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Ultimate Diesel Builder's Guide - - Horse Power -

To match port on the ex­haust side, use an ex­haust man­i­fold gas­ket as a tem­plate. Once done on the head, you can check the ex­haust man­i­fold and make sure it's go­ing to match the head. It's OK for flow if the port run­ning is smaller in di­am­e­ter than the ex­haust man­i­fold but not vice versa. You can grind the flat spot on the floor of the ex­haust port at the outer edge but take care as you move in or you will end up in the water jacket. This is one as­pect of port­ing most DIY peo­ple can do.

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