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02-18-2012, 04:20 PM
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#1 |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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BBC Valve Adjustment Question?
When I adjust my mid 70's BBC valve it runs good for a while then goes back to running the way it did before I did the adjustment! I know it means the 454 has high miles and things are a little worn out but what is it that's worn out? The cam, the lifters, what else can it be?
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02-18-2012, 04:38 PM
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#2 |
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Formerly- 1972SuperCheyenne
 
Join Date: Oct 2008
Location: Wake Forest NC
Posts: 5,782
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Re: BBC Valve Adjustment Question?
How long does it take to start running bad again? Could be cam, lifters, rocker nuts backing off, etc...
__________________
--Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with. |
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02-18-2012, 04:47 PM
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#3 | |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Re: BBC Valve Adjustment Question?
It takes 10 miles or so + or -, never thought about how long but I did notice that some of the rocker arm studs show more threads than others, shouldn't they all be about the same?
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02-18-2012, 04:50 PM
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#4 | |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Re: BBC Valve Adjustment Question?
and some don't seem to make much of a difference in the way it runs while doing the running adjustment procedure!
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02-18-2012, 11:05 PM
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#5 |
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Formerly- 1972SuperCheyenne
Join Date: Oct 2008
Location: Wake Forest NC
Posts: 5,782
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Re: BBC Valve Adjustment Question?
There should be the same amount of threads showing. Sounds like the press in rocker arm studs are pulling out of the heads. Not all that uncommon. Time to upgrade to screw in studs! Fix it before something more catastrophic happens though.
__________________
--Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with. |
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02-19-2012, 12:45 AM
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#6 |
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Registered User
Join Date: Oct 2009
Location: SoCal
Posts: 815
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Re: BBC Valve Adjustment Question?
BBC have screw in studs. Its the SBC that have pressed in studs. Sounds like your hydrolic lifters that might be causing your problem.
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02-19-2012, 05:54 PM
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#7 |
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Formerly- 1972SuperCheyenne
Join Date: Oct 2008
Location: Wake Forest NC
Posts: 5,782
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Re: BBC Valve Adjustment Question?
Ooh yeah, that's true too. Well, sounds like the lifters are dying out on ya. All the more reason for a performance cam swap!
Posted via Mobile Device
__________________
--Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with. |
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