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JTR manual says to use 1982-92 camaro manifolds--NOT high performance models which hang lower and cause problems with firewall and starter. Also if you are using 1987 or newer heads,then you will need 87 or newer exhaust manifolds due to exhaust port change.
 

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I had the pre-87 manifolds on my '94 heads on my daily driver for 5 years and never had any problems,but i've heard that they sit too close to the rubber valve cover gaskets and will melt them.
 
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