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rebuild the 346 or stroke it to 383 or 402?

This is a discussion on rebuild the 346 or stroke it to 383 or 402? within the Internal Engine forums, part of the LSx Technical Help Section category; Soon as i can get another DD i am goin to pull the old Z in for some TLC just ...

  1. #1
    Member txz28's Avatar
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    rebuild the 346 or stroke it to 383 or 402?

    Soon as i can get another DD i am goin to pull the old Z in for some TLC just wonderin what you guys thought ...rebuild the 346 but install beefed up inners you know...build it for spray and slap some nice heads and a nice cam in it or how much more would i be lookin at to stroke it out to a 383 or larger? lookin for some info here guys and actualy not even sure where to begin research lol i would like to brake into the 450 or higher range on the horses

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    Senior Member slims00ls1z28's Avatar
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    450 with spray is quite easy with a stock LS1. No need for stroker kits etc if your only goal is 450 with some spray. It all depends on what you are willing to pay and how far you want to go. With a stroker 450 N/A is about average power but cost a bit more. An LS1 can only go up to a 383 safely anything bigger and you need a different block such as an LS2/3/x or LQ4/9 6.0

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    Member txz28's Avatar
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    well the 450 range would be the low end i know the stock ls1 can handle a ton of spray but i want somethin that will hold up and give me a lil more room to add to later down the road (i gues i should have included that with the first post) . what kind of cost would i be lookin at to go to the 383.

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    Senior Member slims00ls1z28's Avatar
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    The rotating assembly is anywhere from 1500 to 1800. Then of course you need to include gaskets, new head bolts, machining/balancing etc. Roughly for just a 383 build on an exhisting LS1 block around 2500 realistically. That is not including any other parts of course such as cam heads tune etc.

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    Member txz28's Avatar
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    now if i did the 383 build would that be considered stage 3 or the ls2 ported heads? thanks for your help so far lol

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    Member txz28's Avatar
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    isnt the 383 the 6.0 ls2?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by txz28 View Post
    isnt the 383 the 6.0 ls2?
    The LS2/LQ9 blocks are 364's.


    Personally, if you don't want more than 450 or so RWHP on the spray, I would rebuild the stock block. Cheapest option for a forged motor.
    Don't stroke the stock block...if you do stroker, you will want a stroked LS2/LQ9.

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    Member txz28's Avatar
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    well i shouldnt have put that 450 number in there lol i would like at least 450 more the better but i dont want so much to where i cant drive the damn thing lol

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    Slow'er'Ass Mr. Luos's Avatar
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    Well a mild H/C 347 can make 425RWHP....plus spray. Can use stock block and stock crank.

    Mild 402 can make 475RWHP pretty easy. Requires new block and new crank.

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    Member txz28's Avatar
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    would the 6.0 "truck block" work ?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by txz28 View Post
    would the 6.0 "truck block" work ?
    That is the LQ9.
    And yes, it will work.

    I am using that block.

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    That is the LQ9.
    And yes, it will work.

    I am using that block.
    that is my next blcok if i kill my LS6... i haven't yet *knock on wood*

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    Member txz28's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    That is the LQ9.
    And yes, it will work.

    I am using that block.
    ok what kind of heads would go with that block is that what slp and other speed shops call the l92 heads?

  14. #14
    Slow'er'Ass Mr. Luos's Avatar
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    I am running Patriot Stage III LS6 heads on mine.

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    Member txz28's Avatar
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    how driveable(is that even a word) lol is your t/a

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    Slow'er'Ass Mr. Luos's Avatar
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    Once warmed up...drives great. Still working on the cold start tune.
    Wouldn't want to daily drive it, but it isn't a pain in the ass to drive.

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    Pony Hater UKXK189's Avatar
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    Sorry for the partial thread jack, but what's the difference between the LS2 and the LQ9 as far as performance goes?

  18. #18
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by UKXK189 View Post
    Sorry for the partial thread jack, but what's the difference between the LS2 and the LQ9 as far as performance goes?
    The blocks without internals??

    The difference is 80 pounds. LS2 is aluminum, LQ9 is iron.

  19. #19
    Member txz28's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Once warmed up...drives great. Still working on the cold start tune.
    Wouldn't want to daily drive it, but it isn't a pain in the ass to drive.
    no i wouldnt drive it every day just when the weather is nice and on the weekends to meets and what not say 3 times a week like 200 miles or so a week or is that pushin it ? and on the warm up you talkin about durin winter up there or just normal first thing in the mornin start ups?

  20. #20
    Senior Member cam02ss's Avatar
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    Ditch the stock block and get yourself either an aluminum or iron block 402/408.
    Luos has the aluminum 402, I've got an iron 408. IMO if you're going to spray a decent sized shot- go with an iron block. I dunno...Louis and I may differe in opinions about this.
    Last edited by cam02ss; 08-08-2008 at 11:11 AM.

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