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A Flame Arrestor is REQUIRED for marine installations
Holley’s LS covers use proven OE style baffles and vents
Will Pass Most Smog Emissions: Yes
boost control solenoids
BTR 660" Lift Dual Spring Kit (Titanium Retainers) A Flame Arrestor is REQUIREDSpring specs are 155 lbs @ 1. 780", 380 lbs @ 1. 180", 400 lbs @ 1. 130, coil bind @ 1. 070" This is a drop in spring kit for all 15 degree LS heads including LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 LSA, etc. This kit will not fit LS9 engines
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