LS1TECH - Camaro and Firebird Forum Discussion

Forced Induction Superchargers | Turbochargers | Intercoolers

370 or 408 ?

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Old Nov 22, 2011 | 05:08 PM
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Default 370 or 408 ?
Looking to do a Single turbo setup, hate to buy a forged crank and not go stroker. Will a 408 make more power and be just as dependable as a 370 or is it a must not to go stroker with a turbo. Would like to do Trickflow or afr 225 9 to 1 comp and maybe a PT88? around 15-18psi would love to hit 750-800 RWHP if possible i'll be using truck manifolds on the setup also. any input appreciated
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Old Nov 22, 2011 | 06:04 PM
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Save your money and just use a stock crank. Im building a single 76mm turbo 10 to 1 comp 370 and I should be around 750-800 whp on 15 pounds.
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Old Nov 22, 2011 | 06:05 PM
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Also...98cobrakiller has gone low 9s high 8s with a stock crank I believe.
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Old Nov 22, 2011 | 07:42 PM
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another vote for 370 with a stock crank at that power level. only reason i'm using a 402 is because i already had it in the car n/a.
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Old Nov 22, 2011 | 09:08 PM
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Any street use? Me and buddy had 91mm with 408 and 370. Both made about same power but 408 had less lag.
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Old Nov 22, 2011 | 10:56 PM
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Almost all engine builders will tell you shorter stroke= more reliability. But if your going to buy a forged crank and what not, you should check this out
https://ls1tech.com/forums/forced-in...rankshaft.html
It's an in between of your two choices. I bought this engine and I'm planing 1000rwhp.
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Old Nov 23, 2011 | 12:39 AM
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Off subject but For the truck manifold set up could I use flat top pistons on 10 1/2 compression
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Old Nov 23, 2011 | 01:07 AM
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Nitroused383 is running 11 to 11 and his car runs strong
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Old Nov 23, 2011 | 01:07 AM
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11 to 1****
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Old Nov 23, 2011 | 03:08 PM
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Originally Posted by 703 CAMAROSS
Almost all engine builders will tell you shorter stroke= more reliability. But if your going to buy a forged crank and what not, you should check this out
https://ls1tech.com/forums/forced-in...rankshaft.html
It's an in between of your two choices. I bought this engine and I'm planing 1000rwhp.
Good info



What would the HP difference be between the 370 and 408 if everything else was equal(amount of boost, heads, etc)?
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Old Nov 23, 2011 | 03:34 PM
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408 will make more power with all things being the same due to the extra cubic inches however I just tore mine down and have to replace pistons due to the 4 inch stroke causing a large amount of wear on the piston skirts.
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Old Nov 23, 2011 | 03:43 PM
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Turbocharger will dictate power, not the engine size. Engine size will affect spool and how the power is delivered, but there will be negligable difference to overall power available
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Old Nov 23, 2011 | 03:56 PM
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What model of pistons
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Old Nov 23, 2011 | 04:15 PM
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weiscos
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Old Nov 25, 2011 | 06:38 PM
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How many miles did it make
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Old Nov 26, 2011 | 12:56 PM
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370 and pt 88 would work really good.

There is a slightly used pt88 in the eastern classifieds if you are interested.
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Old Dec 1, 2011 | 06:15 PM
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What about a 370 with a GT91? Is that turbo too large for a 370?
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Old Dec 1, 2011 | 06:29 PM
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Originally Posted by scooter k
What about a 370 with a GT91? Is that turbo too large for a 370?
Search mightymouse on here! lol 8.4x's running that combo at 3700+ lbs and drives it everywhere with a 4l80!
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Old Dec 1, 2011 | 06:41 PM
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Originally Posted by PRAY HRD
Search mightymouse on here! lol 8.4x's running that combo at 3700+ lbs and drives it everywhere with a 4l80!
Dave has an ERL block. The longer sleeves stabilize the piston with the 4" stroke. I always had a lot of skirt wear with a 4" stroke on a stock block.
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Old Dec 1, 2011 | 06:42 PM
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Originally Posted by PRAY HRD
Search mightymouse on here! lol 8.4x's running that combo at 3700+ lbs and drives it everywhere with a 4l80!
What about if it's 5500 lbs truck?
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