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Re: 91 4.3l
High Output uses CMPFI central muti-port fuel injection-a 61 psi fuel pressure requirement- recognizable by the intake manifold and air cleaner set-up- the standard uses a throttle body- lower fuel pressure and air cleaner right on top of engine --- after '93 all M-vans were high output......a much better set-up.....
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Automotive A/C Engineer with:
'95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone- blown head gasket
'92 Chevy Lumina Van 3.8L 264k miles
'86 GMC S-15 - 2.8L 154k miles
'86 Buick Park Ave 3.8L 199k miles- my daily driver
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles- my high school car!!
All but the Camaro and Firebird are white....
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