{"product_id":"throttle-body-spacer-for-gmc-jimmy-1988-1991-4-3l","title":"Throttle Body Spacer for GMC Jimmy (1988-1991) 4.3L","description":"\u003ch2\u003eBillet Throttle Body Spacer for 1988-1991 GMC Jimmy\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eOptimized Intake Velocity:\u003c\/strong\u003e Increases plenum volume between the throttle-body injection assembly and intake manifold to improve off-idle throttle response and low-rpm torque delivery.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jimmy Airflow Restriction\u003c\/h3\u003e\n\u003cp\u003eFactory 4.3L TBI setups suffer from abrupt intake geometry beneath the twin-bore throttle unit. This short transition creates localized air turbulence directly at the throttle plate exit, compromising low-rpm cylinder filling efficiency and air-fuel atomization. Additionally, direct conductive thermal transfer from the cast-iron engine block into the intake assembly causes rapid heat soak, thinning the intake charge density and dulling throttle response under heavy towing or off-road load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eCNC-machined from solid 6061-T6 billet aluminum, this spacer lengthens the intake runner tract and expands functional plenum volume. The continuous bore geometry smooths velocity transitions, promoting thorough fuel droplet suspension before mixture distribution into the cylinder runners. Anodized for chemical and heat degradation resistance, the structural billet material isolates excessive manifold heat, resisting vacuum warping and maintaining strict dimensional stability across rigorous thermal cycles.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1988-1991 GMC Jimmy\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4.3L LB4 V6 \/ S-15 Platform\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e160 hp \/ 230 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1988-1991 GMC S-15 Jimmy Base (4.3L V6 LB4 TBI)\u003c\/li\u003e\n  \u003cli\u003e1988-1991 GMC S-15 Jimmy Sierra Classic (4.3L V6 LB4 TBI)\u003c\/li\u003e\n  \u003cli\u003e1988-1991 GMC S-15 Jimmy Gypsy (4.3L V6 LB4 TBI)\u003c\/li\u003e\n  \u003cli\u003e1991 GMC Jimmy SLE \/ SLS (4.3L V6 LB4 TBI)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe GMC Utility Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered for high-torque utility demands, this direct-fit upgrade provides reliable low-end pulling power essential for trail navigation and towing, maintaining factory vacuum specs without electronic calibration.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50498978021624,"sku":"DS-E7589OTTN","price":63.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/throttle-body-spacer-for-gmc-jimmy-1988-1991-4-3l-1.jpg?v=1789276102","url":"https:\/\/performancechiptuning.com\/products\/throttle-body-spacer-for-gmc-jimmy-1988-1991-4-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}