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Old 12-01-2002, 09:59 AM   #1
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vortec heads, which is better 906 or 062?
i'm wanting to switch to vortec head for a 88 350 tpi motor that i have. i noticed 2 different castings for the vortec heads, 906 and 062. which is better? is there any difference in them? i have the 062 castings off a 98 chevy k1500 350 motor. thanks for any info. tom
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Old 12-01-2002, 12:01 PM   #2
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Like you said vortec heads came with 2 casting #'s. the better of the 2 are the 906 casting heads because they have like 20% better flow over the 062 heads. 062 heads come of the 3/4 ton trucks. So you have the lower flowing vortec head but hey man be happy you have vortec heads man those heads work wonders. But all in all 062 is less flow and 906 is high flow. Now remember if you bolt on those heads your goin to need the special intake base to be compatable with the vortec heads. SDPC sells them for around $400 hope that anwsers your question.

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Old 12-01-2002, 12:12 PM   #3
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yes, thanks for the help. the 062 heads came off my uncles 98 1/2 ton 4x4. thanks again, tom
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Old 12-01-2002, 12:34 PM   #4
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No Problem man. Hey when u bolt them on and get some dyno figures let me know ok...

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Old 12-01-2002, 05:06 PM   #5
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did some more searching on the internet, found this website that says the vortec heads had 2 casting numbers 10239906 and 12558062. no difference's were mentioned. www.streetrodstuff.com/products/115/.
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Old 12-01-2002, 05:30 PM   #6
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They are just giving the 2 types of heads. But still the 906 heads are the better flowing heads.

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Old 12-01-2002, 05:32 PM   #7
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Hey looking at what ur sayin about your IROC.. I have the same year IROC w/ a TPI. Just wondering what cam you put in and how did it help.
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Old 12-01-2002, 05:43 PM   #8
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when i rebuilt the motor, (had block bored .030) i installed the comp cam for the 305/350tpi. it has .444 lift on both intake and exhaust. it helped some (i wanted to keep a good idle and vacuum so i didn't go too crazy) i'm looking for headers next. thanks, tom
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Old 12-01-2002, 05:45 PM   #9
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I think Fbirdta878787 has the heads reversed. The 906's are the ones that flow less. In Chevy high performance jan '03 issue on page 40 they state that the 10239906 heads are for 3/4 and 1 ton trucks and have specially harded valve seats thats kills low end and mid range lift flow. I had the 906's on my engine in my 69 camaro and they run good but I think the other casting is better.
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Old 12-01-2002, 06:27 PM   #10
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i know that my heads (062 casting) came from a 98 1/2 ton 4x4. (as i removed the motor myself and install a new GM longblock) i don't know, i was just wondering if there is a difference between the casting numbers. thanks, tom
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Old 12-02-2002, 12:14 PM   #11
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ohh F U G G!! Can someone PLEASE verify what's what and what "flows better"?

Also, I have 2 sets one say "Made in Mexico" the other says "Made in Canada"....any knowledge on some possible differences?????
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Old 12-02-2002, 11:23 PM   #12
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I concur with Todd. The article said to AVOID the 906's.
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Old 09-18-2010, 02:04 AM   #13
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Re: vortec heads, which is better 906 or 062?
all remarks made about 906"s having less flow in hotrod magazine were retracted at a later date as these remarks were false. although it is advisable to blend the exaust seets to the port.
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Old 09-18-2010, 05:10 AM   #14
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Re: vortec heads, which is better 906 or 062?
Quote:
Originally Posted by vortec nova View Post
all remarks made about 906"s having less flow in hotrod magazine were retracted at a later date as these remarks were false.
Indeed:

http://www.sallee-chevrolet.com/Cyli...ads/Vortec.cfm
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Old 09-19-2010, 05:39 PM   #15
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Re: vortec heads, which is better 906 or 062?
Yup...Wow this is back from the dead. It has been stated that and proven that the 062 head do not flow more but have a stronger exhaust seat.
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Old 09-19-2010, 05:39 PM
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