Anyway to calculate vacuum from camshaft overlap? - Page 2 - LS1TECH - Camaro and Firebird Forum Discussion



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Anyway to calculate vacuum from camshaft overlap?

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Old 03-19-2017, 06:14 PM   #21
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If it'll idle at 60-65kPa at 1000RPM, then it'd be a very interesting combo...

And yeah, I'd definitely run it with nitrous. The 4C I'm restalling to would work with that.
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Old 03-19-2017, 08:19 PM   #22
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I'm quite sure with the correct cam specs it will idle fine. Pat G knows how to nail the overlap deal perfect..... I wonder myself how critical the lobe separation angle is on the vacuum situation
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Old 03-19-2017, 08:39 PM   #23
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Originally Posted by Tuskyz28 View Post
If I was go do a hydraulic roller motor with a Fast 102 I see no need for a square port cylinder head for a 402-418ci setup.

Me personally I would do a set of Tooley 245 heads rubbed over with the intake ported to match then a badass setup from nitrous outlet if I was go spray. Maybe even a direct port nitrous setup.

Plenty of cars running 9s and 10s on motor with a Fast intake and hydraulic roller with cathedral heads 205cc-245cc intake runner.
I kind of agree with that. Switching to Square port LS3/7 style heads has cost factors like complete rocker setups and a new manifold when larger cathederal 235 and up will do the job, that's kind of how I"m leaning anyway. Though TFS's site says 4.125" or bigger bore for their large cathedral heads

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Old 03-19-2017, 08:47 PM   #24
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64post- I asked Brian Tooley maybe a year ago about the 235 vs 245.... basically said the 245 is the way to go even on a 4.000 bore engine. The 245 head gives you room to grow he said.
235cc is 2.08 intake valve vs the 245cc head is 2.10 intake valve.... not a big difference between the two on paper.
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