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GM 12345724
Notes: Fits both coupes and convertibles
making this manifold an excellent choice for both restoration and performance-minded Buick fans
Great for running headers with close tolerance
Trust in our durable construction
14mm Thread, .708 in Reach, Tapered Seat - Single 1990-pontiac-firebird-esi3548487 GM 12345724ACCEL's patented race proven spark plugs in a Shorty configuration. The overall length has been reduced 3 16 in to 3 8 in (depending on the specific spark plug) to gain critical air gap between the spark plug boot and the exhaust manifold or header tube. This helps eliminate burning the spark plug boot or dimpling the header tube. The shorter spark plug length also can make it easier to install an remove the spark plugs in certain applications where
