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408 truckmanifold kit

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Old Jan 21, 2007 | 11:05 AM
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Default 408 truckmanifold kit

well I started thinking about putting a stroker crank into my 6.0 iron build the only concern I have is the flowing capability of the 2.5" crossover and the manifolds. I have already decided against large tubular headers for a couple of reasons and was wondering if any of you have done such a big motor with the truck manifolds.

fyi on setup 370" S80 t6 flanged 4"dp and exhaust, ported heads, ls6 intake
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Old Jan 21, 2007 | 12:57 PM
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check out one of the stickys thread.
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Old Jan 21, 2007 | 02:13 PM
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They'll flow enough, if you are worried about the crossover, make it 3.0 instead of 2.5.
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Old Jan 21, 2007 | 02:26 PM
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I ran 3 inch crossover on my new setup
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Old Jan 21, 2007 | 02:50 PM
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The biggest restriction is at the turbine housing, running 3'' wont change anything but maybe make it spool slower. The 6.0's have worked great on larger motors then you are considering running.
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Old Jan 21, 2007 | 05:26 PM
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Originally Posted by 02SSLE
I ran 3 inch crossover on my new setup

did you notice any difference with spool?

this is a tang t6 flange should flow nicely
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Old Jan 21, 2007 | 05:32 PM
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Originally Posted by black98ws6ta
The biggest restriction is at the turbine housing, running 3'' wont change anything but maybe make it spool slower. The 6.0's have worked great on larger motors then you are considering running.

what size crossover did you run?
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Old Jan 21, 2007 | 05:34 PM
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2.5 is the most common. The exit at the 6.0l manifolds are around that size, and when you neck it down at the compressor housing. Even a t6 flange/exhaust housing doesnt outflow (2) 2.5 pipes.
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Old Jan 21, 2007 | 05:37 PM
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We have ran 2.5" on our 408 to 1500+ hp. We'll be running 2.5" on our 427 also.
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Old Jan 21, 2007 | 05:40 PM
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Originally Posted by TwnTrboCE
We have ran 2.5" on our 408 to 1500+ hp. We'll be running 2.5" on our 427 also.

oh goody!

408 here we come!!!!!!!!!!
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