500+hp 383?
01-11-2006, 05:02 PM
#2
!LS1 11 Second Club
Originally Posted by Boss man
Just want to know how much hp I can squeeze out of a fully built 383 ls1 with quality parts on pump gas.
Crank, stock cube 346 LS1's pass 500 all the time. My ol' setup is running around with about 560something hp (480rwhp).
01-11-2006, 05:08 PM
#3
!LS1 11 Second Club
383's are good for bringing Tq numbers close to Hp numbers.
480rwhp/465rwtq for example. (just throwing out numbers)
A similar LS1 setup will not come anywhere near those tq values.
These days, going with a 402 or 408 is a much better buy. You get the entire shortblock, ready to go.
http://www.texas-speed.com/shop/item...mid=43&catid=3
480rwhp/465rwtq for example. (just throwing out numbers)
A similar LS1 setup will not come anywhere near those tq values.
These days, going with a 402 or 408 is a much better buy. You get the entire shortblock, ready to go.
http://www.texas-speed.com/shop/item...mid=43&catid=3
01-11-2006, 09:03 PM
#6
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It is absolutely possible to acheive 500+ RWHP out of a 383. The key is the head and cam selection. You have to have a damn good set of heads and a hefty cam though.
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01-12-2006, 12:50 PM
#8
As others have mentioned, no problem assuming a good combination with an emphasis placed on good cylinder heads....the better the heads the less cam you need to hit your goals.
Here is a lengthy thread I started a few months back covering all my dyno test results with a 383 I just completed and will hopefully soon have running in my C5...
https://ls1tech.com/forums/dynamometer-results-comparisons/384450-383-engine-dyno-results-graphs-included.html
For a 6 speed car I would knock about 80 HP off the flywheel numbers to give you an idea of where you might be at the rear wheels. BTW, none of the cams featured in this test were large by todays standards....even the solid roller is fairly tame with good idle characteristics....dont forget that a solid roller looks bigger on paper and really acts like a hydraulic cam some 6-8 degrees smaller (due to having to take up the lash in the valvetrain). Obviously even more power would have been available with more cam timing but I wasn't willing to sacrifice drivability and low RPM torque which would have been inevidable with more cam timing. I'm hoping my Vette puts down somewhere in the 520-525 RWHP range with the last combination featured (the solid roller version), a stout number for a very "street friendly" package with that displacement.
The thread is quite long BTW....hope you have a few hours to kill
Tony M.
Here is a lengthy thread I started a few months back covering all my dyno test results with a 383 I just completed and will hopefully soon have running in my C5...
https://ls1tech.com/forums/dynamometer-results-comparisons/384450-383-engine-dyno-results-graphs-included.html
For a 6 speed car I would knock about 80 HP off the flywheel numbers to give you an idea of where you might be at the rear wheels. BTW, none of the cams featured in this test were large by todays standards....even the solid roller is fairly tame with good idle characteristics....dont forget that a solid roller looks bigger on paper and really acts like a hydraulic cam some 6-8 degrees smaller (due to having to take up the lash in the valvetrain). Obviously even more power would have been available with more cam timing but I wasn't willing to sacrifice drivability and low RPM torque which would have been inevidable with more cam timing. I'm hoping my Vette puts down somewhere in the 520-525 RWHP range with the last combination featured (the solid roller version), a stout number for a very "street friendly" package with that displacement.
The thread is quite long BTW....hope you have a few hours to kill
Tony M.
Last edited by Tony Mamo @ AFR; 01-12-2006 at 01:00 PM.
