FricFrac Posted April 30, 2014 Share Posted April 30, 2014 Tried searching and all I come up with on the P90 heads is the intake manifold port matched but the exhaust ports are square rather than port matched to the diamond (?) shaped exhaust manifold and gasket. Is there a reason why people aren't port matching the exhaust for the turbo manifolds? Is there not enough material before you hit the water runners inside the head? I'm assuming you would want to port match on the exhaust side as well but all the pics I can find are not port matched to the gasket/exhaust manifold. Quote Link to comment Share on other sites More sharing options...
Xnke Posted April 30, 2014 Share Posted April 30, 2014 It isn't really helpful, nor is there material to open the port that wide if you wanted to. Look at photos of professionally ported heads for your answers. What you take away from the photos is up to you, but there are a LOT of details that can be gleaned from a picture....and some very important ones that cant! Quote Link to comment Share on other sites More sharing options...
FricFrac Posted May 1, 2014 Author Share Posted May 1, 2014 I assumed that there was a reason it wasn't done. Is there no issue going from the square port to the diamond shaped log manifold? I thought that abrupt transition was detrimental to flow Quote Link to comment Share on other sites More sharing options...
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