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These throttle bodies have provisions for either LS1 or LS2 mounting bolt patterns. They use a LS1 style TPS and 4-wire stepper motor IAC. They have been designed with the addition of an idle bleed screw to offer better idle control than other 90mm throttle bodies on the market. The bleed screw can be used to create a base amount of idle air flow instead of throttle tip-in, leaving the TPS signal unaffected. Ideal for use with Edelbrock Pro-Flo XT intake manifolds ED7135, ED71353, ED7137, ED71373, ED7139, ED71393, ED7144 and ED71443.