1991 4.3 V-8 caprice engine questions - Chevy Impala SS Forum
 
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post #1 of 5 (permalink) Old 12-24-2001, 08:02 AM
Capriceclone
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how much horsepower does the 4.3 V-8 have? and does any one have any good ideas on hopping up a 4.3L V-8 engine? [img]tongue.gif[/img]
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post #2 of 5 (permalink) Old 12-24-2001, 11:32 AM
patgizz
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91 should be a 305(5.0) if its base - 4.3 engine(L99?) wasnt till 94...

look at your emission sticker on fan shroud, RPO list under trunk lid,,, i bet ya see a "L03" there
post #3 of 5 (permalink) Old 12-25-2001, 06:45 PM
ssyclone
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Hey patgizz, do you have any pics of your 91 caprice. I have the same and am trying to see different mods. Thanks.
 
post #4 of 5 (permalink) Old 12-25-2001, 09:03 PM
cheavy
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Assuming that the 8th character of your VIN is "W":
200 hp @ 5200rpm, and 245 lbft @ 2400 rpm. Except for the cam and valvetrain, most of the mods that apply to the LT1 apply to the L99.
post #5 of 5 (permalink) Old 12-28-2001, 08:06 AM
Hagar
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Most mods work, if I did it over again on the "ssoapbar" for power mods, in order

1. cold air intake
2. exhaust
3. higher stall converter
4. gears (3.73) with posi unit from an Fbody
5. lt1edit or vendor reprogram
6. lt4 knock sensor

The suspension mods would be
1. body bushings
2. swaybars ( my 94 did not even have a rear one!)
3. springs/stiffer shocks
4. LCA's
5. stainless steel brake lines for front as we only have drums in the back

Keep in mind you will never really make up for the lack of cubes totally vs. a real LT1 but you get close to a stocker and still get better MPG

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