454 LSX Build Drag Racing
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I can tell you i plan on making 1000whp with the std deck lsx 427 with twins at around 15psi talk with some of the big builders they will steer in the right direction. You really dont need a tall deck for your goals just added cost for othe parts to go with the tall decks.
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Lunati Signature Series Rotating Assemblies Lunati 44103SRK 441 C.I. LS
Stroke: 4.125"
Bore: 4.125"
Rod Length: 6.125"
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Lunati 45403SRK 454 C.I. LS
Stroke: 4.250"
Bore: 4.125"
Rod Length: 6.300"
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Lunati 42803SRK 428 C.I. LS
Stroke: 4.000"
Bore: 4.125"
Rod Length: 6.125"
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Lunati 41253SRK02 429 C.I. LS
Stroke: 4.125"
Bore: 4.070"
Rod Length: 6.125"
Stroke: 4.125"
Bore: 4.125"
Rod Length: 6.125"
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Lunati 45403SRK 454 C.I. LS
Stroke: 4.250"
Bore: 4.125"
Rod Length: 6.300"
______________________________
Lunati 42803SRK 428 C.I. LS
Stroke: 4.000"
Bore: 4.125"
Rod Length: 6.125"
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Lunati 41253SRK02 429 C.I. LS
Stroke: 4.125"
Bore: 4.070"
Rod Length: 6.125"
Launching!
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From: Alberta, Canada
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From: Dubai
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From: Gilbert, AZ
Longer stroke just gives you piston support issues. I wouldn't do past a 4" stroke on a std LSX block for high HP.
Mine is a 4.125x4. On 18.5 psi, soft tune, 91+meth I made 1047rwhp/922rwtq last week. 21-22psi and 1100+ would have been easy. Keep some cylinder wall and keep the stroke reasonable and let the blower/turbos do the work.
Mine is a 4.125x4. On 18.5 psi, soft tune, 91+meth I made 1047rwhp/922rwtq last week. 21-22psi and 1100+ would have been easy. Keep some cylinder wall and keep the stroke reasonable and let the blower/turbos do the work.
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Longer stroke just gives you piston support issues. I wouldn't do past a 4" stroke on a std LSX block for high HP.
Mine is a 4.125x4. On 18.5 psi, soft tune, 91+meth I made 1047rwhp/922rwtq last week. 21-22psi and 1100+ would have been easy. Keep some cylinder wall and keep the stroke reasonable and let the blower/turbos do the work.
Mine is a 4.125x4. On 18.5 psi, soft tune, 91+meth I made 1047rwhp/922rwtq last week. 21-22psi and 1100+ would have been easy. Keep some cylinder wall and keep the stroke reasonable and let the blower/turbos do the work.
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From: Gilbert, AZ
You will get a more reliable motor with a better piston. I see no reason to run past a 4" stroke for what you want. Even if you wanted 1500hp I wouldn't sacrifice piston stability for a little stroke.
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lets assume on two similar blown motors a 427 and a 440 both limited by pump gas which for the sake of the argument means that in both motors you cant run more than 16psi of boost before detonation kicks in, you end up making more power with the 440ci engine, so you cant say there is "no reason" to run a longer stroke, if there was no reason id run a 1 inch stroke, yet its more of an educated sacrifice
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I disagree. Cylinder pressure will limit the max power. The 440 may make more low end but the heads/intake/blower/fuel will limit the power up top. I don't think think the .125" stroke which does make a big difference in piston support, ring lands, etc is worth it for a street motor. Race only that is going to get pulled apart ever 50 runs, sure, go ahead.
Sounds like he has his mind made up to be honest. They are soo many big shops and engine builders that would advise against anything more then a 4.0 stroke on a boost application due to pulling the piston out of sleeve soo far.
I am not really sure how times someone has to say this in this thread!!
I am not really sure how times someone has to say this in this thread!!
Same reason why I went with a 370 when building my engine. My car is driven on the street and I dont plan on rebuilding it anytime soon.
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From: Dubai
I disagree. Cylinder pressure will limit the max power. The 440 may make more low end but the heads/intake/blower/fuel will limit the power up top. I don't think think the .125" stroke which does make a big difference in piston support, ring lands, etc is worth it for a street motor. Race only that is going to get pulled apart ever 50 runs, sure, go ahead.
lets assume on two similar blown motors a 427 and a 440 both limited by pump gas which for the sake of the argument means that in both motors you cant run more than 16psi of boost before detonation kicks in, you end up making more power with the 440ci engine, so you cant say there is "no reason" to run a longer stroke, if there was no reason id run a 1 inch stroke, yet its more of an educated sacrifice
I disagree. Cylinder pressure will limit the max power. The 440 may make more low end but the heads/intake/blower/fuel will limit the power up top. I don't think think the .125" stroke which does make a big difference in piston support, ring lands, etc is worth it for a street motor. Race only that is going to get pulled apart ever 50 runs, sure, go ahead.
You can get a plenty good piston with a 4" stroke. I believe the lsx blocks use a longer cylinder than the 6.0 stuff. If I'm wrong please correct me.