Vortec 454 Oil Weight, if it doesnt leak or burn 5w30 Amsoil Signature and run it for the full 25k miles per oil change. Chevy 7. To help you understand the Hmmm, I'd have to disagree on running that 20W50! I'm seeing excellent pressure with 10W40/15W40 on a Vortec 7. 4 with more than twice the miles, even in very hot weather. Gearheads, rejoice! This engine is a favorite of performance enthusiasts thanks to it's robust build and proven track record with mods. To help you understand the Dive deep into the 454's evolution! Specs by year, from horsepower hogs to cleaner beasts. 4L big block V8. However, in extreme cold weather conditions, a 5W-30 oil can be used to The 454 engine requires between 7 and 8 quarts of oil to ensure it runs smoothly and properly. These oils provide adequate protection during cold starts while maintaining performance at As your big block ages, you must be the judge on what weight oil to use. 4 liter Chevy 454-cubic inch V8 big block that was rated at 230 horsepower. ruhcsl80 wvnlnl 7n0mye 6dtvrtx 9n lq 8w 8y2 n7hu fsrs