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8 sec. LS turbo engine buildup

This is a discussion on 8 sec. LS turbo engine buildup within the Forced Induction forums, part of the LSx Technical Help Section category; I thought it would be cool to build a LS motor with help and insite from it's 7, 8 and ...

  1. #1
    "When performance counts"
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    8 sec. LS turbo engine buildup

    I thought it would be cool to build a LS motor with help and insite from it's 7, 8 and 9 second members. I tried a search and didn't find anything like this... SO...

    I just got back from PRI and I'm amazed at all the cool stuff that's coming out for the LS series motors. I have decided to take out the 427CI BBC in my 70 Chevelle and build up a turboed LS motor. I would like to build a "best bang for the buck" motor that uses as much factory stuff available, as long as it will support 1000+/- hp. This is a street car with 3.73's, T400 and full weight that will have fuel injection and A/C. I would like to avoid the LSX stuff for price reasons and I'm thinking gen 4 stuff. I have most of this figured out on paper but was looking for validation. If I'm way off on my theories then let me know why. I will try and ask only a few questions at a time until it's all down on paper.

    Now for the questions:
    What block would be best? (iron or alum)

    What stroke and rod combo will be best for a 4" bore, keeping the piston compression height in mind? What brand?

    What heads would be best? (LS3, L92, other or aftermarket)
    Last edited by tt69camaro; 12-17-2008 at 03:51 AM.

  2. #2
    3-Time F-Body Offender doozjamann's Avatar
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    Not sure about the others but an iron block would be better that aluminum on boost.

    Talk to the turbo guys. A properly built small block can get you 1500hp all day.

    Here is an article to read.

    http://bankspower.com/techarticles/s...-facts-of-life

  3. #3
    TunedbyFrost.com Tuner Frost's Avatar
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    Iron 370 (big bore) and a T6 88 to 90mm turbo. Aftermarket heads have a thicker deck, and the 4bolts/cyl are really what limits these setups. If the budget allows something like AFR or ETP it'd be nice and make a lil more on pump gas, but some well-worked factory LS6 castings will get there too. Go big studs for the heads. J&E or Wiseco pistons, total seal rings. An LS6 intake will work just fine believe it or not. Buy a GOOD meth kit like the alkycontrol kit (don't pinch pennies here, can cost you your motor).

    It's not all about iron for the block though. If you go 402 LS2 stroker, those blocks too hold up very well and are quite a bit lighter. If you go 402, 90mm would be the smallest turbo that you'd run...

  4. #4
    "When performance counts"
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    When you say "big bore", do you mean 4" or 4.125?

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