Hi Fellas,I found the post(bellow) which describes the R44LT recomendation can anyone elaborate??It seems ilbl8 is knowlegable,but that would mean everyone has been using the R44 is using wrong plug!!!Thank you for your input. http://www.camaros.net/forum/Forum1/HTML/003322.html
How about you telling us the date code from each head. That will help.
I know for a fact the '70 Z's used #186 heads, screw-in studs/guide plates 2.02/1.60 valves. The stock plug was AC R43. For street driving the R44 works better as it is a hotter plug and will foul less. If you prefer a different brand you can cross reference as John Z stated, he likes the Champions better.
The #186's were also used in '69 on the Z's and lower performance small blocks and came in both the small and large valve set-up. I don't think the screw-in studs came until '70.
You might want to try a few different plugs and heat ranges until you find one most compatible with your engine and driving style. The post you mentioned has a test you can do to see which plug will work best for your heads.
[This message has been edited by 70 RS/Z-28 (edited 02-02-2001).]
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