69396Chevy

Im installing a set of GMPP Vortec heads and need to know what gaskets and rockers I need. Im new to aluminum heads and arent quite sure. I know they need the self aligning rockers and i want to use 1.6 to get a little more lift out of the cam. What are my options for a good rocker and gasket set and a GREAT rocker and gasket set?

thanks

Scott Marzahl

Have these Vortec heads had the valve guides machined to allow for more than the stock .450" useable lift, if not, no sense buying 1.6 rockers. What cam are you running?

As for gaskets, according to the Fel Pro catalog, Fel Pro 1094 (.015") can be used for aluminum heads. If you need a thicker gasket, GM 10105117 has stainless steel faces for aluminum heads and is .028" thick.

Solid LT1

I don't know of any GMPP aluminum Vortec heads, there are Chinese Vortec style heads but, I have never known of any GMPP Vortec style heads (the "fast burn" aluminum heads have both intake bolt patterns but they are big port heads, is that what you have? Give us a casting number.) Felpro 1010 head gasket is good for aluminum heads. Intake gasket can be sourced from many places. I would run Comp Cams Pro Magnum chrome molly steel rockers but I am not a fan of "rail rockers" as they put big side loading on valve guides and I don't like that "feature".

gingerbreadman1977

i have gm fast burns. i originally had gold line crane roller rockers but wouldnt clear my stud. i had to go to the silve line and use guide plates as these are not self aligning.absolutely use felpro on alloy heads. others will leave an indentation.

DZRick

That's strange, I've got the fastburn heads with the crane gold rollers with no issues.

gingerbreadman1977

i originally had that set up with a large roller cam and heavier than standard springs. back then i didnt have clearance issues either but because of the heavy springs and large lift i did have a problem with the rockers cocking to the side after its first rotation. i then had to go to plan B and that was go to the silver non self aligning with guide plates to fix the problem . you shouldnt use self aligning rockers with guide plates so that why i had to go to the silver. the gold non self aligning touched because of the guide plate thickness raising my geometry. the silver rockers have a larger cut away underneath them so they suited my set up better. i really liked the gold because they looked trick but im happy with the silvers. they are practiacally the same thing anyway.

that was a mouthfull.

DZRick

[QUOTE=gingerbreadman1977;1563956106]i originally had that set up with a large roller cam and heavier than standard springs. back then i didnt have clearance issues either but because of the heavy springs and large lift i did have a problem with the rockers cocking to the side after its first rotation. i then had to go to plan B and that was go to the silver non self aligning with guide plates to fix the problem . you shouldnt use self aligning rockers with guide plates so that why i had to go to the silver. the gold non self aligning touched because of the guide plate thickness raising my geometry. the silver rockers have a larger cut away underneath them so they suited my set up better. i really liked the gold because they looked trick but im happy with the silvers. they are practiacally the same thing anyway.

that was a mouthfull.[/QUOTE]



But it was a good explaination.

69396Chevy

Hmmm not sure . . Im running a crower cam with .460 int and 470 exh lift? So my head guy better check this out huh. Also noticed what looks like a Performer RPM Airgap in those pics, do you have hood clearnace issues? Ive put an LT1 hood on mine and would like to use that intake if possible.

69396Chevy

Casting numbers are 12367712.

DZRick

I've got the GMPP hotcam with .525 on both the int and exh so at least that shouldn't be a problem for you.

69396Chevy

What do you mean you dont know of any GMPP Aluminum Vortec heads??

jackson

per GMPP 2007 hardcatalog
casting # 12367713 is used for both:
p/n 12464298 (assembled) and ...
p/n 12497186 (bare)
Those have dual-style intake flange (including vortec) but they're commonly referred to as "fast burns" ... GM lists them as "Aluminum Fast Burn Heads".

Typically, "vortec" means IRON sbc heads as found on OE production 96-02 L31 / R motors and aftermarket genuine GM "Vortec Cylinder Heads" p/n 12558060 (assembled) & p/n 12529093 (bare) with c/n's 10239906 or 12558062.

GM installs head gasket p/n 10105117 in ZZ383 w/ fast burns ... it's composite, about 0.028" thin & about 5.8cc vol.

-edit- I see several online sources referencing 12367712 as a head like 12367713 ... if I had to guess, it's the other way 'round ... later 713 like earlier712 dunno?

gingerbreadman1977

an air gap manifold only fits under a stock hood with a demon carb . im not sure about a holley even though they are close to the same thing but i think it would. i know it says on edelbrocks site when you look at the airgap "WILL NOT FIT UNDER STOCK CORVETTE HOOD " but thats because they are referring if it was with an edelbrock carb. the demon has a much lower profile then a rochy or edelbrock . so to answer your question that is how it fits. mine has about three quarter of an inch clearance. mine is a stock 81 hood and i am running a 3 inch drop base air-cleaner.