Throttle Body Spacer
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Throttle Body Spacer
My '85 F-150 is an 5.0 302 with EFI. They only make throttle body spacers for carbs for that year since EFI was only in option for the '85 and did not become standard until '86. Would a throttle body spacer for an '86 fit my '85?
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Joined: Apr 2008
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Depends on what kind of spacer it is - you want one with a smooth bore, it's used to increase the effective length of the runners, making for some increased low-end torque. A spiral-bore spacer like those air-raid ones will only mess up your airflow - they are designed to create turbulence to aid in fuel atomization, the problem is they create the turbulence right at the TB, and fuel injection happens way further down near the cylinder heads, so while the whole idea is very feasible for TBI systems a MPFI will not benefit anything from it. The spacer that does work pretty good is the intake spacer, it's a phenolic spacer that gets sandwiched between the upper and lower plenums, it also increases runner length, but it also limits amount of heat transferred to the upper intake, thus making for somewhat cooler air charge entering the cylinders.
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