Need a plan - component selection for restoring 68 340 that runs on 91 oct

Wyrmrider said

glad your octane is consistent nm out here in CA it varies all the time and especially "summer blend" vs winter blend"- gotta build for worst case for pump gas

Click to expand...

Yeah, I had not thought of the summer blend crapola.... we live away from all that nonsense. 'Round hyar, the fuel usage has made old/bad gas at the pump pretty much a non-issue.... You gotta realize that I come from an area and time when I can remember my dad getting fuel from a station with the OOOOLD pumps, where the first attendant hand-pumped fuel up into the glass container up top..... LOL

Using a lazy cam in this case is actually an advantage.... it lowers the 'area under the curve' and thus lowers cylinder filling to some degree, and that in turn lowers 'effective DCR'....which jives with the matter of 'leaving torque on the table'. So my reasoning for the older style 340 cam in this case was to make the engine better for poorer octane fuel.