vortec heads 906's or 062's ?

[mymontesa70]

 does anybody have a concrete answer on 906s vs 062s ? you can google it for days but there are a ton of conflicting answers as to which is "preferred" .

 

just kind of want the piece of mind of knowing im doing it right the first time.

 

thanks as always,

 

[Its Just Me]

Brandon:

 

http://www.onedirt.com/tech-stories/engine/a-guide-to-vortec-vs-oe-small-block-chevy-heads/

 

Here's a quote from the link above:

 

 

"The L31 Vortec comes in two different casting numbers, 10239906 (#906) or 12558062 (#062). Originally, the stock #906 casting head was available in two versions. One version had an Inconel exhaust seat with single angle valve grind and was available on 1 ton trucks. The other version was the traditional three angle valve grind. Other than that, the #906 is the same as the #062 head."

 

 

I think people get too hung up on the 906 vs 062 controversy. The only difference was that "some" 906's had a single angle valve grind while all the 062's had 3 angle. Anyone choosing to use a set of used GM vortec heads should remember that they are going on 20 years old. Most 20 year old heads probably have a pile of miles on them and need a valve job anyway. At this point, who cares what kind of grind GM did at the factory? You get to choose. I don't know of any performance machine shops that even do single angle grinds anymore. 3 angle is standard and a 5 angle is very common. In other words....don't sweat 906 vs 062, either is fine.

 

Now for my opinion that you didn't ask for (but the price is the same):

If you're going to run a set of used vortec's on a stock engine, you will never know the difference between a single or 3 angle grind in the way it runs or performs. If you're going to use them in a performance application, they'll be spending some time at a machine shop getting a new 3 or 5 angle valve job, pinning the studs or tapping them for screw in studs & push rod guides and getting some springs to accommodate more than .465" lift. And don't forget the standard cleaning, checking for cracks, checking the valve guides, truing the surfaces & new seals. By the time you do all that, you may as well consider these:

 

http://www.jegs.com/webapp/wcs/stores/servlet/SearchResultsPageCmd?Ntt=2151&requestYear=&storeId=10001&catalogId=10002&langId=-1&year=&make=&model=&submodel=&engine=&Nrpp=&No=&persistYmm=false

 

Scott

 

 

 

 

 

[monte70car]

The only other item to think about is intake style. With Vortec heads you have to switch over to an intake with 8 hold down points. And also the center bolt down valve covers. There used to be Vortec heads on the market that took either the older style intake or the newer Vortech style and you could run the older style valve covers.

[mymontesa70]

thanks for the responses. i appreciate it