Bullman Posted August 1, 2001 Share Posted August 1, 2001 Does anyone know the internal diameter and the external diameter of the ford x-flow 4 into 1 competition exhaust manifold-primaries pipes.Also the internal diameter of the collector outlet.Thankyou in anticipation Bullman. Bullman Link to comment Share on other sites More sharing options...
Mat Norris Posted August 2, 2001 Share Posted August 2, 2001 Bullman, I seem to remember 31 or 32 mm diameter (when ordering large bore gaskets) is the internal diameter. Best check though if it is super critical. Mat Link to comment Share on other sites More sharing options...
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