What grade of gas does your large gas engine require

[invmartyc]

With the big V-8 and V-10 engines do you have to burn a higher octane than regular unleaded? Back in the days of muscle cars you had to burn premium.

Does that apply to big blocks in RVs?

[Coyote74]

My 8.1 GM workhorse uses regular gas. I had a 454 chev used reg and 2 workhorse over the years all ran fine on reg gas. East coast, south and north plus Midwest areas.

[Effy]

87

[RetiredBob]

No, 8.1L calls for 87 octane.

[fourmat]

the premium requirement in old big blocks was due to compression ratio and carb the V10 has EFI fuel management and runs on regular