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Question for FARTMAN

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by not4show, Jul 20, 2001.

  1. not4show

    not4show 1/2 ton status

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    Since reference numbers and identifying engines is your forte, maybe you can anwser this. (Or somebody can) How do you tell the difference between a Chevy 307cid and a 327cid engine? Thanks

    Never put a stupid move passed a stupid person.
     
  2. Andreas

    Andreas 1/2 ton status

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    From the outside I think nothing separates them apart. You´ll have to look up the castingnumber and check with mortec. The 307 is a 327 crank stuffed in a 283 block, so to speak. 3.25" stroke and 3.875" bore. It´s large journal, so if you can get a 307 cheap (which often is the case because no one wants them) the crank is worth a lot to some people. The 327 has the same (3.25") stroke but with a 4" bore, like the 350.

    /Andreas

    406cui of pure sh*t[​IMG]
     
  3. FARTMAN

    FARTMAN 1/2 ton status

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    YES what he said is right check the # but a 307 crank will fit a 327 large journal but it is counter weighted diffrent and would require precission balancing often requiring EXPENSIVE mallory metal to be added to make it balance out. each piece of that metal cost $50.00 each. the crank is balanced to bob weights that is equal to half of the weight of crank,rod,piston,rings,rod bearing so if you have a bigger piston such as the 327 the bob weight is off quite a bit. BEANS SUCH A GOOD MEAL ALSO A LOWFAT FOOD!!!!!!!! P.S the 307 block is only usable for a 307 application since it is a large jounal with the small bore A GREAT BOAT ANCHOR if ya needs one!
     
  4. 88streetblaze

    88streetblaze 1/2 ton status

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    oopps made an ass of myself..
     
  5. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I think what Anreas was saying was you can take parts out of the other motors to make another size.

    For instance: a 454 block and a 396 crank gives you a 427. So, what Andreas was saying is to take one part and another and you will possibly have the 327. I have no clues about small blocks because I'm all big block!!! [​IMG]

    BTW, if you took a 396 block and a 454 crank, that will give you a 435 cubic inch. [​IMG]

    Anybody planning on checking out my homepage, forget it, I am still working on it!!!
     
  6. Emmettology 101

    Emmettology 101 3/4 ton status

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    Ya, but if you combine a potato with a penis you get a Dic-tater! LOL

    Ok on a more serious note.. What if you combined a 283 block with a 400 crank? would that equal a high revvin Small Block? It would be sweet ot have a sbc that could rev to 10-12K rpm!!!! Not for the Blazer, for a street/strip car.... I like the 302's in the Camaros, just wonderin what the 283/400 combo would make..

    "I see, said the Blind Man to the Deaf Mute who was walking a dog with no legs!"

    <a target="_blank" href=http://www.geocities.com/emmettology101>www.geocities.com/emmettology101</a>
     
  7. michaelm

    michaelm 1/2 ton status

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    a 400 crank and 283 block wouldnt be a revver. long stroke + small bore = not revver

    a 302 is a 327 block(thought they were special block but to keep in the theme of the discussion will refer to it as 327/350) with a 3" crank not a 283 block.

    you guys all asleep today or what????
     
  8. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    K30Guy,

    Are you sure about that 396/454-crank thing? I'm no expert, but I did spend some time trying to figure out how my own motor went together and learned a few things:

    My block is a 396 (originally a 4.096" Bore) with a 454 crank (4.00" Stroke)....that calculates out to 421.66 cu in with no overbore. Mine is .030" over, so the math of (4.126" x 4.00") works out to 427.86 cu in.

    The only way I can see getting close to 435 cu in, is by overboring .060" on the 396 block...then you'd be at (4.156" x 4.00") or 434.10 cu in.

    Am I right, or do I still have more to learn on this? I am not sure how to calculate the effect of the cylinder head volumes....so these are just straight bore-and-stroke displacement calculations. [​IMG]

    -Greg72
     
  9. Emmettology 101

    Emmettology 101 3/4 ton status

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    Ok, so I had it backwards. So a 400 block with a 283 crank.. :)

    "It's like a sore dick deal, You cant beat it!"

    <a target="_blank" href=http://www.geocities.com/emmettology101>www.geocities.com/emmettology101</a>
     
  10. 88streetblaze

    88streetblaze 1/2 ton status

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    would a 283 crank fit a 400? and what do they use to make a 400 a 377
     
  11. Emmettology 101

    Emmettology 101 3/4 ton status

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    Not sure if the 283 crank would in the 400 beut it would be cool to try! :)

    I believe the 377 is made up of a 400 block and a 350 crank.

    "It's like a sore dick deal, You cant beat it!"

    <a target="_blank" href=http://www.geocities.com/emmettology101>www.geocities.com/emmettology101</a>
     
  12. 88streetblaze

    88streetblaze 1/2 ton status

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    that's what i was thinking..now i have seen a few of them turn out to be high turning motors that where used in burn out comps...
     
  13. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I forgot to mention the bores. I was simply stating what you would get if you took these parts out of each and what you would come up with.

    As for the specific bore sizes when mated to the strokes, I would need to check out my books and do some calculations. I do know that what I said above WILL get you those sizes of motors. I just didnt get into details on HOW get that specific size.

    I do know there is some boring involved with making certain size motors too. You may be correct on all counts here, but I would need to get some books and calculate everything, as I said before. [​IMG]

    Anybody planning on checking out my homepage, forget it, I am still working on it!!!
     
  14. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    To make a 377 you take a 400 block and put in a 350 crank. That makes a high revver.

    JH

    '83 GMC Jimmy 4x4 ZZ4 Crate Motor
    '83 Chevy K20 Sand Drag Racer, 578 RWHP
    '94 Impala SS
    '01 Chevy 2500HD 4x4 w/8.1L & Allison Auto
     
  15. Andreas

    Andreas 1/2 ton status

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    The 400 has .20" larger mains than all other smallblocks, so if you wanna put somthing else than a 400 crank in there you have to use spacers or thicker bearings. Spacers are the cheap alternative and safe up to 5-6K rpms. If you destroke a .030 bored 400 with a 327 (3.25") crank you´ll get a Nascar style 352. Bore it further to .060 and you´ll get 358cui. Not recommended on standard blocks. .030 is the safe limit on 400 blocks, even though there are ppl running .060 with no problems. Cool with a 412 cui smallblock[​IMG] Even 4" cranks exists for 434cui smallblocks!! Anyways, back to destroking. If you destroke a 400 even further with a 283 (3") crank you´ll get a weird 321[​IMG], that in combination with long rods and matching valvetrain probably would like 8-10K all day and night[​IMG] I´m all smallblocks. Love ´em ! Oh, btw. The formula for calculating displacement is 6.283 x stroke x bore x bore.

    /Andreas

    406cui of pure sh*t[​IMG]<P ID="edit"><FONT class="small">Edited by Andreas on 07/21/01 03:17 AM.</FONT></P>
     
  16. 84_Chevy_K10

    84_Chevy_K10 Banned

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    For reference, a 327 is not a 302 block, it's a 350 block with a 3.25" stroke crank in it.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  17. WOODYJ

    WOODYJ 1/2 ton status

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    A 283 crank will not fit a 400 block. The 400 block, I believe has larger main journals than the 283. That would be a fun motor though!!

    k5woody I Don't Understand The Jeep Thing Either!!!
     

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