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can a different temp plug reduce my pinging? 140-160

Well, the pinging is gone, unless the car sits for more than a minute at a traffic light or anywhere else, the temp will go up as it sits, and it'll go up just enough(not necessarily that much) that it'll ping (not under light loads) until it cools back down... So basically it's on the verge... Which is annoying considering it's only at about 10 degrees advanced...

Do the older motors have different cooling systems at all? Like this 71 compared to my 74? I know that my new motor has quite a bit higher compression, so that would account for most of the heat increase, but it seems like a bit much, but maybe not. I might just not be used to the higher compression?
--
Kyle - '68 Volvo 142 w/71 b20b and m40...






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