408 L92 power estimates
08-05-2007, 09:56 PM
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408 L92 power estimates I am currently building an iron 408 and have seen #s anywhere from 430hp to 540hp and was just wanting some guestimates on my setup.
Iron 408
Eagle 4.000" crank, 6.125" H-beam rods, Mahle -12cc pistons
L92 heads ( with minor port work) milled .030
Livernois Stage 3 L92 cam 242 248 610 618 114LSA
Through an M6 and 3:42s
Iron 408
Eagle 4.000" crank, 6.125" H-beam rods, Mahle -12cc pistons
L92 heads ( with minor port work) milled .030
Livernois Stage 3 L92 cam 242 248 610 618 114LSA
Through an M6 and 3:42s
08-06-2007, 01:28 AM
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Originally Posted by bandit1
An Y no guess for me fraser Im still wantin some guesses darnit haha I am gunna say 480
Gave you a guess on yours! Both of you guys cams may need more exhaust duration. We'll see what happens. L92's are still causing headaches. They don't want to follow the rules.
08-08-2007, 09:03 AM
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guess I'll guess 490rwhp. Keep us posted on what you get. I am running the exact same cam in my 413 LS2 L92 setup. I should have results on Saturday when the car goes in for a full dyno tune.
08-08-2007, 12:25 PM
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It depends on the dyno, but I know livernois made almost 520 RWHP on a 404 w/ their ported L92 heads, and a WAY smaller cam then that (i will see if I can get anyone to give me the specs). I guess only time will tell.
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08-08-2007, 10:00 PM
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Thanks for the input guys. I am really wanting the CR at about 11:1 but i am afraid of taking more off of the heads or shortening the deck height and then running into PTV clearence issues. shorter head gaskets, different pistons? any suggestions as to how i could bring the CR up because i know 10.5:1 is a little low.
08-08-2007, 10:32 PM
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Originally Posted by LS1TA385
I am currently building an iron 408 and have seen #s anywhere from 430hp to 540hp and was just wanting some guestimates on my setup.
Iron 408
Eagle 4.000" crank, 6.125" H-beam rods, Mahle -12cc pistons
L92 heads ( with minor port work) milled .030
Livernois Stage 3 L92 cam 242 248 610 618 114LSA
Through an M6 and 3:42s
Iron 408
Eagle 4.000" crank, 6.125" H-beam rods, Mahle -12cc pistons
L92 heads ( with minor port work) milled .030
Livernois Stage 3 L92 cam 242 248 610 618 114LSA
Through an M6 and 3:42s
if you have full exhaust, Fast 90 tb90, and 408 motor, L92 heads, M6 and tuned, I say 510+ rwhp...
also I'd want the CR to be lower than 11:1 in case you wanna do s/c later on... keep that below 10.5 or even 10 if you can, that way you can safely do at least 6-7# on the s/c.
08-11-2007, 06:23 AM
#12
Originally Posted by DjValy
I say 470rwhp with just what you listed.
if you have full exhaust, Fast 90 tb90, and 408 motor, L92 heads, M6 and tuned, I say 510+ rwhp...
also I'd want the CR to be lower than 11:1 in case you wanna do s/c later on... keep that below 10.5 or even 10 if you can, that way you can safely do at least 6-7# on the s/c.
if you have full exhaust, Fast 90 tb90, and 408 motor, L92 heads, M6 and tuned, I say 510+ rwhp...
also I'd want the CR to be lower than 11:1 in case you wanna do s/c later on... keep that below 10.5 or even 10 if you can, that way you can safely do at least 6-7# on the s/c.
08-11-2007, 08:44 AM
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I know livernois is going to be testing a modified ls7 intake soon to see what kind of improvements can be had over the l76 intake. They also are working with FAST to get a manifold developed
08-12-2007, 12:20 PM
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I'm a little disappointed
Originally Posted by SSilverSSurfer
theres a guy here in town with a 408 l92 set up. and all can say is i was very very very disappointed
451 RWHP/414 RWTQ. I was hoping for about 460-480 RWTQ, but I'm still working on it. I'd love to see a better intake.
Bob K.
08-12-2007, 05:22 PM
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Yeah i have full boltons including pulley, 90mm TB, and full exhaust with 3.42 gears. I am afraid that my 1 3/4" headers are going to hurt the power a little but i guess we'll find out whenever i get together.