w/6.75 rods. 1.56 R/S Ratio.

    Jeep:
    4.0L/242- 3.880 bore/3.41 stroke w/?.?? rods. ?.?? R/S Ratio. 8.7:1 comp.
    5.2L/318- 3.910 bore/3.31 stroke w/?.?? rods. ?.?? R/S Ratio. 8.9:1 comp
    5.9L/360- 4.000 bore/3.58 stroke w/?.?? rods. ?.?? R/S Ratio. 9.1:1 comp.

    Ford:
    302- 4.000 bore/3.000 stroke w/5.090 rods. 1.69 R/S Ratio.
    351W- 4.000 bore/3.500 stroke w/5.956 rods. 1.70 R/S Ratio.
    351C- 4.000 bore/3.500 stroke w/5.780 rods. 1.65 R/S Ratio.
    351M- 4.000 bore/3.500 stroke w/6.580 rods. 1.88 R/S Ratio.

    390- 4.050 bore/3.780 stroke w/?.??? rods. ?.?? R/S Ratio.
    400- 4.000 bore/4.000 stroke w/6.580 rods. 1.64 R/S Ratio.
    429- 4.360 bore/3.590 stroke w/6.605 rods. 1.83 R/S Ratio.
    460- 4.360 bore/3.850 stroke w/6.605 rods. 1.71 R/S Ratio.

    4.6L- 3.572 bore/3.543 stroke w/5.933 rods. 1.67 R/S Ratio.

    Chev:
    305- 3.740 bore/3.480 stroke w/5.70 rods. 1.63 R/S Ratio.
    327- 4.000 bore/3.250 stroke w/5.70 rods. 1.75 R/S Ratio.
    350- 4.000 bore/3.480 stroke w/5.70 rods. 1.63 R/S Ratio.
    *383- 4.030 bore/3.750 stroke w/5.70 rods. 1.52 R/S Ratio.*
    400- 4.125 bore/3.750 stroke w/5.565 rods. 1.48 R/S Ratio.

    396- 4.090 bore/3.760 stroke w/?.??? rods. ?.?? R/S Ratio.
    402- 4.126 bore/3.760 stroke w/?.??? rods. ?.?? R/S Ratio.
    427- 4.250 bore/3.760 stroke w/?.??? rods. ?.?? R/S Ratio.
    454- 4.250 bore/4.000 stroke w/6.135 rods. 1.53 R/S Ratio.
    502- 4.470 bore/4.000 stroke w/6.135 rods. 1.53 R/S Ratio.
    8.1L/496- 4.250 bore/4.370 stroke w/?.??? rods. ?.?? R/S Ratio. 9.10:1 comp.

    4.8L/293- 3.780 bore/3.268 stroke w/6.276 rods. 1.92 R/S Ratio. 9.45:1 comp.
    5.3L/325- 3.780 bore/3.622 stroke w/6.098 rods. 1.68 R/S Ratio. 9.45:1 comp.
    5.7L/346- 3.890 bore/3.622 stroke w/6.098 rods. 1.68 R/S Ratio. 10.5:1 comp. (LS6 vette engine)
    6.0L/364- 4.000 bore/3.622 stroke w/6.098 rods. 1.68 R/S Ratio. 9.40:1 comp.

    D. 6.6L/403- ?.?? bore/?.??? stroke w/?.??? rods. 17.5:1 comp. (300 psi cranking comp.)
    D. 6.5L/396- 4.060 bore/3.820 stroke w/?.??? rods. 20.2:1 com. (370 psi cranking comp.)

    Dodge:
    D. 5.9L- 4.020 bore/4.720 stroke w/?.??? rods (Cummins diesel)
     
  2. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    For those that would like to know why the above list is usefull.

    Basic engine dynamics at least in therory

    [*] Big Bore -with- Short Stroke
    Genneraly an engine with a large bore and short stroke would make power in the upper RPM ranges. This style of engine will want to rev, and would be better suited to light-weight, manual transmissions, sport-cars.
    Examples would be 327s 302s. That act much like dual-over head cammed small 4 cyls/6 cyls, as they are a bit weak off the line, but pull harder as engine R.P.M. increases.

    [*] Small Bore -with- Large Stroke.
    This style of engine will genneraly make alot of low-end torque, be a bit slow in climing the R.P.M. range, but will have no problem lugging down and pulling a load. A perfect engine suited for towing or pulling a heavy load. Acts much like a diesel.


    Rod to Stroke Ratio: Rod length divided by the Stroke length.
    R/S Ratio has several influences over engine dynamics, its effects have been debated for years. (so I won't go into details here)
    Genneraly,
    The higher the R/S Ratio is the higher/faster the engine will/can be turned. (much like the big-bore/short stroke engine)
    The lower the R/S Ratio is the engine will make more power in the lower RPM ranges. (much like the small bore/large stroke)
    Again, a subject of much debate.

    Ofcource, cam/heads/intake and such will have a impact on an engines power curve. Just another reason why selecting matching components is so improtant.



    Anyone who has anything to add/change, post it here and I'll edit it in.
     
  3. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: Bore/Stroke list. All

    How good are the newer Vortec powder metal rods? I have a set in my motor. Just wondering if I have pushed my luck twisting it to 7000. [​IMG]

    If ya can't stop.......Smile as you go under! [​IMG]
    PIC of mine from flblazers site<a target="_blank" href=http://www.flblazer.alloffroad.com/photo3.html>
    GO</a>
     
  4. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    The P/M rods used in the new gen Vortecs are differnt from the standared P/M rods (both are excelent, but 7000 grands ruff on parts, no matter how good) The G.M. performance parts are excelent rods for the money, probably hold up to 500 H/P.

    The vortecs use P.M. rods that are fractured on the big end. They cast the rods as one piece, machine it, then fracture the rod at a indicated point. When the rod ends are togather, you can't find the seam.

    <font color=blue>Wow factors
    A SBC at 6,000 RPMs:
    2- The piston travels from O to 60 MPH to 0 in just .005 of a sec. and in just 7 inches.
     
  5. michaelm

    michaelm 1/2 ton status

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    Re: Bore/Stroke list. All

    i think the 429/460 bore is 4.36 the 429 stroke is 3.59
    and the rod length listed is 351 Windsor only
    the 351C uses 5.78
    the 351 M and 400 use 6.58" rods
    the common 302 rods are 5.09" long
    the BOSS 302 shares rod length with the 221-289 at 5.155"

    sorry Ford nut here
    <P ID="edit"><FONT class="small">Edited by 77chev on 12/27/01 09:41 PM.</FONT></P>
     
  6. BorregoK5

    BorregoK5 1/2 ton status

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    Re: Bore/Stroke list. All

    Dont forget mine!

    415ci sbc
    Bore: 4.144" (0.030 over)
    Stroke : 3.832"
    Rod : 5.7"


    I started with nothing and I still have most of that left! - <a target="_blank" href=http://href=http://24.55.50.76:81/k5/> Pictures</a><P ID="edit"><FONT class="small">Edited by BorregoK5 on 12/27/01 10:43 PM.</FONT></P>
     
  7. m j

    m j 1/2 ton status

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    Re: Bore/Stroke list. All

    you didnt believe me on the rest or just short for time?
    I can list all the FE motors for ya too.
    at least fix the 302 one it looks bad if you cant get the most common motor correct

    formerly 77chev
     
  8. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    Included the info, Thanks m.j. (77chev, whats with the name change?)

    <font color=blue>Wow factors
    A SBC at 6,000 RPMs:
    2- The piston travels from O to 60 MPH to 0 in just .005 of a sec. and in just 7 inches.
     
  9. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    Sorry BorregoK5, trying to keep the custom engines to min. I included the 383 due to the popularity of it.

    Sounds like a killer combo tho'.

    Anyone else? I'd like to see numbers on the Dodge diesel or G.M. 6.2 diesel. Or anything else.

    Just think, Now you can amaze your friends and family with your new found knowledge!

    <font color=blue>Wow factors
    A SBC at 6,000 RPMs:
    2- The piston travels from O to 60 MPH to 0 in just .005 of a sec. and in just 7 inches.
     
  10. californiak5

    californiak5 1/2 ton status

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    Re: Bore/Stroke list. All

    <blockquote><font class="small">In reply to:</font><hr>

    at least fix the 302 one it looks bad if you cant get the most common motor correct

    <hr></blockquote>

    You just like being a Arrogant Bastard, don't you Michael? Not even 4 hours pass by since your last post, and you get upset that you weren't acknowledged right away. So you decide to be a a$$.

    I think everyone here knows that you have some decent knowledge and would be more than willing to respect that if you weren't such a D!@K. That's just opinion of course.

    See Ya,
    Keith

    <font color=green>Born to Drive My K5</font color=green>

    <a target="_blank" href=http://coloradok5.com/gallery/californiak5>CaliforniaK5's Pictures</a>
     
  11. m j

    m j 1/2 ton status

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    Re: Bore/Stroke list. All

    well he changed the 460 bore size with-in that 4 hrs.
    thanks for your concern though

    formerly 77chev
     
  12. californiak5

    californiak5 1/2 ton status

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    Re: Bore/Stroke list. All

    No problem. Any time.

    See Ya,
    Keith

    <font color=green>Born to Drive My K5</font color=green>

    <a target="_blank" href=http://coloradok5.com/gallery/californiak5>CaliforniaK5's Pictures</a>
     
  13. dyeager535

    dyeager535 1 ton status Premium Member

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    Re: Bore/Stroke list. All

    4.057 bore 3.385 stroke 6.00 rod (Gas and Diesel)

    Is actually correct for the Olds 350. Was going to post a whole bunch more Olds motors, but I can't believe someone else doesn't already have a list like this made up....



    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a>
    Why insist on counting when the ring gear has the tooth counts stamped in?
     
  14. m j

    m j 1/2 ton status

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    Re: Bore/Stroke list. All

    would be cool to list deck hieght as well.
    302=8.206
    351w= 9.48 early and 9.503 late
    351c=9.206
    351m&amp;400= a whoopin 10.29, even taller then a BBC
    429&amp;460=10.3
    you still have 429 incorrect the rods are same as 460, not same as 400.

    strange no pontiac guys have screamed for the 389 specs

    formerly 77chev
     
  15. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    Yeah, I bet there is a giant list out there somewhere, but not here (that I know of). So I thought it would be a good idea, qiuck/fast/accesible and printable. With strickly applicicable V-8 engines.
    Just makeing this list I learned alot, I'd never look twice at a "off-brand" engine umtil now. There are some really good combinations avalible.

    <font color=blue>Wow factors
    A SBC at 6,000 RPMs:
    2- The piston travels from O to 60 MPH to 0 in just .005 of a sec. and in just 7 inches.
     
  16. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    M.J.
    Rods lengths can be interpreted as a vague deck height, or atleast close enuff. Trying to keep it clean and unclutered.
    Thanks again, Mr. "edit"[​IMG]


    <font color=blue>Wow factors
    A SBC at 6,000 RPMs:
    2- The piston travels from O to 60 MPH to 0 in just .005 of a sec. and in just 7 inches.
     
  17. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: Bore/Stroke list. All

    Yeah 700 is a bit tight and I spend too much time up there. [​IMG] I have just seen it go to 7000 once and I think it was 7200 one other. (I was testing my shift lite. Set at 6000) I havent cleared the tach since the last one which was the 7200. Ill have to check tomorrow to make sure it was 7200. ( the tach has recall on it also)

    The P/M rods definatly looked strange when I opened the motor up. I didnt quite know what to think of them when I seen them at 1st. And yeah the split for the cap is near invisible. After I looked at them and checked them out pretty good (like a new toy) I figured they would prob be pretty good. Its just the whole Powder Metal name that threw me at 1st.

    If I ever wind it too tight and blow a rod Ill hit the recall on the tach and tell you what they will hold to! [​IMG]

    If ya can't stop.......Smile as you go under! [​IMG]
    PIC of mine from flblazers site<a target="_blank" href=http://www.flblazer.alloffroad.com/photo3.html>
    GO</a>
     
  18. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    Pureinsanity (SSteve)

    Check out my sig! [​IMG]
    Think about the G-forces involved with spinning a rod and piston, from a dead stop- to 60 MPH- to a dead stop. Then reversing the dirction. WOW!
    RPMs are ruff on parts!
    Not to get off track But, I had a buddy rip a rod in-half on a LS-6 big-block at 7 grand. It took out every-thing!. Basicly, the section of rod that was left, whiped around and took out every thing else, the pan (looked like a bomb went-off inside), the cam and both heads. He (more-or-less) had to remove the radiator cap and install a hole new engine under it.
    I didn't see it first hand, but I saw the after-math. There was a group of us, while the guy was pulling it apat. He was removeing un-identifiable pieces of metal out from the engine, we'd (the crowd) would go "ohh-ouch" in unicent. (kinda-had-to be there, I guess)
    Any-way, I like the P.M. rods, but 7-grand to much, so is 500 H/P (my first replie). As far as I would know.

    <font color=blue>Wow factors
    A SBC at 6,000 RPMs:
    2- The piston travels from O to 60 MPH to 0 in just .005 of a sec. and in just 7 inches
     
  19. Twiz

    Twiz 1/2 ton status

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    Re: Bore/Stroke list. All

    Thanks to all who have contributed to "The list"

    <font color=blue>Wow factors
    A SBC at 6,000 RPMs:
    2- The piston travels from O to 60 MPH to 0 in just .005 of a sec. and in just 7 inches.
     
  20. Pure Insanity

    Pure Insanity 1/2 ton status

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    Re: Bore/Stroke list. All

    Oh I dont PLAN to scatter the motor! I know hi RPM is hard on them, your sig kinda makes that point clear. LOL!

    I went out last nite and checked my tach, I guess I had cleared it. Oh well. BUT I dont plan to do it again just to verify it tho. [​IMG]

    I seen the aftermath of a rod parting company w/ piston before. EEEWWWW! Its messy to say the least. LOL!

    If ya can't stop.......Smile as you go under! [​IMG]
    PIC of mine from flblazers site<a target="_blank" href=http://www.flblazer.alloffroad.com/photo3.html>
    GO</a>
     

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