We've managed to run mid 11's in full street trim for several seasons now, on 89 octane fuel in our daily driven car. Full/quiet exhaust system, stock type idle quality, iron intake, q-jet, 3.42 gears, 10" converter, no traction bars of any kind, on DOT tires. It took us several years to get there.
When we first installed the 455 engine, it ran 12.90's. We've tweaked and tuned it all the way to 11.50's, and that was with the DA up near 4000'. The biggest gains to performance were NOT from the engine. The fuel system was by far and above the biggest improvment. We also saw a couple of tenths going from 2.5 head pipes to 3" with a custom "H" pipe between them. The KRE heads were worth a solid two and a half tenths and 2mph.
The most recent improvment was from a custom HR cam with specs based on the RAIV grind. We've only been out 3 times with it, but it's already running quicker in hot/humid weather than we ran in near perfect conditions with the flat RAIV grind.
Folks, running this quick just doesn't fall in your lap when you install a big high torque engine. It's about the combination of parts, the engine is simply part of a well thought out plan. Sometimes, as it did with us, it may take several years to figure out all the fine details to get everything working together for really quick runs......and did I mention parts breakage? To date we have broken EVERYTHING behind the engine, at least once!......Cliff
__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
|