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#1 |
Registered User
Join Date: Jul 2011
Location: martville.ny
Posts: 18
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I have a chance to get vortec heads for free off my bro's truck. Its a 1998 k2500 with a 350. I wanted to put the heads on a 70s 350. Will my intake work? Any modifacation id have to do? thanks
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Matt ![]() 1986 chevy K10 355, sm465/np208, 14FF/dana 44 1984 chevy K20 350, th400/np208, 14SF/10 bolt |
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#2 |
Registered User
Join Date: Mar 2011
Location: alpena ar
Posts: 133
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Re: vortec heads
you will have to change intakes and exhast manifolds
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#3 |
Registered User
Join Date: Dec 2010
Location: freeburg, illinois
Posts: 885
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Re: vortec heads
Which vortec heads are they if I'm correct there's 2 of them the heavy duty trucks apparently had the lesser flowing heads of the two I can't remember the #s but a Google search would bring up a ton on them
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1987 Chevy V30 - http://67-72chevytrucks.com/vboard/s...d.php?t=573854 1988 IROC-Z Camaro - 305/T5 T-Top 1989 GMC V35 - Marbolo Express http://67-72chevytrucks.com/vboard/s...d.php?t=596850 1991 V2500 Suburban Silverado - Sold 1991 V2500 Suburban Scottsdale - Big Nasty http://67-72chevytrucks.com/vboard/s...d.php?t=497423 2001 Ram 3500 5.9 H.O NV56 EC DRW - Sold 2003 1500 Silverado 2004 Ram 3500 5.9 H.O NV56 CC DRW - Sold 2005 Silverado 2500HD 6.6/ZF6 CC LWB |
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#4 |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: vortec heads
Some ¾- and 1-ton trucks came with Vortec heads equipped with a specially hardened exhaust seat that kills low- and mid-lift flow. Casting number 10239906 should be avoided. Look for casting number 12558062....
read this thread, it answers everything you need to know and more about Vortecs http://67-72chevytrucks.com/vboard/s...d.php?t=485197 |
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#5 |
Registered User
Join Date: Jul 2011
Location: martville.ny
Posts: 18
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Re: vortec heads
Im not sure what the head numbers are, they are still in the truck
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Matt ![]() 1986 chevy K10 355, sm465/np208, 14FF/dana 44 1984 chevy K20 350, th400/np208, 14SF/10 bolt |
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#6 |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: vortec heads
All early Vortec heads have part number 125508060. But these are made from two different castings 10239906 or 12558062. The difference between them is that the 906 uses hard seat inserts and the 062 uses induction hardening. Either makes a production L-31 truck head. The 906 is usually found on heavy duty trucks. Both "060" heads use 1.94/1.50 valves with a 165-170 cc intake port.
Exhaust bolts up intake does not .....production L31's need a 8 bolt style intake. Gm "bowtie vortecs" special parts dept heads, have a dual bolt pattern for intake 8 or 12 Last edited by RUSHNBOBO; 10-21-2011 at 07:27 PM. |
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#7 |
Registered User
Join Date: May 2008
Location: Salt Lake City
Posts: 365
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Re: vortec heads
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#8 |
Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: vortec heads
The only 906's to avoid are the very first ones. After that, GM used smaller press-in seats that didn't hang so far out into the port.
Don't even try to redrill your intake to work, vortec ports are raised .100 and they're taller and narrower than conventional. Check sleazebay, you can generally get a good dual plane vortec intake for around $100. Make sure you read about retainer to guide clearance issues, particularly if you're going with a cam with over .450 or so lift at the valve. Great heads, spend a few minutes with a Dremel or die grinder working the ridge in the exhaust short turn. It's a sharp edge and doesn't take but a few minutes to blend it into the runner. Blend the seats into the ports as well. DON'T TRY TO RESHAPE THE PORT, JUST BLEND THE CUTTER/MACHINING LINES!!! |
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#9 |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: vortec heads
Use Crane Cam’s 10309-1 drop-in valve spring and retainer kit which is good for .550” lift with no machining.” about $160 bucks
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#10 |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: vortec heads
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#11 |
Registered User
Join Date: Jul 2010
Location: Houston,Tx.
Posts: 241
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Re: vortec heads
whta would the front of the vortec head look like pattern wise in front. you know how they got a design infront. cuz i really aint trying to open up the valve cover cuz i got this luck with gaskets that man let me tell you.
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#12 |
Account Suspended
Join Date: Jun 2010
Location: Placerville Ca.
Posts: 982
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Re: vortec heads
906
![]() 062 Last edited by RUSHNBOBO; 10-21-2011 at 06:28 PM. |
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#13 |
Registered User
Join Date: Oct 2005
Location: Branchville SC
Posts: 1,647
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Re: vortec heads
Just intake, you dont need new manifolds..
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2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks.. |
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Tags |
2500, 350, heads, k20, vortec |
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