Phantom240
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- Joined
- Sep 28, 2012
- Posts
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I loved my Yellow Top in my 240sx years ago. What's wrong with Optima batteries, sunlit?
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use the strongest high batteries you can fit in your vehicle from interstate or sears. this is where i stand on batterys right now for the near future.talk about a parts misapplication.

I've never seen mating surfaces that look like they were built up with welds, then milled flat. I guess it would make a better seal by focusing more of the force on the gasket directly adjacent to the ports, rather than spreading the force across the entire flange. Every header I've had was flat at the gasket surface.
It depends on the manufacturer, usually the cheap ones do that, the better ones have a flange that is machined like that, the really cheap ones do neither.