Rules | Mid-America Stocks (midamericafactorystocks.com)

Arrowhead Speedway RPM rule

Option 1 - No RPM Limit but must meet all above listed engine rules including vacuum rule

Option 2 – 6,500 RPM Limit if all above listed engine rules are met with exception to vacuum rule

Option 3 – 6,200 RPM Limit with 602 Crate option…Crate engine must remain sealed.

NOTE: If you utilize option 2 or 3 then you must use MSD #8728 or MSD #8727CT for rev limiting. Rev-control units must be unaltered and mounted under the hood on engine firewall and accessible for inspection with rev limiter facing upward.