Blaney finished sixth and scored eight stage points in a race narrowly won by Kyle Larson from Christopher Bell, but the Team Penske driver was later disqualified when his #12 Ford Mustang failed post-race inspection.
The reason behind the initial disqualification was for violating NASCAR Rule Book section 14.11.3.5, which lists the minimum extended damper lengths for each shock.
The sole remaining Penske driver in championship contention, Blaney was 56 points below the cut-line in the playoffs after being disqualified, but is now back to just 17 points out after having his original finish reinstated. He jumps back ahead of fellow Ford driver Chris Buescher and now sits seventh among the eight remaining title contenders.
The Talladega winner faced the scenario of needing to win either of the two remaining Round of 8 races at Homestead and Martinsville to secure a berth in the Championship 4 race at Phoenix.
A statement from NASCAR said: “After further review of the inspection process throughout this weekend’s events at Las Vegas Motor Speedway, NASCAR has rescinded the No. 12 disqualification penalty.
"Monday morning during its race weekend debrief, NASCAR discovered an issue with the damper template used for inspection.
"NASCAR then conducted a detailed investigation, and has restored the #12’s stage and race finishing positions from Sunday.
"NASCAR has taken internal steps to remedy this issue moving forward.”
Source: Autosport