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062 vs 906 vortec
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08-16-2012, 08:23 AM
#1
zac Registered User Join Date: Jul 2008 Location: louisville, ky Posts: 505
062 vs 906 vortec Was any ACTUAL information ever discovered regarding this issue? I'm not talking about the usual internet BS. I am going to proceed as if the castings are basically identical unless someone can prove definitvely they aren't.
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08-16-2012, 10:52 AM
#2
ka_jd7and1 is a fungineer Join Date: Jan 2009 Location: Bakersfield, CA Posts: 795
Re: 062 vs 906 vortec They're the same. __________________ 2003 S10, 2.2 auto- the daily driver, currently with a 2"/2" drop and some minor engine bolt-ons 1978 Impala 2-door, race 350/T350 - the new race car, in progress 1968 Chevy C10 longbed- 3/5 drop, currently undergoing a heart transplant
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08-16-2012, 12:16 PM
#3
RRR18 Registered User Join Date: Nov 2010 Location: The Yo, OH->Tuc, AZ->The Yo, OH->Wentzville, MO Posts: 873
Re: 062 vs 906 vortec What I found awhile ago on NastyZ28.com....... L-31 Vortecs -- there are two castings with two versions of one of these castings (#906). The two castings are the #062 and #906. The #906 is the same as the 062 with the exception as noted below. Using the 906 heads myself, I can safely say do not worry about any percieved weakness in HP potential in comparison to the 062. They both make the same amount of power. The 062 is the head you will get when buying the Vortecs from the dealership/GMPP.•Vortec heads were designed based on the 1996 Caprice 9C1/Impala SS LT1 cast-iron head castings. The only difference is the water jacket revision so these heads could be used on conventionally-cooled small blocks. The 1996 LT1 cast-iron head was the highest-flowing LT1 head used by GM. These heads outflowed the Corvette/f-body aluminum LT1 heads reportedly by 20 cfm on the intake side. The cast-iron head was in development 6 months longer than the aluminum head and during that time GM engineers tweaked the ports for the additional flow. •Two Vortec castings were used from 1996-99 on GM CK trucks ('00 in vans) and SUV's utilizing the Vortec 5700 350 engine. The #906 and #062. The #906 casting head was available in two versions. One has an Inconel exhaust seat with a single angle grind, and the other has the conventional 3-angle grind on the exhausts as per the #062. The #906 with Inconel seat does not intrude into the exhaust port. It was used primarily on the HD and 1-ton truck applications where sustained towing of heavy loads & weight up inclines could cause eventual damage to a standard induction-hardened exhaust seat from excessive heat. •The only difference between the #062 and #906 Vortec head is in the exhaust seat of the HD/1-ton truck #906 version, as described above. The #062 has a 3-angle grind on a standard induction-hardened seat, as does the non-HD #906 head. The 062 does flow slightly better on the exhaust side at low lifts but the advantage over a 906 is very slight. They both utilize back-cut exhaust valves. They both have 3-angle grind seats on the intakes with back-cut intake valves. Both heads make the same power in stock form. •Vortec heads were used exclusively in trucks and SUV's. No passenger cars were equipped with these heads. •Stock out-of-the-box Vortec heads have approx. 480HP potential naturally-aspirated. Fully race-ported flowing 275 cfm @ 28" water with 2.055/1.60 valves, potential is approx. 580 HP. There are reports of some shops getting close to 300 cfm out of these heads in fully-ported form. •Retainer to guide clearance is the primary Achille's Heel of the Vortec. For valve lifts above .460" they need to be checked for R-G clearance. This varies from head to head. Some find they can get .480" and slightly more valve lift fine. Others will find .460" about the limit. Always check R-G with any performance cam above .460". __________________ '67 BAD IDEA Follow on Instagram https://www.instagram.com/rtimes3c10/ Ryan
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062 vs 906 vortec 
08-16-2012, 08:23 AM 
Join Date: Jul 2008 Location: louisville, ky Posts: 505 
Join Date: Jan 2009 Location: Bakersfield, CA Posts: 795 
Join Date: Nov 2010 Location: The Yo, OH->Tuc, AZ->The Yo, OH->Wentzville, MO Posts: 873 
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