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Old 07-02-2013, 09:13 PM
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Need BBC valve adjusting help, please.

Doing a rocker swap on a 454 and I've always adjusted valves after a new cam/lifter install with the lifters empty. Since these lifters are pumped up, is there a different way I will need to adjust them, since they're already pumped up, or just spin the p/r until no resistance then 1/4, 1/2 turn or so? Thanks for the help!!

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Old 07-02-2013, 10:36 PM
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wikilink check it for more info


http://www.crankshaftcoalition.com/wiki/Rocker_arms
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Old 07-03-2013, 01:50 AM
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There's no difference in how you adjust them. Like you said: Zero lash plus how much preload you want (1/2 turn, etc.). More wiki info here.
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Old 07-03-2013, 07:44 AM
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Thanks to you all for the help. The main reason I was curious, is I had tried to spin the P/R until resistance was gone then adjusted 1/2 turn, but came back 15 minutes later and they'd be loose again. I'm assuming the oil was being pushed out of the p/rods.....? That's when I started questioning myself on my procedure. I need to keep doing them until the oil is gone from the lifters and then it should be good, I hope.
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Old 07-03-2013, 09:06 AM
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Quote:
Originally Posted by flyin99 View Post
That's when I started questioning myself on my procedure. I need to keep doing them until the oil is gone from the lifters and then it should be good, I hope.
You don't continue adjusting as the lifter leaks down. Do the initial adjustment with the lifter plunger at it's highest position, moving the pushrod up and down is best to find zero lash, then the 1/4 to 1/2 turn. Lock it down and leave it alone.
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Old 07-03-2013, 12:20 PM
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Quote:
Originally Posted by flyin99 View Post
I had tried to spin the P/R until resistance was gone
Newbies will invariably get the valves too tight by using the "spin the pushrod" method of taking up slack and should use the "jiggle up and down" method that is bulletproof. Please read up on valve adjusting here.....
http://www.crankshaftcoalition.com/w...stment_SBC/BBC
If you build motors day in and day out, for a living, then you will have the touch required to take up the slack with the spin method. If you are a newbie or build a coupe of motors a year, the jiggle method is your friend.
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Old 07-03-2013, 11:13 PM
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Quote:
Originally Posted by flyin99 View Post
I need to keep doing them until the oil is gone from the lifters and then it should be good, I hope.
Adjust them ONCE, don't keep readjusting until the lifters are bled dry- if you do the valves will all be held open and the engine will never start!

A post on a similar deal is here.
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Old 07-04-2013, 06:49 AM
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Got em, thanks! I didn't have internet at the lake (engine is in a boat) and just adjusted them once, as you all suggested........fired right up and is quiet. Appreciate the help!!!!!
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Old 07-04-2013, 10:16 AM
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A BBC powered boat at the lake. Life is good, it would seem!
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Old 07-04-2013, 03:48 PM
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Two thirsty 454's....lol. I'm not sure if the fun is worth the fuel cost.........................thinking............. .....thinking..........'tis fun though Thanks!!
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Old 07-04-2013, 03:54 PM
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sounds like an expensive catfish puree!
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