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What heads for a N/A 408ci?

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Old Jun 14, 2021 | 05:32 PM
  #141  
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Originally Posted by Mavn
Re bumping this comment after ive driven and raced the car for a week and its a torque monster at 4000 rpm . Makes power to 7000 and falls to 6000 on the 7200 rpm shift right in the meat of the power band . So maybe its just my combo of parts working together good. But this is way false for this combo anyway .
Glad you like it, personally I’d expect more out of a donkey dick 400+ ci combo. Thats barely more than what a 376 makes with a milder cam.


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Old Jun 14, 2021 | 05:47 PM
  #142  
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Originally Posted by SLOW SEDAN
Glad you like it, personally I’d expect more out of a donkey dick 400+ ci combo. Thats barely more than what a 376 makes with a milder cam.
Wonder what the ET Differences would be that's the Major question.
Dyno's just a tool, besides that that Cam isn't Really that Big using a 4 inch Crank.
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Old Jun 14, 2021 | 05:52 PM
  #143  
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Donkey Cam 🤣😂

Only in Ls1tech world. Where others Tell u what's Best for your own Ride and Budget.

​​​​​​That 408 is a 5.80's engine in a Mustang BTW.
376 ls3 with less has done it ...no 8k+ rpm needed also has below 12.0 Comp & Hydraulic roller (Now Get this the cam Was 236'ish maybe 238 with a Stock Crank.) 6.0 and the same top end ran 5.90's @ 2800+lbs

Using, can we all say it Together: Factory Ls3 heads With No Real port work Done.
🤣😂

Last edited by Corona; Jun 14, 2021 at 06:01 PM.
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Old Jun 14, 2021 | 06:55 PM
  #144  
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Not to Shoot a Dead horse...but. What I said Holds true...

Bill has 12.2 Comp and a Ls3.....Mavn you beat his rwhp numbers 😉 Bill made right @ 500 rwhp. You made More and you like how it drives 👍... His peak was 7500 🤫. His Car just was light....You've got Tq.......Your engine in that car geared to match Would be just as Fast if Not Faster.



https://www.yellowbullet.com/threads...#post-71598953


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Old Jun 14, 2021 | 08:06 PM
  #145  
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Originally Posted by SLOW SEDAN
Glad you like it, personally I’d expect more out of a donkey dick 400+ ci combo. Thats barely more than what a 376 makes with a milder cam.
Find me a 376 that makes 500 with non ported stock heads thru a stalled auto with any size cam . Because i havent seen it ..ever .. lol
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Old Jun 14, 2021 | 09:58 PM
  #146  
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Originally Posted by Mavn
Find me a 376 that makes 500 with non ported stock heads thru a stalled auto with any size cam . Because i havent seen it ..ever .. lol
I did say slightly more, but a LS3/525 stock combo has gone 9’s so at least get that done with all the extra power.
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Old Jun 14, 2021 | 10:28 PM
  #147  
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Lol a 525 makes 450whp through a manual.
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Old Jun 15, 2021 | 02:18 AM
  #148  
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Originally Posted by spanks13
Lol a 525 makes 450whp through a manual.
400 rwhp thru a Auto with a Nine second pass 🤔@ What Weight? 🤣 2450 - 2500lbs and Dailed in.

Hold the presses no need for larger combinations 525 Ls3 covers all bases.

Last edited by Corona; Jun 15, 2021 at 02:33 AM.
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Old Jun 15, 2021 | 02:40 AM
  #149  
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Originally Posted by SLOW SEDAN
I did say slightly more, but a LS3/525 stock combo has gone 9’s so at least get that done with all the extra power.
An n/a sbe ls3 has been 5.30s to the 1/8th so this thong should be 5.0s all day?

LOGIC .Please have some before you type. Lol
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Old Jun 15, 2021 | 03:31 AM
  #150  
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You covered this Build @ a Fraction of the Cost....if you used the same Top end you'd have, Guys Riding your Man parts...

https://ls1tech.com/forums/dynamomet...-projects.html
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Old Jun 15, 2021 | 06:54 AM
  #151  
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Originally Posted by Corona
400 rwhp thru a Auto with a Nine second pass 🤔@ What Weight? 🤣 2450 - 2500lbs and Dailed in.

Hold the presses no need for larger combinations 525 Ls3 covers all bases.
Welcome to 2017, 3000-3100lbs, sealed engine in the NMCA chevy performance stock class, 9.8 last I looked. At other races with limited mods allowed (pistons and cam) same engine has run 9.3

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Old Jun 15, 2021 | 06:55 AM
  #152  
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Originally Posted by Mavn
An n/a sbe ls3 has been 5.30s to the 1/8th so this thong should be 5.0s all day?

LOGIC .Please have some before you type. Lol
SBE 5.3 gone faster for cheaper, logic is relative
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Old Jun 15, 2021 | 09:02 AM
  #153  
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Originally Posted by SLOW SEDAN
Welcome to 2017, 3000-3100lbs, sealed engine in the NMCA chevy performance stock class, 9.8 last I looked. At other races with limited mods allowed (pistons and cam) same engine has run 9.3
Actually doesn't matter as this 408 is making over 600+ without having to Spend $5k+ on a topend. ...like I said you'd be the 1st Nut Hugger if it was from you All's guy. no emoji needed.

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Old Jun 15, 2021 | 09:11 AM
  #154  
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Mavn you out did yourself......
More Hp than Any of these with Factory parts... and Cheaper Than.
😉 One Monkeys Hate doesn't Stop Nothing!

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Old Jun 15, 2021 | 09:21 AM
  #155  
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Originally Posted by Corona
Actually doesn't matter as this 408 is making over 600+ without having to Spend $5k+ on a topend. ...like I said you'd be the 1st Nut Hugger if it was from you All's guy. no emoji needed.
What stock LS3 heads cost $5k? They have to use OEM heads, perhaps you missed that part. I can barely understand your posts, its like English is your third language and you drank 13 cups of coffee before 9AM.
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Old Jun 15, 2021 | 09:29 AM
  #156  
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It's certainly been an entertaining morning.
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Old Jun 15, 2021 | 09:50 AM
  #157  
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Originally Posted by SLOW SEDAN
What stock LS3 heads cost $5k? They have to use OEM heads, perhaps you missed that part. I can barely understand your posts, its like English is your third language and you drank 13 cups of coffee before 9AM.
Mavn Didn't Need "NO" Five Thousand dollar Top end to Out Pace What's seen or Anything You may have Brought up. Coffee .....Funny. Nose candy Was Better btw.

I'm Naturally on Some Aggressive 💩. Nothing Needed. 👍
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Old Jun 15, 2021 | 10:16 AM
  #158  
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Originally Posted by 01CamaroSSTx
It's certainly been an entertaining morning.
You spoke too soon
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Old Jun 15, 2021 | 10:37 AM
  #159  
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I need popcorn
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Old Jun 15, 2021 | 12:48 PM
  #160  
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?What's With All The Capital Letters. My eyes are bouncing back and forth looking for a new sentence and period.
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