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283 cam

Discussion in 'The Hokey Ass Message Board' started by nastyrod, Apr 28, 2006.

  1. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    I've seen this...http://www.jalopyjournal.com/forum/showthread.php?t=106915

    but here are my specs... 283 .30 over, double humps, plannin on a dual plane edelbrock intake of sorts, prolly 600-650 holly I want a nice rough idle and as much low end as possible but with the double humps I'm not sure how much I can get with the 2.02 valves.. so what's the best cam for a hopped up 283 street engine... puttin it in a 41 chevy fenderless bare bones. with a 12 bolt.
     
  2. RacerRick
    Joined: May 16, 2005
    Posts: 2,756

    RacerRick
    Member

    2.02 valves will not clear the 283's small bore without notching the bore. Stick with the smaller valves.

    Double hump heads also have a 62-66 cc chamber depending on the casting number. Stock 283 heads have a low 50's chamber cc. Unless you are running a dome piston, you will have very low compression.

    I would get a set of 305 heads for the 283. Get casting number 601 (my choice) or 416. They are off of early 80's 305s with the standard intake bolt angles. 601's have a 53-55cc chamber. Both have 350 sized ports and flow as well as any 350 smog head, even with the stock 1.84/1.50 valves.

    A good port job on them with 1.94/1.60 valves you can get about 240cfm intake/170 cfm exhaust. A home port job will probaly end up with around 225cfm intake, 160 cfm exhaust with the stock valves. Best of all the heads are dirt cheap and less prone to cracking than the 350 smog heads.

    You need to figure out what compression ratio you have before a cam is chosen.
     
  3. bingo what he said. - Then think small on the cam - a popular cam is the duntov cam - the milder of the two available. I am using a 1102 from summit in my 283 - well I was before I changed the intake.
     
  4. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    Yeah I was gona run pop up's to get me closer to 10:1

    So what the hell is so special about the double humps then??
     

  5. RacerRick
    Joined: May 16, 2005
    Posts: 2,756

    RacerRick
    Member

    Double humps have the most port volume (About 165cc's) and flow the best of the non-vortec heads. They usually flow about 210ish cfm on the intake and 140ish on the exhaust when stock with big valves. They factory big valve heads have about 66cc chambers because they relieve the chambers for the big valves.

    Stock smogger heads usually flow around 190-200ish cfm on the intake and 130ish exhaust. The 601 305 castings I saw flowed did 196 cfm on the intake and 136 on the exhaust all stock with 1.84/1.50 valves. They are a great head for the $25 I pay for them.
     
  6. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    then why is everybody I talk to tell me not to run them??!!!
     
  7. chromedRAT
    Joined: Mar 5, 2002
    Posts: 1,737

    chromedRAT
    Member

    it's just the issue with the double humpers on the 283. they work pretty good on 327s, 350s, etc. lots of folks have used them.

    that being said, modern aftermarket heads WORK better, but i like the double humpers because they work ok and look right in an older car.

    the powerpak heads for 283s are supposed to be pretty good heads for use in 283s and 265s, but i have also heard that 305 heads are a pretty good option too.
     
  8. 392_hemi
    Joined: Jun 16, 2004
    Posts: 1,736

    392_hemi
    Member

    Power pack heads are cheap and readily available. They'll work good with your setup.
     
  9. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    yeah but I just paid $140 for double humpers with 4k on um
     
  10. 392_hemi
    Joined: Jun 16, 2004
    Posts: 1,736

    392_hemi
    Member

    But they're not going to do you much good with the current setup. Might as well get your money out of them and get something that works. Or just hang on to them for another project.
     
  11. tomslik
    Joined: Mar 3, 2001
    Posts: 2,161

    tomslik
    Member

    are you SURE the heads are 2.02's?
    they made a lot with 1.94's.....
    and THEY WILL fit a .060 283.....
    don't know for sure on a .030 over...
     
  12. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    well no, I'll check when they come in. I thought all humps were 2.02's... no?
     
  13. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    yeah I know... just trying to justify the purchase now... I'll prolly hold on to um if I don't run em
     
  14. Brewton
    Joined: Jun 24, 2005
    Posts: 884

    Brewton
    Member

    NO - not all double hump heads have 2.02 valves, in fact most of them had 1.94s.
     
  15. tomslik
    Joined: Mar 3, 2001
    Posts: 2,161

    tomslik
    Member

    nope
     
  16. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    well $%^&**(!! ;) thanks
     
  17. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    so if they ARE 1.94's will I be ok? and if so, I'll ask my original question...
    So what cam?
     
  18. 392_hemi
    Joined: Jun 16, 2004
    Posts: 1,736

    392_hemi
    Member

    I would check with Comp Cams. They have a number of "nostalgia" grinds that are similar to the Duntov cams, but tweaked a bit to give better overall performance.
     
  19. nastyrod
    Joined: Aug 4, 2005
    Posts: 127

    nastyrod
    Member

    ok thanks! I preciate all the wisdom here.
     
  20. tomslik
    Joined: Mar 3, 2001
    Posts: 2,161

    tomslik
    Member

    yeah, i'd almost prefer 'em on the street.

    fwiw, i ran an old crower monarch .460lift/280 duration(advertised).
    ran really good in my 56 210...
     
  21. tomslik
    Joined: Mar 3, 2001
    Posts: 2,161

    tomslik
    Member

    hey, you know what ya ought to do is run a "blueprint" cam like for a 220 horse 283.
    same lift as factory but nhra will let you run any duration....
    i know you're not going stock class racing but.....
     
  22. Deuce Roadster
    Joined: Sep 8, 2002
    Posts: 9,519

    Deuce Roadster
    Member Emeritus

    I used this camshaft in my 283 plus sixty over......and it lumped pretty decent.....not so bad it was unstreetable...but enough to know it has a cam in it.......
    IF ....I was to do it again.....
    I would go with a Hydralic....


    Camshaft tech has come a long way since the 50's.....when that camshaft was designed. I like the Crane 274 HO6......click on the link below..for the specs....and description.

    http://cranecams.com/?show=browsePa...-400 C.I.&partNumber=100172&partType=camshaft
     
  23. I have had a lot of 283's in my time....
    Its easy to over carb over valve and over cam as a hot rod motor....
    It in that 41 chevy[3000lbs] will need some low end to get off the line.
    Id suggest that you at least try this......
    Use a 350 horsepower 327 camshaft[hyd] with good quality lifters.
    Use a set of 2BARRELL 283 heads and a 500CFM Edelbrock carb.
    Sorry to disagree with your plans but I have done this and it wil work.

    The small runner heads will net you better low end/Midrange performance-throttle response- with very litle sacrificed at the top end[you will still have a 7500RPM capability]

    The larger valve larger port heads will cost you on low end and barely out rev the RPM I mentioned.:)
    the 283 will be lacking tourqe on low end in that weight a car-so dont mess with it too much-
    Good luck.
     
  24. Devin
    Joined: Dec 28, 2004
    Posts: 2,369

    Devin
    Member
    from Napa, CA



    With double humps, 30 over and flat tops, what kind of compression ratio are looking at? Sorry, I don't know the formula.
     
  25. parksquijada
    Joined: Aug 6, 2008
    Posts: 316

    parksquijada
    Member
    from norcal

    not knowing if you have valve reiefs or how deep they are comp on that motor would be approx. compression ratio 9.34 with a head gasket of 3.875. flat tq curve from 2000-3500 370 lb/ft and hp over 260 from 4000-5000. i could play around with my dyno program to optimize if you want. cam is 200-210 deg @.050 and 250-260 deg adv. ran at .450 lift. program is within 4-5 % accurate.
     
  26. E.C.
    Joined: Apr 7, 2007
    Posts: 608

    E.C.
    Member
    from Tx

    solid roller Isky...call them and see what they have.
     
  27. olscrounger
    Joined: Feb 23, 2008
    Posts: 4,770

    olscrounger
    ALLIANCE MEMBER

    what Choprods said--PP heads--I owuld use the "097" solid cam as used in 57-62 Chevys--soild cam with good performance and good low/midrange--2.02's will kill the bottom end--you need velocity

    this is the same cam I have in my 57 BelAir factory car with fuel injection--283 CI/283 HP--same cam was in the 270 HP dual quad cars---runs well and not too noisy--30/30 and 350HP 327 a little lumpy for a 283 and kills the bottom end unless you have a manual trans and fairly low gears
     
  28. 55chevr
    Joined: Jul 12, 2008
    Posts: 985

    55chevr
    Member

    You could use the .0030 / .0030 solid lifter cam that Chevy used in 65 / 66 Corvette ... streetable with a stick trans ... if using an automatic the Chevy cam from the 65 Corvette 350 HP hydraulic lifter should work.
    Joe
     
  29. 69fury
    Joined: Feb 24, 2009
    Posts: 1,452

    69fury
    Member

    the rumble/thump/choppy idle is from cams that inherently favor high end power and NOT low end torque. If it's just the SOUND you want (seems to be) but want to keep the lower torque, you could check out the THUMPER line of cams from Comp Cams. No experience with them myself, but i believe that's specifically what they are designed for. (tho it still may be hard to achieve with that small of a mill)
     

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