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question about building ls7

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Old Dec 11, 2007 | 08:13 PM
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Default question about building ls7

Hey guys im going to be building an ls7 for a project that i have ,and i have a few questions considering this will be the first time im building an ls based engine, and i figured this was the best place to ask them so here we go. i want to make about 550 horsepower.


1. Can i use a iron 6.0 block.
2.Can i use a factory ls7 crankshaft in the 6.0 block.
3.Can i use a th400 or do i have to use and 4l60e or similar
4.Can a 6.0 block take a 6.125 rod.

thats pretty much it for right now i know that i will have more questions. thanks
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Old Dec 14, 2007 | 04:34 PM
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1.the new lsx block would be your best choice
2. don't know, but I would run a forged crank
3. yes you can run a th400 or 4l60e
4. yes.

Search is your friend, do you have a new rear and suspension for it?
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Old Dec 16, 2007 | 10:16 PM
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Default thanks for the respense

That definantly answers my questions the motor is going into a 70 chevrolet truck and is has full air ride suspension and built 12 bolt so i think the rear should hold up thanks for being the only one to answer my questions.
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Old Dec 17, 2007 | 06:49 AM
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hey no problem.

You may also want to look into the 4L80E tranny- it is pretty much a Th-400 with overdrive.
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Old Dec 17, 2007 | 11:54 AM
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Default thats an option

i have checked into the 4l80e but i already have a built turbo 400 that i had left over so i am still kinda up in the air on that but im considering it for sure just for the drivability.thanks again
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