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408 lsx heads and cam?

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Old 08-24-2012, 06:24 PM
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Default 408 lsx heads and cam?
Which heads and cam would be best for a carbureted street driven 408 lsx? looking for a lot of power and a good hard hitting lope
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Old 08-24-2012, 08:12 PM
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Ported 317s with a custom grind cam will make 500 rwhp if the exhaust supports it. There is no off the shelf cam for a carbed 408.
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Old 08-24-2012, 10:11 PM
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alright thanks. I did not know that about the cam
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Old 08-25-2012, 04:19 PM
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With that many cubes I would run a set of L92 cylinder heads. That many cubic inches would love the larger runner of those heads. Eric L
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Old 08-25-2012, 08:14 PM
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Would surely take advantage of the ability to have ls3 heads and use velocity compared to smaller engines.
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Old 08-25-2012, 08:30 PM
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Originally Posted by Prorac1
With that many cubes I would run a set of L92 cylinder heads. That many cubic inches would love the larger runner of those heads. Eric L
I agree. And, with 400" motor you could run an off the shelf cam. The bigger motor will do fine with a 112LSA cam. I would pick a mid 230s @ .050" on the intake and mid 240s @ .050" on the exhaust. It will be a beast.
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Old 08-26-2012, 06:28 PM
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and still run on pump gas fine?
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Old 08-27-2012, 01:40 AM
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Depends on what piston your running? And what compression your running. Large lift cams with tight intake centerlines require flycutting/valve relief pistons. Eric L
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Old 08-27-2012, 08:54 AM
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Wiseco pistons somewhere around 9.5:1 -23cc. Lunati crank cam and valve train. And I've about decided to go up to 4.125 bore.
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