Chevy Vortec intake drilling to standard intake

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af2
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Chevy Vortec intake drilling to standard intake

Post by af2 » Tue May 26, 2009 8:56 pm

I have seen a plate that allows you to drill the standard intake holes. I haven't seen one as of late and need one for my son's Vortec. He found out about ProComp seats dropping!!!! Iron heads even!!! That will be another thread!
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Post by Keith Morganstein » Tue May 26, 2009 9:28 pm

I have one of the plates. It's BHJ / goodson. It's quite expensive, but works slick.

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Post by af2 » Tue May 26, 2009 9:36 pm

I wish most of you were closer!
Keith, if I can't find someone to do it closer I will call you. The shipping is going to kick my a$$$. :)
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Post by machine shop tom » Tue May 26, 2009 10:05 pm

I don't like the idea of drilling Vor-Tec heads for earlier style intakes. There isn't enough metal for strong threads and the end holes go through to the water jacket.

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Post by Keith Morganstein » Tue May 26, 2009 10:21 pm

machine shop tom wrote:I don't like the idea of drilling Vor-Tec heads for earlier style intakes. There isn't enough metal for strong threads and the end holes go through to the water jacket.

tom
Depends on what vortec.

Stock 906 / 062 gm vortecs don't have much material and you have to be careful tightening bolts.

There are some decent vortec manifolds, but adding the two center holes to vortec heads helps keep the gaskets in place.

Most aftermarket vortecs have plenty of meat for drilling.

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Post by af2 » Tue May 26, 2009 10:36 pm

They are 062.
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Post by novadude » Tue May 26, 2009 10:40 pm

Will a standard 55-86 Performer or Performer RPM intake seal to the re-drilled vortecs, or the aftermarket heads with dual drilling (RHS, EQheads, etc), or is the Vortec port too high for a common dual plane?

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Post by Mike Rogers » Wed May 27, 2009 8:59 am

The EQ heads you can buy with the pre 86 intake and valve cover bolt arrangement. These are not re-drills.
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Post by Racerrick » Wed May 27, 2009 9:27 am

There is a felpro vortec gasket with both patterns. You can use it a a temp plate. Drill the head for fine thread bolts and you have no problems. Torque to 25lbs.

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Post by novadude » Wed May 27, 2009 11:25 am

Mike Rogers wrote:The EQ heads you can buy with the pre 86 intake and valve cover bolt arrangement. These are not re-drills.
These are vortec style chambers w/ standard height intake ports?

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Post by robert1 » Wed May 27, 2009 11:30 am

I just finished an engine with 906s on it drilled for the old intake. The shop used the Goodson fixture. The holes were a little lower than I would like but ok. The end holes didn't go into water.

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votec intake bolt pattern

Post by soup » Wed May 27, 2009 1:29 pm

We have done dozens of old intake patterns using a 1205 gasket(or 1204) as a template,just use a transfer punch.The 1255 gasket bolt pattern is not correct,the center bolt holes are too low.You have to be careful on the end bolts because they will intersect with original holes.Make sure the end bolts are sealed up when assembling.I also plug original holes with set screws,loctited.You may need to double intake gaskets.

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Post by needforspeed66gt » Wed May 27, 2009 9:23 pm

I have that jig.
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Post by af2 » Wed May 27, 2009 9:49 pm

needforspeed66gt wrote:I have that jig.
Should I pm??
Thanks Adam
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Post by dwilliams » Mon Jun 01, 2009 7:17 am

I made a jig from some steel flat and some drill bushings. It was a lot cheaper than buying one.

I did two pair of 062 heads. The intake faces were, oh, maybe a bit over 1/8" thick. I used 5/16" fine thread bolts to get more than two threads. Both pair of heads worked, but I always felt it was a very iffy deal. A hair too much on the wrench, and you'd be trying to figure out how to braze in a Keen-Sert or something.

Maybe not all of the heads are that thin, but I'm not happy at all with the thread engagement of the ones I did. I suggest you drill some small pilot holes first, just to see how thick your heads are, before doing this.

If I was racing in one of the stock intake/stock head classes, I'd look for one of the GM four barrel marine intakes before I'd drill another pair of Vortecs.

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