Cams and vacuum
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Cams and vacuum
Looking for info on what cams everbody is running and the vacuum they are pulling. We have two classes in the mud drags that pull 19 and 17 inches for street trucks. Just tring to get a some info for a cam selection. Thanks
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From: Delaware
It's a custom HR from Comp Cams. It has 0.600I/E lift, and 273/299 Seat-to-seat, 224/244 @0.050" duration. The LSA is 114 degrees, and the overlap is about 58 degrees.
Ordinarily that overlap should produce more vacuum, but the ramp rate is so high for this cam that the valves are at a higher lift longer during the overlap period.
Ordinarily that overlap should produce more vacuum, but the ramp rate is so high for this cam that the valves are at a higher lift longer during the overlap period.
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Joined: Nov 2008
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From: wyoming
cam stuff.
If you get with some of the custom cam companys they may know how to get the most bang for the buck situation for you. Buying just off the shelf stuff works pretty good but having a guy do a little majic for you would be a little better. I run the MPG heads/cam research stuff and maybe scott can do some majic check him out.
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Joined: Jan 2011
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From: Tanilba bay NSW Australia
I'm running the 265 DEH in my 400. Yet to put a vac gauge on it but everything vac operated brakes etc all ok. I have a gauge but car in bits so haven't tried it yet but will post soon when I do.
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From: Tanilba bay NSW Australia
put the vac gauge in over weekend. At idle in gear 11" and foot on the brake. cruising at 60mph can sit 15-16". Light throttle 45-50mph close to 20". This is with dual pipes but factory headers, 302cc aussie heads ported to gaskets with 4V valves, Holley street Dominator single plane. 3/4" spacer, 725 Holley vac sec carby, 425 impco lpg mixer fitted for duel fuel and most importantly a 265DEH comps cam.
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Freshman User
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put the vac gauge in over weekend. At idle in gear 11" and foot on the brake. cruising at 60mph can sit 15-16". Light throttle 45-50mph close to 20". This is with dual pipes but factory headers, 302cc aussie heads ported to gaskets with 4V valves, Holley street Dominator single plane. 3/4" spacer, 725 Holley vac sec carby, 425 impco lpg mixer fitted for duel fuel and most importantly a 265DEH comps cam.
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