Correct. On the carbureted engines used in medium duty trucks and marine applications vacuum advance was often replaced by a flat plate. There are aftermarket copies available. If you do a search for HEI vaccum advance lock out plate you're likely to find a number of vendors.I'm curious why he completely removed the vacuum advance unless its for asthetics? I mean if you dont hook it up, it wont be used right?
I'd like to suggest using a throttle body from a 2.8 powered vehicle for your conversion. With the large throttle bores of the 4.3 and V8 throttle body and the relatively low air demands of the engine it may be more challenging to tune small changes in throttle angle. Additionally you will need to work to get fuel delivery correct at idle and low rpm due to the amount of fuel delivered by the injectors. The 2.8 / 3.2 throttle body has much smaller bores and it already includes injectors sized appropriately for a lower horsepower engine.
If you need a really long throttle cable look for one from a late '80s to mid '90s van. The van wiring harnesses are very long also because the ecm was mounted under the driver's seat.the 91 truck 350 throttle cable is extra long as well
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