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ls3 head or cnc cathedral port?

Old 08-25-2010, 02:59 PM
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Default ls3 head or cnc cathedral port?

close to assembly for my awd full size van. Yes another turbo van. I have ls3 heads, and a set of west coast cylinder head 317's....that flowed rt at 307 cfm I think.

Which to use. I have both the l92 truck intake and the 317 truck intake.

Its for a 405ci motor with an st80, 4l80e.........

The junk parts are getting pretty good.
Old 08-25-2010, 03:18 PM
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Which one gets the c/r where you want it? Ported 317's are usually comparable with stock LS3 heads. Won't make much difference flow wise.
Old 08-25-2010, 10:59 PM
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i believe the stock ls3 heads flow like 320-325. i have a set that are p&p'd and flow 360 @ 600. can't beat the ported ls3's from sdpc for 1200.00/set. or check with tsp, they get some nice #'s to for the money.


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