ls2 c.i. question
12-08-2009, 10:44 PM
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ls2 c.i. question i would like to one day put a modern ls2 motor in my 67 lemans but i wanna make it as close to the old c.i. like the old motors. who sells the rotating assembly that would give me 400,421, or even 455 c.i.? jus something for me to keep in the back of my mind when im ready.
12-09-2009, 02:53 PM
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Lets see...
For a 400 you could go with a LS2 block (4.005" bore) and a 3.97" crank. (that would be a .030" under bore on a 4.00" crank).
LS2 stock bore + 4.00" stroker kit comes in just at 402 to 404 cubes.
For a 421 you could use a LS3 block (4.065" bore) with a 4.055" stroke crank (.055" over on a 4.00 crank or .045" under on a 4.1" crank).
For the 455 look at the LSX 454's builds (4.155" Bore & 4.185" Stroke) and go .010" over on the crank.
You could also get a 389 with the LS7 block (4.125" bore) and a 3.64" crank (.018" over on a stock sized 3.622 LS series crank) or you could use a LS3 block (4.065" bore) and a 3.75" crank. GM went with the LS7 block in the Air 6 2004 GTO show car.
For the 3.622", 4.00", and 4.1" cranks look at Eagle, Callies, Lunati, Compstar, and others.
Callies is the only one offering a 3.75" crank for the LS engines that I have heard of (its under there magnum line and is not cheap).
Cubic Inch Calculator in web form: http://www.mindsciencemotorsports.com/graphics/tech.htm
For a 400 you could go with a LS2 block (4.005" bore) and a 3.97" crank. (that would be a .030" under bore on a 4.00" crank).
LS2 stock bore + 4.00" stroker kit comes in just at 402 to 404 cubes.
For a 421 you could use a LS3 block (4.065" bore) with a 4.055" stroke crank (.055" over on a 4.00 crank or .045" under on a 4.1" crank).
For the 455 look at the LSX 454's builds (4.155" Bore & 4.185" Stroke) and go .010" over on the crank.
You could also get a 389 with the LS7 block (4.125" bore) and a 3.64" crank (.018" over on a stock sized 3.622 LS series crank) or you could use a LS3 block (4.065" bore) and a 3.75" crank. GM went with the LS7 block in the Air 6 2004 GTO show car.
For the 3.622", 4.00", and 4.1" cranks look at Eagle, Callies, Lunati, Compstar, and others.
Callies is the only one offering a 3.75" crank for the LS engines that I have heard of (its under there magnum line and is not cheap).
Cubic Inch Calculator in web form: http://www.mindsciencemotorsports.com/graphics/tech.htm
