Which motor should I build?
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From: Chicago - Southside
Which motor should I build? Hey everyone..I have two different ideas for a motor I'd like to build by next year. I've done almost everything on my car so far, so building a motor myself is my goal, so i can expand my knowledge and if all goes right, haul some more ***. I've come up with two options. Here they are:
1.) Aluminum 370 (3.622" x 4.03")
This would be built from an LS2 block, bored .030" over. Stock crank, forged rods/pistons, higher (11.5:1-ish) compression, most likely ported LS6 heads/LS6 or Performance Products Typhoon intake, maybe even a L92 setup, depending on what options are available, I still have to spec out the cam, but I'm thinking something around the size of a G5X3/X4. My goal with this is to have a lightweight, high RPM, mostly street motor, every bolt-on. I want to try (yes, the key word is try) to break 500rwhp with this. I think it'd be a nice spray motor, and pretty fun on the highway.
2.) Iron 421/427 (4.125" x 4.03"/4.06")
This would be built using an LQ4/LQ9 iron block, bored .030"/.060" over. 4.125" forged crank, forged rods/pistons, 11.0:1-ish compression, most likely hand-finished AFR's or ET's/Typhoon or FAST, if not some type of L92/LS7 heads/intake or even a sheetmetal intake. As for a cam, I'm thinking 24X/25X, maybe with LSK lobes. My goal with this is to make a lot of power, broad powerband, and have a strong, streetable motor capable of some pretty impressive N/A performance. More expensive, but more potential.
Which would you do? I'd probably spray on top of either one. All input is welcome.
Adam
1.) Aluminum 370 (3.622" x 4.03")
This would be built from an LS2 block, bored .030" over. Stock crank, forged rods/pistons, higher (11.5:1-ish) compression, most likely ported LS6 heads/LS6 or Performance Products Typhoon intake, maybe even a L92 setup, depending on what options are available, I still have to spec out the cam, but I'm thinking something around the size of a G5X3/X4. My goal with this is to have a lightweight, high RPM, mostly street motor, every bolt-on. I want to try (yes, the key word is try) to break 500rwhp with this. I think it'd be a nice spray motor, and pretty fun on the highway.
2.) Iron 421/427 (4.125" x 4.03"/4.06")
This would be built using an LQ4/LQ9 iron block, bored .030"/.060" over. 4.125" forged crank, forged rods/pistons, 11.0:1-ish compression, most likely hand-finished AFR's or ET's/Typhoon or FAST, if not some type of L92/LS7 heads/intake or even a sheetmetal intake. As for a cam, I'm thinking 24X/25X, maybe with LSK lobes. My goal with this is to make a lot of power, broad powerband, and have a strong, streetable motor capable of some pretty impressive N/A performance. More expensive, but more potential.
Which would you do? I'd probably spray on top of either one. All input is welcome.
Adam
Staging Lane
Joined: Jun 2004
Posts: 85
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From: Amarillo,TX
If money is no object than i would go with the second choice bored .030. But if you were wanting to do more of a street/budget build than the ls2, stock stroke setup would be a good choice too just dont bore it .030 b/c the sleeves are too thin to increase the size that much. I think .005 oversize is what most do.
Depends on the money situation. Budget, go for 1, big bank hank, go for 2.
4.125 crank will cost you $2k right off the bat, however you could opt for a 4.100 Eagle and be in the $800 range. 
4.125 crank will cost you $2k right off the bat, however you could opt for a 4.100 Eagle and be in the $800 range. Trending Topics
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Originally Posted by 8banger
Hey everyone..I have two different ideas for a motor I'd like to build by next year. I've done almost everything on my car so far, so building a motor myself is my goal, so i can expand my knowledge and if all goes right, haul some more ***. I've come up with two options. Here they are:
1.) Aluminum 370 (3.622" x 4.03")
This would be built from an LS2 block, bored .030" over. Stock crank, forged rods/pistons, higher (11.5:1-ish) compression, most likely ported LS6 heads/LS6 or Performance Products Typhoon intake, maybe even a L92 setup, depending on what options are available, I still have to spec out the cam, but I'm thinking something around the size of a G5X3/X4. My goal with this is to have a lightweight, high RPM, mostly street motor, every bolt-on. I want to try (yes, the key word is try) to break 500rwhp with this. I think it'd be a nice spray motor, and pretty fun on the highway.
2.) Iron 421/427 (4.125" x 4.03"/4.06")
This would be built using an LQ4/LQ9 iron block, bored .030"/.060" over. 4.125" forged crank, forged rods/pistons, 11.0:1-ish compression, most likely hand-finished AFR's or ET's/Typhoon or FAST, if not some type of L92/LS7 heads/intake or even a sheetmetal intake. As for a cam, I'm thinking 24X/25X, maybe with LSK lobes. My goal with this is to make a lot of power, broad powerband, and have a strong, streetable motor capable of some pretty impressive N/A performance. More expensive, but more potential.
Which would you do? I'd probably spray on top of either one. All input is welcome.
Adam
1.) Aluminum 370 (3.622" x 4.03")
This would be built from an LS2 block, bored .030" over. Stock crank, forged rods/pistons, higher (11.5:1-ish) compression, most likely ported LS6 heads/LS6 or Performance Products Typhoon intake, maybe even a L92 setup, depending on what options are available, I still have to spec out the cam, but I'm thinking something around the size of a G5X3/X4. My goal with this is to have a lightweight, high RPM, mostly street motor, every bolt-on. I want to try (yes, the key word is try) to break 500rwhp with this. I think it'd be a nice spray motor, and pretty fun on the highway.
2.) Iron 421/427 (4.125" x 4.03"/4.06")
This would be built using an LQ4/LQ9 iron block, bored .030"/.060" over. 4.125" forged crank, forged rods/pistons, 11.0:1-ish compression, most likely hand-finished AFR's or ET's/Typhoon or FAST, if not some type of L92/LS7 heads/intake or even a sheetmetal intake. As for a cam, I'm thinking 24X/25X, maybe with LSK lobes. My goal with this is to make a lot of power, broad powerband, and have a strong, streetable motor capable of some pretty impressive N/A performance. More expensive, but more potential.
Which would you do? I'd probably spray on top of either one. All input is welcome.
Adam
1.)Typically, an oversquare motor (bore>stroke) will make it's torque higher in the RPM range. More torque at a higher RPM will produce more horsepower as long as you have enough air (and a stable valvetrain $$$) to support it. It would probaby be better to use the LS7/L92 heads on this motor. Problem here is that you'll have to turn it higher, which you really don't wanna do on a street setup.
2.)No replacement for displacement. This will make power at lower RPM so exotic valvetrain isn't as necessary. Definately a better street car setup.