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400 crank into 350

Discussion in '1992-Present Chevy & GMC models' started by Mreetz, Feb 28, 2002.

  1. Mreetz

    Mreetz 1/2 ton status

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    Does this create a 383? Any suggestions for building a new engine for my '84 is greatly appreciated. I have a 400 block that I've started buying parts for, slowly........

    thanks!!

    1984 K-5
    4" lift
    35x12.5 MTs
    buildin a 400 for it, any info greatly appreciated
     
  2. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    From what I hear you need a special crank that is ground down.. (where I dont know...) next summer I am going to make my 350 into a 383 stroker.. a buddy of mine just put a 383 stroker into his 78 vette @ roughly 475hp. He says the gas mileage sucks though.. like really bad.... so this will be a big concern for me......

    guess you need to ask yourself is this a daily driver or are you going to drive far? I plan on driving from NJ to virginia, NJ to upstate NY so I want ok highway mileage.... at least 10-12mpg.....
    my $.02
     
  3. 55Willy

    55Willy 3/4 ton status

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    a 400 crank in a 350 with a overbore of .030 will make it a 383. Your other option is putting the 350 crank into the 400 and making a 377, which is a high reving motor. With a truck you wanna make low RPM power, unless you do more mud and sand where you want mid to high, if you build a top end power motor it will be of no use when you're crawling rocks at a couple feet a second.LOL
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Sounds like your buddy has way more cam than what you'll need in a truck. That is probably the main culprit in his mileage woes. I've got a TPI 383 in my '75 K5 that gets about 13.5 MPG on the highway. That's with 4.10 gears, 35 inch BFG Muds and a Turbo 400, so no overdrive. /forums/images/icons/cool.gif
     

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