<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Mr70</div><div class="ubbcode-body">I'm running a dead stock 1970 L-78 with hardened valve seats,11-1 compression,R43T plugs & A.I.R.,with the factory timing settings in my Chevelle.
I use 100 octane unleaded gas found at certain stations around Chicago,with no pinging,hesitation or run on at all.
</div></div> I like it.That car looks very clean. I have a 1970L78 block for sale. Date Sept. 1969 CKO STd. Bore