Join Date: Apr 2000
Location: western MA. USA
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Tech question- 1.6L head mods, porting
This is on a 1.6L 8v head, with TBI.
Inside two of the four intake manifold runners, there are "bumps" in the casting near the ends of the ports. These bumps are for vacuum ports that are running beneath them in the casting.
Question: How much of the "bumps" can be taken down without disturbing the vacuum post and f**king up the manifold? We got most of it down, and really opened the port up to match the head, but if it can completely be taken down, all the cooler.