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Generation III Internal Engine 1997-2006 LS1 | LS6
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408ci build, expectations/suggestion.......

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Old Apr 16, 2012 | 01:31 PM
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with that combo and an M6, i would be more worried about the 12bolt. if you didnt already buy it i would consider a 9" over the 12 bolt. the 6 speeds in cammed LS1's are known for breaking 12 bolts. i would not want one behind a head and cammed 408 going through a 6 speed. but that is just my opinion.
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Old Apr 19, 2012 | 12:25 AM
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I'm doing a similar conversion going from a 370 to a 408. I have the tfs 215, but wonder is that the best head for a 408. I also have the Fast 102, etc and 1 17/8 headers. What are your opinions on these heads.
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Old Apr 19, 2012 | 10:16 AM
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Originally Posted by trans_am7935
with that combo and an M6, i would be more worried about the 12bolt. if you didnt already buy it i would consider a 9" over the 12 bolt. the 6 speeds in cammed LS1's are known for breaking 12 bolts. i would not want one behind a head and cammed 408 going through a 6 speed. but that is just my opinion.
I havent had any issues with mine... been in there for 3.5 years now. Not saying th 9inch isnt better, because it is by a long shot, but my moser is doing fine!!! lol
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Old Apr 19, 2012 | 01:03 PM
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Haven't drove it yet with the new rear, but I went with a Ford 9" and 4.56 gears...I can't wait!
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Old Apr 19, 2012 | 01:09 PM
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Originally Posted by Chris@Tick
I havent had any issues with mine... been in there for 3.5 years now. Not saying th 9inch isnt better, because it is by a long shot, but my moser is doing fine!!! lol
not saying anything bad about the 12 bolt, if i found one cheap i would take it, but for brand new, and the same price, i would go 9 inch.
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Old Apr 19, 2012 | 02:54 PM
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Originally Posted by trans_am7935
not saying anything bad about the 12 bolt, if i found one cheap i would take it, but for brand new, and the same price, i would go 9 inch.
Oh yea for sure!!
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Old Apr 21, 2012 | 04:34 PM
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If it hits 490 I'll be tickled pink thank you for putting this up and thanks everyone for ur input!
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Old Apr 21, 2012 | 06:07 PM
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The only other question that I have is wat type of spark plugs to use of should say how hot to use. I'll post the dyno sheet on this thread to show what it makes! Thank you again
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Old Apr 21, 2012 | 11:04 PM
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I run and recomend the plain old cheap Autolite 103's, they are one step cooler than stock
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Old May 17, 2012 | 06:31 PM
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Dyno Results are in.....


Tuned By DynoSport in Lincoln, (Im just reviewing the logs)

Any suggestions:
(23* on best pull, 444whp was with 28* Timing)

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Old May 17, 2012 | 09:17 PM
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Seems a bit low, but could just be a stinggie dyno.....take her to the track and get the real numbers!
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Old May 17, 2012 | 09:20 PM
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the forged 347 in my sig dynoed on there. 463/416
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Old May 17, 2012 | 09:26 PM
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You peak looks really low, but that curve is beautiful
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Old May 17, 2012 | 09:28 PM
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Originally Posted by mark21742
You peak looks really low, but that curve is beautiful
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Old May 17, 2012 | 09:31 PM
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What was the MAP reading through the run?
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Old May 17, 2012 | 09:39 PM
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92kpa
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Old May 17, 2012 | 09:57 PM
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Originally Posted by 06X6spdGTO
92kpa
Well that seems to be one of the problems. You got a restriction somewhere. Since you're running a 90/90 I doubt it's the intake/TB. Maybe look towards a bigger maf than 85mm and check to see what the outlet is on the twin intake.
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Old May 17, 2012 | 10:04 PM
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Originally Posted by black00ssFL
Well that seems to be one of the problems. You got a restriction somewhere. Since you're running a 90/90 I doubt it's the intake/TB. Maybe look towards a bigger maf than 85mm and check to see what the outlet is on the twin intake.
What should it be?? Stock MAP pegs at 105KPA
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Old May 17, 2012 | 10:06 PM
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My Personal H/C/I Z06 is at 92-95KPA, Friends FAST 102, 100mm MAF, FTP 104 Lid, PRC 227 heads, VX.4 Cam LS1 is at 92-94KPA. When my GTO was Magnuson blower only it was 98 to 100KPA!
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Old May 17, 2012 | 11:05 PM
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Well I was under the impression that it should read 100kpa (no vacuum). I always thought that if you were creating a vacuum of any kind at WOT, it meant your plenum area was not filling fast enough to keep up with the engine demand. I could be wrong though.
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