If you are not able to login to the forum, please Contact Us here to let us know. Thanks!

Support FSC and see no ads! - Click Here
Page 2 of 2 FirstFirst 12
Results 21 to 29 of 29
Like Tree2Likes

Another OBS Suburban - new L31 or go LS

This is a discussion on Another OBS Suburban - new L31 or go LS within the Small Block forums, part of the Performance category; Originally Posted by azfansinnc Well, the L31 in the 99 is toast. It runs but immediately codes with a p0304 ...

  1. #21
    Registered User
    Join Date
    Jul 2005
    Location
    Euless, Texas
    Posts
    6,127

    Re: Another OBS Suburban - new L31 or go LS


    Support FSC and see no ads! - Click Here
    Quote Originally Posted by azfansinnc View Post
    Well, the L31 in the 99 is toast. It runs but immediately codes with a p0304 with good reason. I checked the compression on #4 and it has 65psi dry and 180 with oil. At minimum, rings are bad.

    Decision time. I either need to mix and match and remotor one or just sell off the 99.

    Sent from a can on the end of a string
    A few years ago Ebay was loaded with Marine 6.2 longblocks. Basically a HT383 with a cheaper price tag.

    EDIT....Just looked and they are still there.

    http://www.ebay.com/itm/6-2L-New-Vor...ht_3465wt_1362
    Last edited by Fast305; 03-10-2014 at 10:09 AM.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

  2. #22
    Registered User
    Join Date
    May 2012
    Location
    Raleigh, NC
    Posts
    790
    Looks like the same mold the use for the Ht383 with forged crank. Perhaps a cam change and the stroke is the standard 3.75 vs 3.80. For that price, the HT383e is about the same once you take into account the add ons.

    I called a local builder yesterday and he can put together a 383 for me using my block and heads as the foundation. Cast crank, hyper pistons, choice of cam. My block, heads, rods (Arp bolts). He rattled of a bunch of particulars and has done several in the past. Part of his warranty process is to assemble from disty, intake to pan and balancer, water pump, etcetera. Timed and full of oil.

    Total price is around $2700.

    Any thoughts?

    Place is Billsspeedshop in Fuquay Varina, NC.


    Sent from a can on the end of a string
    The Black Sheep - 1998 GMC K1500 Suburban SLT - 5.7L Vortec, NP246, 265/70/18 Bridgestone Dueller Revo 2. - Hecho en Mexico, baby!
    Mods: 4L80E, 3.73's. 0411 PCM by Lextech

  3. #23
    Registered User
    Join Date
    Jul 2005
    Location
    Euless, Texas
    Posts
    6,127

    Re: Another OBS Suburban - new L31 or go LS

    Quote Originally Posted by azfansinnc View Post
    Looks like the same mold the use for the Ht383 with forged crank. Perhaps a cam change and the stroke is the standard 3.75 vs 3.80. For that price, the HT383e is about the same once you take into account the add ons.

    I called a local builder yesterday and he can put together a 383 for me using my block and heads as the foundation. Cast crank, hyper pistons, choice of cam. My block, heads, rods (Arp bolts). He rattled of a bunch of particulars and has done several in the past. Part of his warranty process is to assemble from disty, intake to pan and balancer, water pump, etcetera. Timed and full of oil.

    Total price is around $2700.

    Any thoughts?

    Place is Billsspeedshop in Fuquay Varina, NC.


    Sent from a can on the end of a string
    The 395 Marine cam IS the Ramjet/HT383 cam and the displacement went from 377 to 382 a few years back on the 6.2. Mercury went from calling them the 377 to the 6.2 when the stroke was increased. The HT383E was over $5k last I saw it.

    If the 383 is properly built I say it will run for a long time and make good power.

    Not sure how he is going to time it, since that requires a Scan Tool and a running engine to set the CMR.
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

  4. #24
    Registered User Doober's Avatar
    Join Date
    Sep 2003
    Location
    Catalina, AZ/Swartz Creek, MI
    Age
    32
    Posts
    3,673
    I suppose maybe we got lucky when we did the intake gaskets a few years back... No SES light when we put it all back together.

    via Tapatalk

    '92 Sierra (TBI 383/Vortecs/Comp 08-412-8/EBL/4L60/3.08s), '78 Malibu (Vortec'd 350/4-speed/2.29s), '87 Pontiac Fiero GT (2.8 v6/5-speed)


  5. #25
    Registered User
    Join Date
    May 2012
    Location
    Raleigh, NC
    Posts
    790
    He probably wasn't thinking about the cam retard on the vortec. I would need to do a crank relearn anyway upon install. Easy.

    The builder is a character to say the least. However, Several guys have 200k motors he put together. I'm still looking at options.

    The best price on the ht383e I have found is around $4500. It certainly looks built right but I can't spend that kind of money. An extra $800 over a crate 350 maybe.


    Sent from a can on the end of a string
    The Black Sheep - 1998 GMC K1500 Suburban SLT - 5.7L Vortec, NP246, 265/70/18 Bridgestone Dueller Revo 2. - Hecho en Mexico, baby!
    Mods: 4L80E, 3.73's. 0411 PCM by Lextech

  6. #26
    Large Marge sent me SUBURBIAN's Avatar
    Join Date
    Jul 2010
    Location
    USA
    Posts
    2,002

    Re: Another OBS Suburban - new L31 or go LS

    I don't think you need a stroker. You might *want* one, but a 350" motor is all that's needed.

  7. #27
    Registered User
    Join Date
    Jul 2005
    Location
    Euless, Texas
    Posts
    6,127

    Re: Another OBS Suburban - new L31 or go LS

    Quote Originally Posted by SUBURBIAN View Post
    I don't think you need a stroker. You might *want* one, but a 350" motor is all that's needed.
    I agree that a 350 is all that is "NEEDED" but I am also guessing you have not tried to tow with a heavy vehicle that has a 4L80E have you???
    1997 G1500 Cobra Conversion, 5.7, 4L80E, 3.73 14-bolt 9.5", L31 Marine Intake, CFM TB, 02 MAF, 0411, Custom cam. Doug Thorley Tri-Ys, full exhaust soon.

  8. #28
    Registered User
    Join Date
    May 2012
    Location
    Raleigh, NC
    Posts
    790

    Another OBS Suburban - new L31 or go LS

    I can see it both ways. If this was just a beater grocery getter, the 350 would suffice. My budget may not allow for any more than that. My wife certainly thinks it's not necessary.

    I have been driving the 98 for a few months now with the 350 and the 80e. It's not a rocket but respectable. I am fairly certain the 0411 program helps a little. It has 200k miles on it too.

    I took it skiing last month with 8 people in it and the 80 does not like to downshift on the hills. I have only towed the other burb across town and 2 miles on i85.

    Oh, forget logic. There is no replacement for displacement and I get bored with what everyone else has. I really want the extra power if I can get it. Just because it's a burb doesn't mean it can't be fun. Be nice to have something that pulls like a freight train from 1500-3000. The truck spends a lot of time at 2k.

    I want to build up one of these two trucks for another 100k. I still need to decide which one.


    Sent from a can on the end of a string
    Last edited by azfansinnc; 03-11-2014 at 06:36 PM.
    The Black Sheep - 1998 GMC K1500 Suburban SLT - 5.7L Vortec, NP246, 265/70/18 Bridgestone Dueller Revo 2. - Hecho en Mexico, baby!
    Mods: 4L80E, 3.73's. 0411 PCM by Lextech

  9. #29
    Registered User
    Join Date
    May 2012
    Location
    Raleigh, NC
    Posts
    790

    Another OBS Suburban - new L31 or go LS

    Update: back looking at motors. I plan on pulling the 99 motor as a base if the build looks right. What cam so you guys have experience with In a 383 Vortec MPFI injected truck? It will be retuned locally after the fact to be optimized. 87 octane preferred.

    98 k1500 sub
    4l80e
    3.73

    On second thought, I'll start a new thread.
    Last edited by azfansinnc; 08-02-2014 at 05:22 PM.
    The Black Sheep - 1998 GMC K1500 Suburban SLT - 5.7L Vortec, NP246, 265/70/18 Bridgestone Dueller Revo 2. - Hecho en Mexico, baby!
    Mods: 4L80E, 3.73's. 0411 PCM by Lextech

 

 
Page 2 of 2 FirstFirst 12

Bookmarks

Posting Permissions

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