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

A few LT4 questions

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Old May 2, 2011 | 06:54 PM
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Default A few LT4 questions

I am getting ready to replace the LT1 in my 95 vette with an LT4 out of a 97 TA. I see a few differences and am asking if anyone can clarify things for me.

1. Where does the opti vent line hook into the manifold?

2. The PCV routing on this one is different from my 95. The 95 has a U shaped line from a vac fitting to the PCV only a few inches apart. This one has the vac line going all the way to the front of the manifold.

If someone can tell me how the lines are routed on their LT4 I would appreciate it. Thanks.
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Old May 2, 2011 | 08:21 PM
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Originally Posted by aminnich
I am getting ready to replace the LT1 in my 95 vette with an LT4 out of a 97 TA. I see a few differences and am asking if anyone can clarify things for me.

1. Where does the opti vent line hook into the manifold?

2. The PCV routing on this one is different from my 95. The 95 has a U shaped line from a vac fitting to the PCV only a few inches apart. This one has the vac line going all the way to the front of the manifold.

If someone can tell me how the lines are routed on their LT4 I would appreciate it. Thanks.
No LT4 here but I can tell you for the opti you need vaccum, just use a T on any of the vaccum lines on the driver side. Route the line so its out of the way of the throttle cables, etc. The other side gets fresh air, on my 92 I made a small hole in the snorkle that a 90* vaccum fitting sits in.

Can't help on the PCV, all the intakes I have have the U shapped line
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Old May 2, 2011 | 09:41 PM
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Originally Posted by aminnich
2. The PCV routing on this one is different from my 95. The 95 has a U shaped line from a vac fitting to the PCV only a few inches apart. This one has the vac line going all the way to the front of the manifold.

If someone can tell me how the lines are routed on their LT4 I would appreciate it. Thanks.
There's a soft line with a "swivel" fitting that runs from the front center of the intake manifold (under the TB) to a hard line that wraps around the driver's side, to a rubber elbow which the PCV valve plugs into. The other end of PCV valve plugs into the side of the intake.
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Old May 2, 2011 | 10:21 PM
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Thanks RUU. Then the opti vent likely also plugs into one of the fittings on the driver's side of the intake as well. I think I have everything else figured out already.
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