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Can you build a real Chevy 302?

Discussion in 'The Hokey Ass Message Board' started by Lucky Strike, Sep 27, 2005.

  1. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    Cool! I wonder if the Offy crossram can still be bought new. Last I heard, P.A.W. was selling those. :) By the way... Cool Flopper body! :)
     
  2. Back in the day we called them 301 chevies. A 283 with a 4 inch bore which was quite an oversize but they worked. Then in 69 Gm built them in the RS camaro. hat was more based on a 327 small journal block.
    Of course if you only want 7000 a 350 can handle that with ease and forever.
    Don
     
  3. Lobucrod
    Joined: Mar 22, 2006
    Posts: 4,122

    Lobucrod
    Alliance Vendor
    from Texas

    As I mentioned earlier in this thread I'm building a 302 for my midengine vair. The only pistons available are the popups. I'm not real thrilled about running race gas but this is going to be a toy anyway and wont get driven much. anyway to the point

    Has anyone considered using 6" rods and 350 pistons to build a 302? I just happen to have a partial set of aluminum 6" small journal rods lying around so I slipped a 350 flat top onto a 6" rod (full floating pin) and slid it in my 327 block without rings and attached it to the 283 crank. turned the crank over to get the piston up to the top and it appears to be down in the hole about .040 to .050. 6" rods are still available for the small journal cranks from a couple of suppliers so this should be a way to build a 302 with low enough compression to run pump gas and the rod length to stroke ratio will be an ideal 2 to 1 ratio. Also the 350 flat tops are the cheapest piston available.

    So can anyone shoot any holes in this idea?
     
  4. Shaggy
    Joined: Mar 6, 2003
    Posts: 5,207

    Shaggy
    Member
    from Sultan, WA

    I put a set of world heads on mine that drop the compression to around 10 to 1, not sure how the camel toe on the tops of the pistons it gunna like it. Kinda rethinking it and thinking i might go camel humps and thick gaskets instead.
     
  5. PopPop
    Joined: May 20, 2010
    Posts: 2

    PopPop
    Member
    from Virginia

    Frank, you got your information correct. Chevy power has more "tails" bantered about than imaginable. Hats off to you!

    One other poster stated all 350's were LJ, not so. '67 Camaro SS 350 was a SJ engine for sure!
     
  6. MERC 55
    Joined: Mar 26, 2007
    Posts: 277

    MERC 55
    Member

    Of course you can alway's build a 302 from a 292 l6
     
    joel likes this.
  7. fanspete
    Joined: Oct 22, 2006
    Posts: 686

    fanspete
    Member

    Man, I really don't want to do this, since it technically O/T. 302s ONLY came in '67-'69 Z/28s, but you could have one with the RS package.
    Just like Don says, real high winders! I've got a tricked out '69 302 on a stand and don't really know what to do with it!
     
  8. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    If it is the real thing, sell it to someone who needs it to restore his.
     
  9. Lobucrod
    Joined: Mar 22, 2006
    Posts: 4,122

    Lobucrod
    Alliance Vendor
    from Texas

    Here's a video of the 302 on the test stand and a pic of it in the Vair. Quiet exhaust I have on it sux
    [​IMG]
    <EMBED height=385 type=application/x-shockwave-flash width=480 src=http://www.youtube.com/v/-NW6pX1gEIU&hl=en_US&fs=1& allowfullscreen="true" allowscriptaccess="always"></EMBED>
     
    kidcampbell71 likes this.
  10. uglydog56
    Joined: Apr 8, 2008
    Posts: 331

    uglydog56
    Member

    I have a 68 302 crank that needs one journal built up (spun rod bad) if someone wants it for a period build or a restoration. I will never use it. Forged, large journal, 10/10 except for the bad journal I think it was #4. PM me.
     
  11. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    You still have it and what are you asking for it???
     
  12. stevens2@htva.net
    Joined: Jul 26, 2008
    Posts: 59

    stevens2@htva.net
    Member
    from 14883

    I have a forged 3" 283 CRANK, small journal cheep.
     
  13. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    Reason I asked is for the last 3 months I've been itchin' to put one together. I'll make up a price list of it would take to assemble one of these screamers using a new crank and pistons and post the amount. This should be fun..
     
  14. STILL OLD
    Joined: Jan 18, 2010
    Posts: 77

    STILL OLD
    Member
    from tennessee

    4 bolt mains are good, but We bored 2 bolt main 283 bolcks to 4 inches long before 4 bolt mains were thought of. But they weren't 302's, We called them 301's and could twist them to 7 grand with the right stuff in them
     
  15. arca39
    Joined: May 19, 2008
    Posts: 310

    arca39
    Member
    from summit il

    my brother built on in the 80's still has it.. he used a small journal 327 with a 64 283 crank. 12:1 slugs with roller rockers and a victor jr singleplane intake with pete jackson gear drive----it ran great with a 650cfm carb....
     
  16. I can't read all 195 previous posts, so forgive me if I am duplicating a post. The 283 crank in a 327 block was originally done to get into a specific cubic inch class for drag racing.
     
  17. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    I have a Holley 650 dp I just got done rebuilding with the "stock" chevy 302 jetting... I also have a factory LS-6 454 Holley 780 which was the same carb used on the Z/28 except for the jetting and maybe the power valve. Plans call for the Z/28/LT-1 intake if I could find one cheap and in great shape.... Or an Edelbrock air-gap rpm intake.. Holley also has a copy of the Z/LT-1 intake which looks pretty cool....
     
    Last edited: Sep 12, 2010
  18. doctorZ
    Joined: Apr 10, 2006
    Posts: 1,243

    doctorZ
    Member

    i was planning on building one, but i'm worried about around town driving with it since it has to rev so high. i have a T5 5-speed with overdrive, 4.11 gears and 750x16 tires out back. i hope it'll still be enjoyable on the street.
    on the other hand, an engine that'll rev to 8K would sound amazing with my 360 exhaust ...
     
  19. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    The stock forged connecting "X" rods found in '70-'71 chevy or GMC pickups with the 4-bbl 350 motors are beefier than the regular passenger car rods... I might look into those... I'll check and see if Scat makes a LJ 3.00" stroke crank... I hope they do!!
     
  20. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

  21. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    Last edited: Aug 6, 2011
  22. 40fordtudor
    Joined: Jan 3, 2010
    Posts: 2,503

    40fordtudor
    Member

    Back in the 60's we went .125 over on 283's for 301 ci and I can't remember anyone having trouble---my 57 was .060 over for 292 ci and turned 7000 with no problem. I am unfamiliar with a 327 with a 283 crank--should be a good runner.
     
  23. rcjohnson
    Joined: Sep 16, 2010
    Posts: 4

    rcjohnson
    Member
    from sw ohio

    I absolutely love this thread! Back in the 60s I was addicted to sb chevys and if I wasn't working on them I was reading about them. The Smokey Yunick article is 100% accurate. I worked at a Chevy dealership and the service manager built one for a 55 210. I had a 55 with a bored out 283 to 301. I had the old 098 fuel cam in it and of course larger valves and all the goodies along with a 4:56 rear. The service manager was running absolutley stock parts that he bought over the counter at the shop and when we paired these cars on an old road I could not believe it. That baby would fly. He had a dumbass attack one day and decided to put an aluminum flywheel in it and that night he missed a shift and brought the flywheel through the bell housing and floor. The dash finally stopped it. Long Live the Mighty Little Small Block Chevrolet!
     
  24. studenut48
    Joined: Mar 23, 2008
    Posts: 330

    studenut48
    Member
    from Hanson, Ky


    I can say you are right about that, because I have a 302 that the block was cracked. The dealer changed out everything to a 327 T, which I guess is the truck block maybe? But yeah 327 block.
     
  25. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    I wish I knew where all the '69 302 c.i. GM long block and short block assemblies went too...... :(
     
  26. Jingles
    Joined: May 6, 2009
    Posts: 100

    Jingles
    Member

    It's 6 of one and half dozen of the other. The 4 bolt block has more holding power on the caps but the block is weaker in the webbing areas. The best thing to do is to take a 2 bolt block and have "splayed" 4 bolt caps installed by a COMPETANT machine shop that is experienced at installing the splayed caps.
     
  27. 40fordtudor
    Joined: Jan 3, 2010
    Posts: 2,503

    40fordtudor
    Member

    Back in the "old days" we punched a 283 .125 for 301 c.i.---i never had any heating issues and that sucker would scream--
     
  28. Hmmm....I know there is one hibernating in my garage, got it in early 70's from a Chevy dealership, never used it, it makes some peoples eyes widen when I tell them about it:eek:. Then they ask the price and they usually leave or change the subject!
     
  29. Deuces
    Joined: Nov 3, 2009
    Posts: 21,306

    Deuces
    Member
    from Michigan

    That much huh???....... :eek:
     
  30. 66L-79
    Joined: Mar 4, 2008
    Posts: 345

    66L-79
    Member

    The block you are talking about is the 65 to 67 Nova block that was used for those three years only in a 283 and the 327 I have both of those motors now. I also have two of the original 302 motors.
     
    Deuces likes this.

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