Slant 6 most mpg's
what would be the best compression ratio meaning not too much want to run 87 octane, not looking for hp's just want to get the advertised 36 mpg's
or better.
Depends on the cam, and tuning ability. In my opinion, you will never get 36 mpg, in the real world.
I have a 64 Valiant 4dr sdn Haven't had it on the scale, but a reasonable guesstimate of weight would be 2900-3000 lbs, on the road. It has a 170 built for economy, Bored and honed .060 with a block plate, decked to .005, balanced, mild MP cam (244 dur, 436 lift) Little valve pocket blending. Milled head (can't remember how much) but measured 9.5-1 CR. stock intake and exhaust manfolds, Holley 1 bbl carb. With 3 speed standard trans, got about 28 mpg, with a points dist. I have since added a electronic dist, and HEI. Still need to do a recurve on the dist. With enough initial timing for a good idle, it will ping on 93 octane, at load. That is what I meant by tuning ability. As time permits, after I get the distributor recurved, I plan on a different carb, and larger exhaust. I also have a 4speed OD trans, that I might try. With all these mods, I would be satisfied wth low 30's mpg
