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Re: STAGE VI HEADS
[Re: rickb67]
#978522
04/23/11 02:55 PM
04/23/11 02:55 PM
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Joined: Jun 2010
Posts: 3,112
LONG ISLAND
fishy340
master
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master
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
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Quote:
Finally got the 440 to a buddies to change check valve springs and do a leak down. Well the leak do was interesting after roughly 90 passes 6 cylinders are at 15 to 20 percent leakage and 2 are almost 60 percent. The heads don't seem to hold a valve job, anyone else with stage vi or aluminum heads period having a problem. 
you are not the only one with prob's from those heads,my buds a guru w parts,and he told me thats the prob mopar had w those heads...thats sucks man..good luck
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Re: STAGE VI HEADS
[Re: rickb67]
#978523
04/23/11 03:25 PM
04/23/11 03:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Finally got the 440 to a buddies to change check valve springs and do a leak down. Well the leak do was interesting after roughly 90 passes 6 cylinders are at 15 to 20 percent leakage and 2 are almost 60 percent. The heads don't seem to hold a valve job, anyone else with stage vi or aluminum heads period having a problem.
Did you have the valves ground before you put the
heads on.... MP has a bad valve job on most all of
their heads from the factory(if you want to call it
a valve job)
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Re: STAGE VI HEADS
[Re: rickb67]
#978525
04/24/11 08:31 PM
04/24/11 08:31 PM
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Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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the intake seat inserts often "move" on stage 6 heads.
either intake or exhaust can be the culprit, but its usually the intakes that have the issue.
if the heads have had intake valves larger than 2.14 installed, and had the seats cut accordingly, then you can pretty much count on the seats moving.
recheck the biggest offenders and see where it seems like the air is going.
if its out the intake manifold......then the seats have moved.
the only real cure is to install new, bigger seats with more of an interference fit.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: STAGE VI HEADS
[Re: rickb67]
#978528
04/25/11 10:54 AM
04/25/11 10:54 AM
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Joined: May 2003
Posts: 13,200
aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,200
aZLiViN
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Quote:
Well that figures.  If i sent you these heads can you fix them and how much would it cost. 
Have him port them while they are there! You won't be sorry!! (I certainly wasnt!!)
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R&J Performance in Hudson,Iowa did my Stage VIs..But you would have to wait a long time. He is up to his ears in S&S Pro Stock Harley heads now...There is also a guy in Carrol,Iowa that may be able to do them. I will see if I can find his number...Ted