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I'm looking at used injections. I have an old cast iron stock chevy motor.Can someone clarify 23 degree headed injection, raised port injection, injection for -12 headed motor....etc. what is a 23 degree, raised port or -12 head? And where are the differences actually found or located? I'm old school and regretfully never progressed with the times. Hope my questions make sense. Lots of knowledge on the board. thanks for any help or clarification. rc
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