Going from gen IV 5.3 to gen III ls6 5.7
01-29-2012, 02:07 PM
#1
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Going from gen IV 5.3 to gen III ls6 5.7
Anybody done this? I know the knock sensors and cam sensor are relocated I'm gonna swap all that over from my 5.3 correct me if this is not possible. Im only reusing the block and heads from the ls6 because of the reluctor ring difference. i need some advise on the rotating assembly (crank,rods,pistons) stroker or not i want to maintain the 10.5:1 compression. I don't want a drag truck i want more torque and better towing. I also need a cam recommendation i want a stock idle and keep the stock torque convertor. For the heads should i do anything besides a valve job on the 243 heads?
01-31-2012, 09:51 PM
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going from IV 5.3 togen III ls 6
Idk if the knock sensors can be converted back or not, and the cam sensor will be at the rear of the block .
I can tell you this though don't build a stroker. I went with a 383 stroker out of a 5.3 iron block, and a 4" crank in these blocks doesn't work. The piston comes out of the block way too far and you get alot of piston rock. The compression height of the stroker piston is 1.1" and pin is right up there, unstable piston. This leads to premature ring and piston wear, followed by high oil consumption. And a motor that wont live in a daily driver.
There are posts either here or on google from Judson Massengill SAM that states he wouldn't put anything bigger than a 3.75 stroke crank in these motors.
After a summer of hell and about 10K I found this out the hard way. Long story and don't wan't to talk about it.
Now my truck is a 2001, and I built the motor from a 2007-09 block. I had to get ksensors relocation harness from racetronix as well as the camsensor harness.
Just a little info.
I can tell you this though don't build a stroker. I went with a 383 stroker out of a 5.3 iron block, and a 4" crank in these blocks doesn't work. The piston comes out of the block way too far and you get alot of piston rock. The compression height of the stroker piston is 1.1" and pin is right up there, unstable piston. This leads to premature ring and piston wear, followed by high oil consumption. And a motor that wont live in a daily driver.
There are posts either here or on google from Judson Massengill SAM that states he wouldn't put anything bigger than a 3.75 stroke crank in these motors.
After a summer of hell and about 10K I found this out the hard way. Long story and don't wan't to talk about it.
Now my truck is a 2001, and I built the motor from a 2007-09 block. I had to get ksensors relocation harness from racetronix as well as the camsensor harness.
Just a little info.
02-07-2012, 12:53 PM
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Thread bump, as I am also curious as to whether or not an LS1/LS6 block can be used in a NNBS. I'm on the fence about buying an LS1 and converting everything over or just forking over some money for an LY6 shortblock.
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