Ls-4? Whats It Worth?
Results 1 to 7 of 7

Thread:
Ls-4? Whats It Worth?

  1. #1
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default Ls-4? Whats It Worth?

    Soooo. I've been looking for a 4 bolt bbc. for my next motor.The one I have now is .060. anyways casting # 3999289, would that be a decent builder? He wants 500.00
    Should that motor have rect port heads? Any advice/thoughts are appreciated.
    Another Hot Boat refugee
    Quick reply to this message Reply  

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
    Join Date
    Dec 2007
    Location
    Newton Ks.
    Posts
    6,834

    Default

    It should have rectangle port heads ........ if you want 500+ cubes, or 7,000 RPM out of the motor. Otherwise you are much better off with large ovals on a 454.

    It may or may not be 4-bolt, could be either or. How much HP, how much RPM do you plan on spinning it.
    3999289....454.......71-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main caps


    It'd be a good buildable motor, $500 is fair for a running motor IMO.
    Anticipate $170 to re-work the stock rods with ARP bolts if you re-use them.
    Even GM says to throw away the knurled 3/8 bolts on an overhaul and get new.

    Stock is likely a cast crank. Only good for 600+ HP under 6,000RPM, or thereabouts.

    An actual LS-4 is a 1970 only production piece. Small oval heads and forged crank, 345HP on a hyd. cam.
    Quick reply to this message Reply  

  4. #3
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default

    Thanks Smokin, he says it's a 1972 so I guess that means it's not an ls-4? also it has 049 heads for what ever thats worth. If it's not a 4 bolt I'm not going there. A steel crank would be an added bonus, but it sounds like thats not likely. btw what year(s) would be the best to look for in a gen IV BBC. Or maybe I should ask what years to avoid? I thought my motor guy told me all 454's after 1987 would be 4 bolt blocks because they only used them in trucks after that year. I'm not overly concerned with the heads,crank, and rods, because I'm already set there(except my crank is 427 and I'd rather a 454)
    Another Hot Boat refugee
    Quick reply to this message Reply  

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member Brendellajet's Avatar
    Join Date
    Dec 2007
    Location
    Ladera Ranch
    Posts
    2,135

    Default

    I'd check the bore first...$500 is a good deal if its got life left in it.
    Quick reply to this message Reply  

  7. #5
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
    Join Date
    Dec 2007
    Location
    Newton Ks.
    Posts
    6,834

    Default

    Quote Originally Posted by H20MOFO View Post
    also it has 049 heads for what ever thats worth.
    353049 is the Large oval port head that replaced the older '781 casting, identical measurements.
    NORMALLY the 049 seems to have the small valves (2.065/1.72) and can be a very good high-perf head with a stage 1 porting to clean them up and put the factory large valves in them (2.19/1.88)

    Quote Originally Posted by H20MOFO View Post
    If it's not a 4 bolt I'm not going there.
    50-50 dice toss. Only way to know is to pull the pan. My info states there was no difference in the Mk-IV block casting 2-bolt or 4-bolt, just a skipped machining step, thus, for under $500 that can be MADE into 4's, if so desired.
    I had posted an article from a machine shop that specializes in it, it's gone now tho, on "another" boating website.

    Quote Originally Posted by H20MOFO View Post
    A steel crank would be an added bonus, but it sounds like thats not likely.
    Very FEW factory motors left with a forged crank, especially the 454's, pretty much 1970/71 LS-5/6/7 production.

    Quote Originally Posted by H20MOFO View Post
    btw what year(s) would be the best to look for in a gen IV BBC. Or maybe I should ask what years to avoid? I thought my motor guy told me all 454's after 1987 would be 4 bolt blocks because they only used them in trucks after that year. I'm not overly concerned with the heads,crank, and rods, because I'm already set there(except my crank is 427 and I'd rather a 454)
    Honestly, I would buy any of them, depending on what I wanted to do with the motor.
    If I was wanting to build a serious powerhouse blown motor, I'd prob start on a 4-bolt aftermarket block.
    Much less, any factory block will do, and as I said, can be made a 4-bolt for minor expense.
    $800 gets a better forged steel crank than any of the factory offerings (rarely was 4340 alloy used).

    I'm running '049 heads myself, just had them worked on as above. Going to see what happens this spring.
    Been a very strong motor for a low-comp. special on 1 carb (and smaller than everyone says to run too).
    $1800 aprox spent and I think I will actually be ahead of where the same $$$ would put me in a set of aftermarket heads from the box.
    Some of that cost was minior repair (cracked seat and a leaking guide (same hole), so all ex. seats got replaced and all guides did too, and reduced in size to loose weight).
    Quick reply to this message Reply  

  8. #6
    Senior Member H20MOFO's Avatar
    Join Date
    Dec 2007
    Posts
    4,288

    Default

    Thanks Smokin, so all 4bolt chev blocks (454's)are pretty much cookie cutter?
    Keep in mind I'm just talkin about the block.
    Another Hot Boat refugee
    Quick reply to this message Reply  

  9. #7
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
    Join Date
    Dec 2007
    Location
    Newton Ks.
    Posts
    6,834

    Default

    Yea, pretty much. All were the same castings. 2-bolt/4-bolt was just a machining diference in boring them.
    Quick reply to this message Reply  

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95