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Technical 194 to 250

Discussion in 'The Hokey Ass Message Board' started by 36roadster, Nov 6, 2020.

  1. What needs to be done to a Chevy 194 to get it to 250 inches? Rebore & pistons? Rods? Any other modifications required? If I go down this road, any U.S. sellers that specialize in these engines?
  2. Budget36
    Joined: Nov 29, 2014
    Posts: 7,497


    Out on a limb here, but guessing if possible longer stroke crankshaft, etc. I don’t believe just an over bore will get you there;)

    Maybe search on bore x stroke specs for each
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 50,186


    you're not going to be able to bore that block 5/16" bigger....

    If you want the big engine, start with the big engine. sorry. I know they're probably hard to find down there.
  4. lake_harley
    Joined: Jun 4, 2017
    Posts: 1,558


    Sissell Automotive


  5. Elcohaulic
    Joined: Dec 27, 2017
    Posts: 2,587


    Squirrel is right on the mark.. Pick up a nice 454, get one with low compression from the 70s clean it up, change the timing chain, check the cam, rings and cyls..
  6. Finding a 250 here is like finding a '44 Henway head gasket....
    kidcampbell71 likes this.
  7. patsurf
    Joined: Jan 18, 2018
    Posts: 499


    i KNOW ! those 'one year only' 44 models-and all the others so easily found...
    6inarow likes this.
  8. 31 Coupe
    Joined: Feb 25, 2008
    Posts: 294

    31 Coupe

    The 194" was unique with a 3-9/16" bore and 3-1/4" stroke, forged crank..
    The 230" had a 3-7/8" bore and 3-1/4" stroke, forged crank.
    The 250" shared the same block configuration as the 230" but with a 3-17/32" stroke, fully counterweighted cast crank.
  9. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,185


    I don't think you can get there from here with the 194 block. The photo and pfd below are a scan of the basic specs such as bore and stroke on 194 Through 292 sixes. The pfd might be easier to read.
    The differences between bore and stroke between the 194 and 250 are quite a bit

    My 4 barrel intake for my 292 came from Aussie speed and as they make a ton of stuff for that series of engines from 194 to 292 I'd have to think you can find larger size Chevy design sixes in Oz reasonably easy.
    Dang, that cost me some money as I just ordered the plenum Pig for my intake after chatting to the online rep from those guys. I've been hunting that piece for a while.

    If you were close I have a well worn 250 in my 48 that you could have for pulling it out and hauling it off. It's so worn out that it didn't have enough compression to start to drive home the last time I drove it. but it should be a builder.

    Straight six .jpg

    Attached Files:

    kidcampbell71 likes this.
  10. Mimilan
    Joined: Jun 13, 2019
    Posts: 999


    winduptoy and kidcampbell71 like this.
  11. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 6,695

    Member Emeritus

    The family of the 194, 215 (only used in Old's and Pont's instead of the 194 engine), 230, 250, and 292's; that's 5 engines to choose from, so you "should" be able to find something down there. And the age old rule still applies, "there's no substitute for cubic inches", so start with as big as you can to begin with. The 194 head, # 3864883, is a good addition to a Street 250, that has dished pistons, in order to raise the CR with it's smaller combustion chambers. Also has smaller ports to aid in down low torque. Get yourself a Clifford "6 = 8" catalog, spend some money, and have fun!!!
    I am Butch/56sedandelivery.
    Truckdoctor Andy likes this.
  12. Phil1934
    Joined: Jun 24, 2001
    Posts: 2,717


    They were used in boats. Check marine salvage yards. Mercruiser 150 is 230 cid, 160-165 is 250 cid, 200 is 292 cid. Also may come with cool finned valve and side covers.
    Last edited: Nov 7, 2020
  13. 31 Coupe
    Joined: Feb 25, 2008
    Posts: 294

    31 Coupe

    250 and 292 Chevy sixes were also used in Bedford trucks, 1970>.
  14. X-cpe
    Joined: Mar 9, 2018
    Posts: 1,302


    I remember a magazine article way back when, where they took a 292 crank and offset ground the rod journals to 230/250 size and bored a 230/250 block .030 over to come up with 308 CID. Don't remember any other details.
  15. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,185


    The 292 crank in a 250 block can be done but it takes some serious parts sorting to do it. .590 Is a lot of difference in stroke though.

    My 48 had a 194 in it when I bought it in 1973 and I put some miles on that little bugger before it used more oil than gas. Nice reliable and trouble free little engines that do pretty well in a light car but getting any real performance out of one would be a real challenge. A guy wants to save the head though as it has a higher compression ratio than the larger engines.
  16. Did they have the casting at the back of the block which bolts up to T350, PowerGlide, Etc?
  17. 31 Coupe
    Joined: Feb 25, 2008
    Posts: 294

    31 Coupe

    They have the standard Chevy V8 mountings for transmissions and flywheels.

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