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Author Topic:   Using vortecs
dode
Dirt Freak

Total posts: 417
posted September 19, 2002 07:53 AM UIN: 13209501
Our rules say that we must use completely stock heads and cast iron intakes, no hi rise or maring. I want to run Vortec heads and have the pistons shaved for 9:1 compression (**** rules). Anyway, I can't run any of the production vortec manifolds, so how can I run an old stock cast iron manifold? I have seen some of the vortec intakes that only use the 8 corner bolts. Can I bolt my old style intake on like that, since the center bolt holes are different? I know I could drill or grind or something, but I would rather not. Thanks.

John

hhc1121
Dirt Newbie

Total posts: 2
posted September 19, 2002 08:00 AM
quote:
Originally posted by dode:
Our rules say that we must use completely stock heads and cast iron intakes, no hi rise or maring. I want to run Vortec heads and have the pistons shaved for 9:1 compression (**** rules). Anyway, I can't run any of the production vortec manifolds, so how can I run an old stock cast iron manifold? I have seen some of the vortec intakes that only use the 8 corner bolts. Can I bolt my old style intake on like that, since the center bolt holes are different? I know I could drill or grind or something, but I would rather not. Thanks.

John


The bolt holes on the vortec heads are at a different angle than stock heads. You can have the heads redrilled for a standard intake, or if you havent purchased them yet, you can buy them predrilled from several different sources.
By the way the vortecs are a great performing head, definately worth the trouble,

dode
Dirt Freak

Total posts: 417
posted September 19, 2002 08:03 AM UIN: 13209501
It's just the center ones that are different right? I just don't want to get caught on the tecnicallity in our rules that says "completely stock" heads.

John

rico 08
Dirt Freak

Total posts: 372
posted September 19, 2002 12:44 PM
the late model(87-95)heads have canted center bolts(around the exhaust crossover)but vortec heads have a pattern where the bolts go straight down and have only 4 bolts per side if you we're machining an intake to fit this it has to be the same depth because vortec's are made to be tightened down until the bolt bottoms in the head to prevent overtightening they also have reuseable gaskets we drill and tap the vortec's to accept the old pattern and use whatever intake we can run chevrolet does not reccomend this but i think they just want people to buy the new syle intake but the new style mounting is a lot more forgiving than the old by the way i do have a pair for sale

Merlin
Dirt Full Roller

Total posts: 26
posted September 19, 2002 09:29 PM
CAREFUL!! if you measure the height and location of a VORTEC intake runner you'll find out that an "old style" manifold will not work with vortec heads. vortec ports are way way way taller and higher than the old school stuff. heads can be drilled to fit the old stuff. BUT, they will BARELY cover the ports in the heads. in other words, they just don't line up right! i wish i could find the link to the cast iron vortec manifold i saw for use with q-jets.(if that is what you have to run) my best suggestion is this: just use a manifold that was designed for those heads no matter what the situation.

Merlin
Dirt Full Roller

Total posts: 26
posted September 19, 2002 10:05 PM
OK everyone!! i found SOME links to vortec intakes. none with the cast iron ones yet but i know it is out there! here ya go: http://www.flatlanderracing.com/intakesgmsb.html http://www.gmpartsdirect.com/performance_parts/store/catalog/Product.jhtml┐PRODID=1000&CATID=995.html

hope this helps even a little bit!

rico 08
Dirt Freak

Total posts: 372
posted September 20, 2002 12:50 PM
yes changing them over does require some careful work it's not a redrill tap and bolt on situation by the way the site you're refering to is bezinski's site they sell a cast iron bowtie intake for 355.00 they also offer a two barrel version but both are a little pricey

rico 08
Dirt Freak

Total posts: 372
posted September 20, 2002 12:51 PM
the site is castheads.com

Merlin
Dirt Full Roller

Total posts: 26
posted September 20, 2002 09:46 PM
How in the heck would you ever get those intakes to line up right? I just can't even see how you'd get the intake gasket to seal.
Do you have an ACE up your sleeve?

Bob0092
Dirt Roller

Total posts: 16
posted September 21, 2002 11:41 PM
heres what we run http://www.sallee-chevrolet.com/Intake_Manifolds/Cast_Iron_Vortec.html

Merlin
Dirt Full Roller

Total posts: 26
posted September 22, 2002 09:37 AM
OK! That is the exact manifold that i had in mind. I thought that you meant you were using the old "standard" style manifold.
Very cool!

rico 08
Dirt Freak

Total posts: 372
posted September 23, 2002 12:37 PM
you run a intake that looks like a plain ol quadrajet intake but has vortec mounting bosses if u look at bezinski's his looks like a fuel injection manifold with the injector holes plugged and a holley pattern it's designed for a boat i wonder which is better? one is definitely cheaper though!

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