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Old 12-01-2011, 07:59 AM
Hwyhogg's Avatar
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vacuum at idle

Hi all,
Just curious, when setting the idle mixture on my newly broken in engine, the max vacuum at ~800 rpm in PARK was about 14 in. It is a 460 bored .030, 9.5:1 with a holley avenger 770 and performer RPM intake. Does this vacuum seem appropriate...also, anyone with a dyno program to estimate hp/tq? In a couple of weeks I will probably get a chassis dyno tune and will report back here with numbers. Not so much concerned about hp numbers as I am the tune...but am still curious. Thanks

The cam specs are:
@ .050 lift; duration is 224 int/234 exh with gross lift .544 int/ .569 exh
-rocker arm ratio 1.73
-Aluminum Cobra jet heads with 2.19/1.76 valves

FYI, the Melling part no. is 24207. Their site shows this cam range should be ~2200-6000 rpm with peak torque at 3000 rpm.

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Old 12-01-2011, 11:03 AM
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Without all exact inputs, using 110* lobe seperation, I came up with 564 FT/LBS at 3600 and 437 HP at 4300.
I'm sure the HP is way off.

I can work on it a bit when I get home tonight.
Do you have the exact cam specs?

Interesting that vac at idle shows 15".

I just checked and I had the bore x stroke wrong.
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Old 12-01-2011, 11:19 AM
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I checked it out again.
534 FT/LBS at 4000
467 HP at 5200

14.4" vac idle
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