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I don't know how you can tell which valves are sodium filled. If you handed me one of each, I'm sure I couldn't tell you. I don't even know if the part number is visible on them.
A turbo head will have the special exhaust valves; a regular NA head will not have Na filled valves! (Isn't that clever?)
This is just one other good reason why simply bolting on a turbo is not a good idea, and I had forgotten to mention it.
By the way, right near here, in eastern Connecticut, we're lucky to have one of the best turbo conversion shops in the world- Callaway Turbos. These guys did the Callaway Corvettes among many other things. Interesting bits of their legacy show up around here all the time- last week at a yard sale, we came across a '77 BMW 320i conversion car. Supposedly it was capable of 150 mph. Had significant engine and suspension mods, though looked stock besides the BBS wheels and "CALLAWAY TURBO" etched into the quarter window glass... reportedly it was the third car they ever did.
Their approach to conversions was that it had to be an engineered package, not merely a bolt on.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 221K, 88 744GLE- 202K, 91 244 181K, 88 244GL 145K
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