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Old 02-24-2012, 07:41 AM
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vortec heads cracking?

Hi, just going to fit my vortec heads(906) ready for the new season,have been reading that they are prone to cracking! Do they crack in a certain place? if so where do I need to look, if they are can I weld them up and what rods do I need to use?,thanks in advance Dave

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Old 02-24-2012, 11:44 AM
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There is a very simple way to avoid getting a cracked vortec head.
DON:T buy junk yard vortec heads!. 99.9999% of vortec heads that are cracked came off a vortec motor that had a coolant leak issue and overheated. coolant loss at the intake manifold gasket is common on these motors.

No body sells off good vortec heads from a vortec motor unless they are cracked.

Any decent machine shop can mag check your heads.

new vortecs rarely crack. EVER.
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Old 02-24-2012, 04:51 PM
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These heads usually crack from the center exhaust seats to the nearest cooling crossover or center head bolt hole. Minor head bolt hole cracking can be fixed by drilling and reaming the hole oversize (usually 5/8") past the end of crack, about 1 1/8" deep. Then pressing a repair locktite coated sleeve ( I use a farm tractor cast iron guide) into the oversized hole. Then drill the ID. of the sleeve to std bolt hole size. Trim length. Mill head. Never had a return.

Seat cracks cannot be welded by a novice. The insert type seats, if equipped, must be removed. Heads heated to red hot in a kiln. Welded while red and very slowly cooled. Then heads cut for inserts and seats cut. Finally chambers shaped and heads milled flat.

Lots of labor and cheaper to buy aftermkt heads..
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Old 02-25-2012, 11:15 AM
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i bought 3 sets of factory vortec heads all cracked.i am done with then. so i went and bought a set of rhs heads. i made some good numbers with my setup on the dyno with rhs heads
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Old 02-25-2012, 12:02 PM
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Thanks for the info guys,will get them magnafluxed,cant believe so many are cracked! Wont bother buying an intake manifold until theyre checked,we pay a lot over here(uk) for vortec intakes oh well,thanks for replies!
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Old 02-26-2012, 08:21 AM
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I definitely wouldn't buy an intake until you have them checked, I've been junkyarding 4 times over the past 2 weeks trying to find 1 good head to finish a set. In all I'm out a couple tanks of gas, 10hrs of my life and about 125 dollars in heads for the 3 bad ones I've picked up.
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Old 02-26-2012, 02:44 PM
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yes mate,I know what you mean,if these are cracked I will go with a set of aluminium heads,and save some weight!
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Old 01-13-2013, 09:33 PM
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vortec head crack location

would some one here show me the picture where the crack on vortec head,because i had set vortec casting 906,but i dont know how to find the crack on these head,thanks
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Old 01-13-2013, 09:36 PM
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wuold you tell me how to find crack on my vortec head
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Old 01-13-2013, 09:39 PM
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vortec head crack location

would some one here show me the picture where the crack on vortec crack because i had set #906,i want find crack before i install on my block thanks
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Old 01-13-2013, 10:27 PM
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Quote:
Originally Posted by chevy327 View Post
would some one here show me the picture where the crack on vortec crack because i had set #906,i want find crack before i install on my block thanks
Red lines show where to look for the more common cracks (this is an end chamber, you're much more likely to find the center chambers cracked). I have no info on them cracking between the valves on the center chambers because they lack a heat crossover like the earlier heads, but I'd still check there.

Best bet is to haul them in to the machine shop and have them checked. You need to know if they're flat or not, and you should CC the chambers so you know what the compression ratio will be.

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Old 01-13-2013, 11:09 PM
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thank i will take them to mechine shop for sure,did you know how much it cost to check crack
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Old 01-14-2013, 08:12 AM
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Ballpark $50-$75 should get you a thorough inspection including deck flatness. I would clean it real well before taking them in, or plan to have them tank or cook them before inspecting. Hopefully that'll be deducted from the cost to rebuild them if you have them done at the same shop.

There are good machinists here (BOBCRMAN has posted to this thread already) that can tell you what they do, I'm going by what my shop does and that might not be what they all do.
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Old 01-14-2013, 09:04 AM
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they are 299.oo new,, with valves and springs..
I'd not even look in a j/y
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Old 01-14-2013, 09:32 AM
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$299 new, per head. A short page on the Vortec head is here.
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