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Old 09-28-2011, 12:04 AM
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vortec 406 street strip cam help

I have 1 1979 malibu with pretty much stock weight glass bumpers but added sunroof weight and stereo. No heater box. The car has 3.42 gears and an eaton posi in a grand national 8.5 housing. I have a 2500 rpm 12" stall and a 3000 rpm 10" stall. The exhaust is in the air as of size and primary size but I will be running an x pipe and pypes race pro mufflers. Now that you know about the car my plans for it is a street strip type of vehicle. Really fast street car weekdays weekend racer.
So now heres are the motor specs:
sb400 bored 40 over
9.9:1 compression
vortec heads set up for high lift
Performer rpm airgap
have a holley 750 vs. carb and a aed 950 ms carb
My cam choices currently are 2 Lunati voodoo solid tappet cams which are as follows:

Lunati Voodoo 60140
Adv. Duration:266/276
Duration @ 0.050" :233/241
Gross Lift:.505"/.520"
Valve Lash:.016"/.016"
RPM Range:2400-6600

and the other choice is
Lunati Voodoo 60141
Adv. Duration:276/282
Duration @ 0.050" :241/249
Gross Lift:.520"/.540"
Valve Lash:.016"/.016"
RPM Range:2600-6800

Need vacuum brakes and a canister is acceptable. Either cam will be used with 1.5 rockers. My last cam used in this motor was the lunati 60103 and it was ok just want alot more power. Liked the instant power of this cam and snappy throttle response but I ran 1.6 rockers on this cam
old cam
Adv. Duration:268/276
Duration @ 0.050" :227/233
Gross Valve Lift:.489"/.504"
Lobe Separation Angle / Intake Centerline:110/106
Valve Lash:Hyd/Hyd
RPM Range:1800-6200

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Old 09-28-2011, 10:16 AM
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Why a solid cam? That can be a poor choice for a street car.. I mean I personally don't want to be adjusting valves every couple weeks. I would think your second cam choice is a little big for stock vortec heads. Do some research on what kind of duration those heads like. Im running 236/246 @ .050 on my vortec heads and a lot of people told me thats more than the stock heads can support... especially at 170cc. You might want to look into getting some work done on the heads.. maybe larger exhaust valves to bring up that I/E ratio.... or maybe even a set of alum heads.
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Old 09-28-2011, 10:30 AM
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The first cam you selected probably wont be noticeably different from what you have now, but as already noted, your heads are what is choking you.

You can dump some money into them and have them ported out along with a valve job, or just buy a better set of heads.

Due to all the hype about velocity I see a lot of people running too small of a head for their power goals. While velocity is important, too much of it just creates choke.

When I do Vortec heads I usually end up with about a 190cc runner, and even that is small for a healthy 350.
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Old 09-28-2011, 06:16 PM
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i currently have a 406 sbc with procomp 210cc aluminum heads a lunati voodoo 60105 hydraulic camshaft with 10.5 to 1 comp. a 750 holley double pumper and this camshaft does everything its says it will do i shift at 6700 rpms and it gets there in a hurry. this engine is also in a 1981 malibu. i would reccomend this camshaft to anyone. it sounds really wild.

i have a 350 turbo with 3500 stall and 4.10 gears.

i set my intial timing at 24 degrees and this engine loves it
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Old 09-28-2011, 10:10 PM
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Originally Posted by zildjian4life218
Why a solid cam? That can be a poor choice for a street car.. I mean I personally don't want to be adjusting valves every couple weeks.
That's old school thinking, it doesn't hurt to check them every six months or so. I run a custom grind Lunati solid roller, .590 lift, with the aggressive VooDoo profile, and haven't needed an adjustment for over a year, using ARP PermaLoc's. You'll have a little more noise, if that bothers you...
When I die I want to go peacefully - in my sleep, not yelling and screaming like passengers in my car...

Midnight Sun Street Rod Association

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