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Preping for the 402.

This is a discussion on Preping for the 402. within the Internal Engine forums, part of the LSx Technical Help Section category; I picked up a LQ9 block today and will be ordering a rotating assembly towards the end of next month. ...

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    Preping for the 402.

    I picked up a LQ9 block today and will be ordering a rotating assembly towards the end of next month. I've searched a lot but can seem to find whether or not the block will have to be notched for a 402. Anyone know off hand?

    For those interested in the build I'm going 402 with Callies CompStar crank and rod's, Patriot Performance LQ9 stg 3 heads, and not sure on the cam yet. Building for a ATI setup next summer.

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    MEMBER 5150's Avatar
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    Can't answer that but take pics of the build.
    Lt's,SFC,3,600 Fuddle stall,Spohn Adj. tunnel mount torque arm, BMR LCA,Ls6 intake,Air lid,Under drive pulley,S60 rear,Frost tune and a few more things I cant remember.

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    I will be taking a lot I'm sure, but don't sit around waiting. lol It won't be finished until summer 2012 at best.

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    The block will have to be honed/bored out for the bigger diameter pistons.

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    Yeah, I was aware of the machine work for the pistons. I meant will it have to be notched for the stroke of the crank. I may end up doing a little something different and go 3.90 crank and 4.07-08 piston for a few more ci's with a shorter throw.

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    Grand Imperial Wizard Sarge's Avatar
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    I have that setup in my GTO. LQ9 408 Stroker. Lunati crank.
    No knotching required.

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    Quote Originally Posted by Sarge View Post
    I have that setup in my GTO. LQ9 408 Stroker. Lunati crank.
    No knotching required.
    The 3.90 crank and 4.08 piston?

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    Member Speed_kills_WS6's Avatar
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    Why do a 402 if you have an iron block? Might as well go ahead and do 408. It'd be different if it was a LS2 block.

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    Member Jay37's Avatar
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    play aroung with this guys

    D=(3.14*R^2) S * N

    D displacement
    R radius, sore bore divided by 2
    S stroke
    N number of cylinders

    So in sarges case
    I am assuming things again haha but I'm assuming he has an 4.030 bore and 4.000 stroke

    408=(3.141*2.015^2) 4.000 * 8


    Who is wishing they paid attention in algebra?

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    Grand Imperial Wizard Sarge's Avatar
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    Yup.....^^

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    Quote Originally Posted by Speed_kills_WS6 View Post
    Why do a 402 if you have an iron block? Might as well go ahead and do 408. It'd be different if it was a LS2 block.
    That's why I'm thinking 3.90 and 4.08. That would be 408ci....I think.

  12. #12
    Grand Imperial Wizard Sarge's Avatar
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    Old drag racing saying......
    Bore Diameter equals horsepower.
    Longer Stroke equals torque.

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    Member Jay37's Avatar
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    ^^^ for sure

    Think about it guys
    tractor= long stroke small bore
    dirt bike=short stroke large bore

    Which one would you expect to be entering a race?

    HAHA edit.... some of these street cars are heavy.

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    2001 3.8 Black - sold
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    ok so whats a good place to get an LQ9.....

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    Slow'er'Ass Mr. Luos's Avatar
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    Anymore, I would recommend the aluminum blocks.
    The iron is more sturdy, but it isn't going to matter unless you are looking at 850-900+ HP.

    Quote Originally Posted by Sarge View Post
    I have that setup in my GTO. LQ9 408 Stroker. Lunati crank.
    Have you changed something since Nelson did it??
    Thought it was 402 with Eagle crank and lunati rods. That is what Nelson's site shows it as. Damn near the same internals as my old motor.

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