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Post Mix-up for LS6 more than 430 RWHP Without Heads

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Old 12-18-2007, 01:16 AM
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Default Post Mix-up for LS6 more than 430 RWHP Without Heads

hi guys
please post here Mix-up let me more than 430 RWHP without Heads For LS6 Engine
thanks.
Old 12-18-2007, 08:40 AM
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from kuwait...so i'm guessing english is not great. so i'll try to help.


by mix-up i think you mean "build up"....for 430rwhp without doing heads.

that's not easy...but not impossible either.

you say its an ls6...i assume with ls6 heads (243s), which will help. you'll need a decent cam and all the bolt ons. something like the futral F15, TSP ms4, or the TR t-rex.

and to make sure you got full potential, i would budget in a FAST 90/90 on top.
should get you to your goal on stock heads...or pretty damn close
Old 12-18-2007, 12:20 PM
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there is a guy, screen name 418redz28, who has 243 heads and a 232/234 camshaft with an LS6 intake that is making 430rwhp.

Im doing similar. Take to Patrick G, he'll set you up right!!

I would also recommend bumping your compression up a little with a .040 head gasket but unless you aren't planning on taking your heads off it might not be worth it.

teke184's advice will get you there and then some!! trex, 90/90, and 243 heads might get you 450+ (just a guess)
Old 12-18-2007, 03:37 PM
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Well I'm also not exactly sure what the OP was asking, however, I have an LS6 CTS-V. Currently I have 380 rwhp with most of the boltons (kooks 1.75 headers, high flow cats, 2.5" duals, Lingenfleter CAI, smooth intake tube, Mamo Ported Fast 90, NW 90 mm TB & a dyno tune), on a mustang dyno [ https://ls1tech.com/forums/dynamometer-results-comparisons/822519-stock-head-cam-346-ls6-w-bolton-s-pre-post-fast-90-90-results.html ]. I had Patrick G spec me out a cam (224/228 .598/.619 111 XFI/XER). he guestimate between 40-50 rwhp, so I hope to be somewhere between 410 - 430 rwhp with just a cam, and stock 243 heads. I'm sure I could get higher if I went with an MS4 or TREX. I plan to add an Underdrive pulley when I put the cam on as well.

-Chris

Last edited by trukk; 12-18-2007 at 03:57 PM.
Old 12-18-2007, 04:12 PM
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A 228 XE-R lobe isn't .619 lift. That sounds more like a marine lobe I think.
Old 12-18-2007, 07:25 PM
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Originally Posted by trukk
Well I'm also not exactly sure what the OP was asking, however, I have an LS6 CTS-V. Currently I have 380 rwhp with most of the boltons (kooks 1.75 headers, high flow cats, 2.5" duals, Lingenfleter CAI, smooth intake tube, Mamo Ported Fast 90, NW 90 mm TB & a dyno tune), on a mustang dyno [ https://ls1tech.com/forums/showthread.php?t=822519 ]. I had Patrick G spec me out a cam (224/228 .598/.619 111 XFI/XER). he guestimate between 40-50 rwhp, so I hope to be somewhere between 410 - 430 rwhp with just a cam, and stock 243 heads. I'm sure I could get higher if I went with an MS4 or TREX. I plan to add an Underdrive pulley when I put the cam on as well.

-Chris
Originally Posted by N4cer
A 228 XE-R lobe isn't .619 lift. That sounds more like a marine lobe I think.
I was doing it from memory and flubbed. At home now and looked at the build sheet:

3015 .609 XFI intake
3724 .588 XE-R Exhaust
111 LSA

Good eye, and good catch. Thanks for keeping me honest, and keeping the info legit.

-Chris
Old 12-19-2007, 01:23 AM
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Originally Posted by teke184
from kuwait...so i'm guessing english is not great. so i'll try to help.


by mix-up i think you mean "build up"....for 430rwhp without doing heads.

that's not easy...but not impossible either.

you say its an ls6...i assume with ls6 heads (243s), which will help. you'll need a decent cam and all the bolt ons. something like the futral F15, TSP ms4, or the TR t-rex.

and to make sure you got full potential, i would budget in a FAST 90/90 on top.
should get you to your goal on stock heads...or pretty damn close

thank u for helping , what is the best for me the MS4 or G5X3 , note i milled the heads 030
Old 12-19-2007, 01:42 AM
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Originally Posted by PONTIAC SLP
thank u for helping , what is the best for me the MS4 or G5X3 , note i milled the heads 030


both are excellent choice of cam. I am a bit biased as I have the MS4 in my car, and I love it. I've seen plenty of people with stock 243 cast ls6 heads and this cam put down 430-440 on a dynojet so it is very possible with untouched heads. Just keep in mind that with any big cam, you will need to upgrade to better springs. All in all, you can't go wrong with either cam.
Old 12-19-2007, 04:19 AM
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Originally Posted by xtremejimmy
both are excellent choice of cam. I am a bit biased as I have the MS4 in my car, and I love it. I've seen plenty of people with stock 243 cast ls6 heads and this cam put down 430-440 on a dynojet so it is very possible with untouched heads. Just keep in mind that with any big cam, you will need to upgrade to better springs. All in all, you can't go wrong with either cam.
Before i put the MS4 see my Sig with 241 stock heads , i tested the MS4 its good cam but some people said the G5X3 the best than MS4
Old 12-19-2007, 05:24 AM
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Originally Posted by PONTIAC SLP
thank u for helping , what is the best for me the MS4 or G5X3 , note i milled the heads 030
you'll need to flycut the pistons with either cam if you milled.

Your choices now are limited without flycuting
Old 12-19-2007, 06:55 AM
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Originally Posted by PREDATOR-Z
you'll need to flycut the pistons with either cam if you milled.

Your choices now are limited without flycuting
what should i do, what is the appropriate cam ?
Old 12-19-2007, 10:41 AM
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sorry, I thought you had the 243 heads. I cant think of any cam that can make 430 whp with the stock untouched 241 cast heads. I think the only way you will see those numbers is with the 243 heads or some aftermarket better heads (i.e.- AFR, trickflow, ETP, etc...)
Old 12-19-2007, 03:00 PM
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Originally Posted by xtremejimmy
sorry, I thought you had the 243 heads. I cant think of any cam that can make 430 whp with the stock untouched 241 cast heads. I think the only way you will see those numbers is with the 243 heads or some aftermarket better heads (i.e.- AFR, trickflow, ETP, etc...)
no no i mean before i sell the LS1 Engine , now i have the LS6 my heads now 243 i milled them 030 , and i want the appropriate cam did u understand me now
Old 12-19-2007, 03:22 PM
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Originally Posted by PONTIAC SLP
no no i mean before i sell the LS1 Engine , now i have the LS6 my heads now 243 i milled them 030 , and i want the appropriate cam did u understand me now
in that case, than yes, you will definately make 430-440 whp on a dynojet with that cam (MS4) and heads (243) setup. With a ported FAST 90/90 setup, you can be 460-475 whp fairly easily with some good tuning. Good luck!
Old 12-19-2007, 07:35 PM
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475 horse from unported 243 heads? I doubt it... he should try out the vindicator cam from Vengeance.
Old 12-20-2007, 12:49 AM
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None of these cams will fit. Flycutting is now mandatory for any big cam. Flycuting is cutting eyebrows (reliefs) in the piston so valves don't smack them.
Being in Kuwait that is not easy to do, my advice, get some ported heads and match a cam.

As you sit now, 224 size cam might all you can fit underneath. That will not get you 430 but 400 is achievable.

I would say (if indeed .030 was cut) a 224/224 .609/.581 114+4 LSA would do the job with bolt ons.
Old 12-20-2007, 01:04 AM
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Originally Posted by xtremejimmy
in that case, than yes, you will definately make 430-440 whp on a dynojet with that cam (MS4) and heads (243) setup. With a ported FAST 90/90 setup, you can be 460-475 whp fairly easily with some good tuning. Good luck!
now we all know the
LS1 heads 241 66 cc
LS6 heads 243 64 cc
if i mill the LS6 030 how much will be ? because some one said ( if the cam is too big, then you'll run a valve into the piston ) can i put MS4 ?
Old 12-20-2007, 05:40 AM
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64cc -5cc = 59cc
There is no way you'll fit a MS4 or similar cam in there. each .005/.006 mill = 1 cc

Read post # 16

Last edited by PREDATOR-Z; 12-21-2007 at 06:30 AM.
Old 12-20-2007, 03:12 PM
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Just flycut your pistons and go with a big cam. I did, no regrets here.
Old 12-20-2007, 11:41 PM
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Originally Posted by PREDATOR-Z
64cc -5cc = 59cc
There is no way you'll fit a MS4 or similar cam in there. each .005 mill = 1 cc
if .005 = 1cc then:

.030 / .005 = 6cc

64cc - 6cc = 58cc chambers, meaning even less room for the valves...

...just tryin to help...



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