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Does anyone know of a replacement manifold to make the TPI intake work with the Vortec Heads?
 

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I looked into this for my 89 GTA.I found a manifold it was either TPI specialties or Edelbrock.Ether way,the biggest issue is that you will have to run an external fitting for the EGR since there is no way to hook it up to the plenum in the same way as the stock heads,and the TPI setup really requires EGR to work properly,so there is no getting around it as far as I know.Other things I looked into were ther runners which are a required upgrade to get the most from the intake,the plenum is fine,but you should port match it to the runners,the 350 throttle body is also more then large enough despite what some TPI experts seem to think.

Good luck.
 
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