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This is a discussion on Stroking... within the Internal Engine forums, part of the LSx Technical Help Section category; I have a couple of questions about stroking a block. I have been looking into building a 408 block. I ...

  1. #1
    Junior Member dougcw's Avatar
    Join Date
    Dec 2005
    Evansville, IN

    2002 Trans AM WS6


    I have a couple of questions about stroking a block. I have been looking into building a 408 block. I don't think that there is even a question of whether or not the cast iron block is a better than aluminium. Yeah the block weighs more but the strenght is there. I am still trying to decide whether or not that a power adder might be the next step. I'll have to see what the 408 feels like? I know the clutch and the 10-bolt will have to go. Regarding the 408... Are there different combos of bore and stroke sizes in the 408 cid? If there are which one is most reliable? I saw that Texas Speed is selling bare blocks for ~$600 and thought that it may be more fun to have more displacement (no replacement for) rather than putting a D-1SC on a 346 cid.

    Any help would be greatly appreciated!!!
    Mods: FAST 90mm, Nick Williams 90mm TB, TR 230/224 .581/.567 111 LSA, CC 921 springs, Hooker LTs, Hooker ORY, SLP Loudmouth, Eibach Pro Kit, Billstein HD, Baer Eradispeed, Whisper Lid, BMR SFCs, BMR Adj. LCAs, BMR reloc. brackets, HPTuners. 418HP/390ft-lbs rearwheel on a DynoJet.

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
    Join Date
    Aug 2005
    Thornton, CO

    Red Tint Jewelcoat
    2008 Trailblazer SS

    4" bore 4" stroke makes 402.
    4.030" bore 4" stroke makes 408.

    I went 402 to stay square.
    Mine is a Texas Speed motor.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

  3. #3
    Junior Member
    Join Date
    Jul 2005
    Toronto Canada
    Doug, a properly built 402 LS2 aluminum is good for 1000+ hp! Don't bother putting a anchor in the front of your car unless you plan to make 1500hp! Its just not needed. A 402 with AFR 225 heads will get you 525rwhp... You could always gap the rings a little extra for a 100 or 150 shot... But I'll tell you right now, 525rw is lots for a streetcar!!!

    520 rwhp / 484 rwtq 402 11.1:1 LS2 AFR Stroker
    497 rwhp / 435 rwtq 427 11.2:1 LS7 Stroker (mustang dyno)
    501 rwhp / 591 rwtq 396 11:1 LT1 AFR Stroker
    766 rwhp / 836 rwtq 396 + Fogger

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