Anyone broke the head where the exh. manifold bolts on?

BlackStroker

BlackStroker

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Mar 28, 2007
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Ran one good time down the track at the test and tune in Warsaw and found today that the head is broke off and cracked where the exhaust manifold bolts to the head. #1 and #2 top of exhaust port is broke off, #3 and #4 are cracked, #5 and #6 I can see nothing wrong with. Same turbo and manifold as last year. Only change was I did some port matching on the exhaust side and added 13mm pump...?????
 
must be some serious drive pressures going on there :charger:

post up some pics!
 
I have seen the ears break off before on the heads. Get the 3 piece manifold and it will help.
 
if you're running a stock manifold, you should release and retorque the manifold once a year IMO

my 97 developed cracked ears on #1 and #2... I hit them with a MIG gun with the engine in the truck, and it stopped the leakage :D
 
yea, it was all on the top ears that broke off, I thought the manifold would have cracked or broken before the head? After looking at things closer, you can tell this prolly happened after the pull because there is no soot around the cracks.
 
I don't think the porting has much to do with it, this is pretty common on all 12 valve motors. Sucks dude. :bang
 
drilling the mounting holes out larger on the manifold makes more room for expansion
 
if you ported the snot out of the head and made the walls thin, it could have caused the problem...

wollowing out the holes on the manifold doesn't really make a difference if the bolts are bolted tight... it's still going to pull on the head.
 
sdubfid said:
drilling the mounting holes out larger on the manifold makes more room for expansion
Click to expand...


Of course doing that will probably crack the manifold. You can double up the SS gaskets that will help to allow the manifold to slide.
 
well sounds like I need a manifold....what to do with the head, it is cast iron right? didn't think you could mig weld that?? You can stick weld right?
 
BlackStroker said:
well sounds like I need a manifold....what to do with the head, it is cast iron right? didn't think you could mig weld that?? You can stick weld right?
Click to expand...

you can mig weld on cast but you have to use a torch to heat the metal up cherry red before you weld. so heat an inch, weld an inch, etc.. but I would pull it off to do that, you will be melting hoses and other stuff with a torch in there. Or just buy another one
 
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