I just installed this cam in my stock bottom end roller 302 with TW170 heads. Exhaust valve clearance is plenty (don't remember exact amount but well over .120). Intake valve clearance was a little tight, about .070
The TW170 valves are larger which would decrease PTV clearance but also the twisted angle of the valves would help increase it, so not sure how that would translate for your GT40 heads.
Also note, when I received my cam the specs were slightly different according to the cam card (specs below) than what is shown online. I had to retard the cam 2 degrees (total of 4 degrees advance) to help with the intake PTV clearance. The online specs show it is ground with 4 degrees of advance (108 centerline) but came advertised with 6 degrees of advance (106 centerline).
I did degree the cam to verify the 108 centerline.
I know of others running this cam with stock pistons but don't know what their clearance is.

Specs from my cam card:

Lunati Voodoo 20350711
Advertised Duration (Int/Exh): 273/279
Duration @ .050 (Int/Exh): 221/227
Gross Valve Lift (Int/Exh): .549/.565
LSA/ICL: 112/106

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You have to check your clearance.

You don't have to rely on someone else's setup.

Every single engine is different, thus you should check it. If nothing else, you will be sure of what clearance you have instead of guessing.

 

Thanks ragtop50 that is exactly what I wanted to know. Much appreciated.

Toddturbo-read the first sentence I wrote

 

How do you guys like this cam so far?

 

Define like, or as compared to what?

 

Hey thanks for responding. So do you run this particular cam?

 

Nope, I wouldn't personally, there's better to be had, but that's a choice I would make.

 

I went 12.93 in my wagon with a explorer 302, ported tw heads, dual plane intake, short headers, c4 and the cam you listed.

I don’t have enough torque converter or gear (3.55) and only cut 1.90 60 ft.

The plan is 4.10’s, more converter and aggressive tune (87 octane). I think I can do 12.3-12.4.

I’m sure there are better cams, but it seems fine to me. I think in 1 of my mustangs with a 4.10 and manual I could run high 11’s with practice. I don’t know how it would be with efi.
I ran 12.95 in this video

 

Good info. It's nice to see somebody offer up some info who actually runs the cam, lol. I won't jack this guys thread anymore. Thanks

 

I love my VooDoo cam so far, I think it is the best OTS cam for my setup. Bigger is not always better.

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Good luck. I can’t wait to install my cam. I opted for a Comp XE-270-114 for my
GT40 setup. I can’t wait.

 

Find someone with a cam doctor.

There are zero secrets any more.