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LS7 engine

This is a discussion on LS7 engine within the External Engine forums, part of the LSx Technical Help Section category; How hard would it be to swap out an LS1 engine from a 98 Camaro, and replace it with GMs ...

  1. #1
    Member cobrahunter's Avatar
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    LS7 engine

    How hard would it be to swap out an LS1 engine from a 98 Camaro, and replace it with GMs LS7 small block? Apparently is has an electronic throttle body; mine uses the cable. I mean, sure...$14,000. But 7.0 liters, almost 430 c.i., 500HP...over and done with.

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    Junior Member litemup02's Avatar
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    You can pull those #'s out of your ls1...hell more than that, for half the cost. Just my .02

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    If I had half of that I believe that I could get 500hp with just heads, cam,headers,intake and a good catback setup.

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    Senior Member ninobrn99's Avatar
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    the ls7 is a small block?? there are quite a few people close to the 500hp mark on a 346. Its about proper research. a 402 or 408 could get you that at a fraction of the cost too.

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    Senior Member ninobrn99's Avatar
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    but to answer your question, you should be able to swap the motor and use the stock pcm. change over the TB to a fast cable driven. That would be my guess. The people to ask would be Katech. They've already done it

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    Member cobrahunter's Avatar
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    Wow! Quick response. Thanks. It's just that if I ever had to replace the motor, while I would love to be able to drop in a 572, this one would be more realistic for me.

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    Senior Member ninobrn99's Avatar
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    well if you have that kind of money to throw at it, then go for it, but you could have something built to have the same power for a lot less.

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    We'll be back... GatorSS's Avatar
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    Quote Originally Posted by ninobrn99 View Post
    the ls7 is a small block??
    Yes, the LS7 is a small block.

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    Senior Member ninobrn99's Avatar
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    isnt it 7.0 liters? 427 cu. in.? I thought that would be considered a big block...at least in the old days ( not that im from them) up the 383 was still small and from 396 on up was considered big..or up to 396 small and then anything bigger was a big block. please explain.

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    Likes twisty roads bene's Avatar
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    I didn't think cubic inch has anything to do w/ the size of a block.

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    Senior Member ninobrn99's Avatar
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    guess not...i know they're resleeved, but didnt know if they used a 5.7 block or 6.0 block...i guess with the new gen 3 on up it doesnt matter as much as it did in the old days.

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    Senior Member ninobrn99's Avatar
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    LS1 Darton M.I.D. Sleeved Block
    4" Crank
    LS1 6.125" Rods
    im guessing the bore is 4.125 so maybe they're using a c56 block or 6.0.

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    Junior Member dougcw's Avatar
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    Quote Originally Posted by ninobrn99 View Post
    isnt it 7.0 liters? 427 cu. in.? I thought that would be considered a big block...at least in the old days ( not that im from them) up the 383 was still small and from 396 on up was considered big..or up to 396 small and then anything bigger was a big block. please explain.
    I think the big/small block has to do with the size of the block. LS7 is essentually a LS2 bored and stroked. I think the head arrangement also will tell if it is big or small block. Big blocks have staggered valve trains, Small blocks line up in a straight line.
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    Senior Member ninobrn99's Avatar
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    thanks. i did some searching and found out the info i needed. 6.0 block, 4" crank, 4.125 bore.

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    Quote Originally Posted by bene View Post
    I didn't think cubic inch has anything to do w/ the size of a block.
    It has to do with the dia. of the cylinder bore, the stroke of the piston, and the specs of the crank shaft.

    Yes, 7.0 liters is a 427 Big Block engine. Also the size of the engine block does depict big block to small block. the differences are there, you just have to know what you are looking for and at. Yes, you can bore a small blck to big block specs, but the fact is, its still considered a small block bored 'x' amount over to bring it to big block specs.

    396 c.i. displacement and up is considered 'big block', although the 408 and 409's are considered small blocks because those were created with a bored and cranked small block engine

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    Likes twisty roads bene's Avatar
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    Quote Originally Posted by SSwt00SS View Post
    It has to do with the dia. of the cylinder bore, the stroke of the piston, and the specs of the crank shaft.

    Yes, 7.0 liters is a 427 Big Block engine. Also the size of the engine block does depict big block to small block. the differences are there, you just have to know what you are looking for and at. Yes, you can bore a small blck to big block specs, but the fact is, its still considered a small block bored 'x' amount over to bring it to big block specs.

    396 c.i. displacement and up is considered 'big block', although the 408 and 409's are considered small blocks because those were created with a bored and cranked small block engine
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    LoudMouth SStriker's Avatar
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    Quote Originally Posted by SSwt00SS View Post
    It has to do with the dia. of the cylinder bore, the stroke of the piston, and the specs of the crank shaft.

    Yes, 7.0 liters is a 427 Big Block engine. Also the size of the engine block does depict big block to small block. the differences are there, you just have to know what you are looking for and at. Yes, you can bore a small blck to big block specs, but the fact is, its still considered a small block bored 'x' amount over to bring it to big block specs.

    396 c.i. displacement and up is considered 'big block', although the 408 and 409's are considered small blocks because those were created with a bored and cranked small block engine


    I know i am new here but i am going to disagree with you. The LSx Blocks are all small blocks. Cubic inches mean nothing. You can get a Gen 1 style block from world that is 454 cubic inches and still considered a small block. THe exterior of the block dictates its designation between small and big block.



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    Senior Member ninobrn99's Avatar
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    im gonna make some phone calls and find out for sure.

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    Quote Originally Posted by SStriker View Post
    I know i am new here but i am going to disagree with you. The LSx Blocks are all small blocks. Cubic inches mean nothing. You can get a Gen 1 style block from world that is 454 cubic inches and still considered a small block. THe exterior of the block dictates its designation between small and big block.


    my bad if i may have confused. I wasn't implying that the LSx series engines were the focus of my big block/small block analysis. I'm still learning about teh LSx engine so I may be wrong and never mind being corrected. I was referring to the old cast iron blocks from the 60's up to the LT1.

    You are correct the exterior of the block designates a visual small block from a big block. However, in the case of the LSx series I am not sure I have seen a small block-big block if you know what I mean. I just know that a small block can be bored 'x' amount over to make a big block with the correct crank, cylinder bore size, pistons and supporting bottom end. combine that with a deep set of small block heads and yes you now have a big block displacement in a small block configuation.

    anyone please feel free to correct me or share their knowledge w/me.

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    Awaiting Activation Liquifire's Avatar
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    Quote Originally Posted by Street Fighter View Post
    If I had half of that I believe that I could get 500hp with just heads, cam,headers,intake and a good catback setup.
    On pump gas without a power adder and with stock cubes would be very very difficult........I haven't seen it yet.

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