I am finally restoring my first car a 69 FB Conv originally a 350/2b and Turbo 350 and trying to decide what engine to use. I have been waiting 33 yrs to do this and the restoration will include a few modern improvements in the suspension area. The drive train will be a 5 or 6 speed and either a modern LS or a 69 400 RA 4 engine I have had for 33 yrs. My main question is are any of you having any luck with pump gas for the higher compression older performance engines?
My compression ratio works out to 10.0 to 1 for the 400, dished pistons, and Ram Air II heads I have.
I'm actually mixing premium and another gasoline to get the octane up to about 98. Runs well on that mix.
1968 400 Coupe, verdoro green, black vinyl top 1968 400 Convertible, verdoro green, black top 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver)
Running on pump gas was one of my requirements to my engine builder.
455 punched out to 467, E-brock aluminum heads, manifold and carb, roller cam.
490 HP at the flywheel after break-in on the builder's dyno. Runs all day on 93 octane.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
Aluminum hds can go a full point higher cr vs iron. 68-70 round port hds i've had where closer to 68-69cc's vs performance 72cc d-ports(70 #12's excluded). Wouldnt use anything under 98-100 octane. If the engine needs rebuilt, easy to lower cr for 93 octane.
