C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

-=-= valve cover clearance quesitons LT1 -=-=-

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Old Aug 3, 2003 | 04:54 PM
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From: stop the fun suckers
Default -=-= valve cover clearance quesitons LT1 -=-=-

At what point to you need to grind the drip tabs off/down? I think my arms might be banging the valve cover.. how can I tell?

i'm using the factory 1.5 ratio rockers.. and the car specs are as follows...

Gross Valve lift intake=.495 and exhaust=.503
with a lobe lift of intake=.3300 and exhuast=.3350
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Old Aug 3, 2003 | 06:55 PM
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Default Re: -=-= valve cover clearance quesitons LT1 -=-=- (BluByU)

I assume you are talking about roller rockers. If so, take a dremel tool with a cutting wheel and cut the drip tangs off. If they are stock stamped OEM rocker arms, there shouldn't be a problem.
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Old Aug 3, 2003 | 06:56 PM
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Default Re: -=-= valve cover clearance quesitons LT1 -=-=- (BluByU)

You should be OK if you are running the stock rocker arms.

Why not pull the vavle covers off, just to make sure. The drip tabs should show damage if the rockers are hitting.
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Old Aug 3, 2003 | 07:26 PM
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From: stop the fun suckers
Default Re: -=-= valve cover clearance quesitons LT1 -=-=- (BluByU)

pulled the covers off.. no signs of obvious damage... maybe on the very edge of the drip tab maybe the last 1/32" or so there is some scuff marks... but nothing big.. i also ran the motor with the covers off and noticed no change in noise.. also all the rockers see to be getting good action.. and when they are in the unloaded postition i can move the pushrods with my fingers.. but notice some resistance..

:confused:
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Old Aug 3, 2003 | 07:34 PM
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Default Re: -=-= valve cover clearance quesitons LT1 -=-=- (BluByU)

If you're running with the covers off, that is the perfect time to adjust the valves. Loosen the adjuster until clacking starts and slowly tighten until it stops, then turn 1/2 more. This way is better than trying to "feel" the pushrod resistance to turn. What kind of valve springs are you using? If they are OEM they might be binding. Go to the LT-4 springs.
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Old Aug 4, 2003 | 08:16 AM
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Default Re: -=-= valve cover clearance quesitons LT1 -=-=- (Strick)

I checked everything with the valves... a-o.k.

The valve springs are matched to the cam shaft and are NOT OEM.

aghhh.. frustrating..
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