Originally Posted by Chevelle SS 396/375
Maybe this has been covered, but I didn’t see it: what are your plans during the L78 rebuild to address running it on current premium pump gas with 93 octane? When I had my original ‘67 L78 Sunoco 260 (102+ Octane) was all I used! Ha! I know this must be a real issue these days.
I am contemplating building an L78 to have it ready when I find a suitable ‘67 Chevelle to put it in.
The car no longer has the original motor... I did have a date-correct, legitimate '66 L78 for a while, but I ended up selling it 15+ years ago ( it would never be original, and I was offer big money for it). I only want it to "look stock"... There is no way I am going to run 11:0-1... 91 octane is the highest around here, so I want to limit it to that.
I currently have a '66 396, bored to a standard 427 with oval port heads and the L78 "069" aluminum intake and freshly rebuilt, service-dated #3613 carb. Fired it and idled for 20 minutes, about 5 years ago... That will likely be the current engine...
I debated long and hard about headers vs stock manifolds... I decided to run the stock manifolds since I have a nice set just sitting for 20+ years... For exhaust, I am going to go with the "OEM-style" from NPD... Its under $400, including the shipping. Just want a "stock" look, but I don't need concours perfect (like Waldon or Gardner)... Its supposed to have the behind-the-wheel exits which is what I want...
A few years ago, I picked up a decent "core" 454 shortblock, so maybe I'll build that... I have std/std steel crank (polished and wet-mag'd), and am considering building a "427"... And of course, I have been thinking about a Mark Jones motor... I spoke with Mark once, and he did not seen to interested in what I was looking for.
Most likely it won't be driveable until next spring anyway...