Chevy Vortec intake drilling to standard intake
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Chevy Vortec intake drilling to standard intake
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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Adam
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Depends on what vortec.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
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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votec intake bolt pattern
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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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.
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.