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

zz4 timing cover replacement?

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Old Mar 12, 2007 | 04:36 PM
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Tom 35th anniversary's Avatar
Tom 35th anniversary
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Default zz4 timing cover replacement?

Is it absolutely necessary to change out the timing chain cover on this motor to the old one off of my l98? The only interference I see so far is one bolt that hits the back side of the water pump. I looks like if I use a button head bolt it will clear, then no more issues. Will something else in the install interfere with this cover that I am not seeing? Thanks for any responses guys.
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Old Mar 12, 2007 | 07:53 PM
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Carl Johansson
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Originally Posted by Tom 35th anniversary
Is it absolutely necessary to change out the timing chain cover on this motor to the old one off of my l98? The only interference I see so far is one bolt that hits the back side of the water pump. I looks like if I use a button head bolt it will clear, then no more issues. Will something else in the install interfere with this cover that I am not seeing? Thanks for any responses guys.
Tom,
On mine we used the plastic cover with the integrated gasket. It should come with one of the bolts heads shaved down - I got a new one from Chris May at Superior chevy - on my brothers we tried a chrome one - but it didn't work. The shaved down bolt is their "engineering solution " to the short legged water pump. You could grind down one of the shouldered bolts - but you have to get it pretty thin to fit the water pump - and then it's tough to get a wrench to sit on it if you ever have to change it out (mine developed and oil leak - what a PITA to repair.

Carl Johansson
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Old Mar 13, 2007 | 10:56 AM
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I'm using the plastic timing cover with a short water pump. Had to grind the heads of the bolts on the back of the water pump. Been on two years with no problems.
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