L99 4.3 V8 - Chevy Impala SS Forum
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post #1 of 15 (permalink) Old 10-07-2009, 07:31 PM Thread Starter
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L99 4.3 V8

OK, Ive checked the search link and found nothing. I Googled it still, not what I'm looking for.

I found a 96 Caprice with a 4.3 V8. My question is:
What are the stats for the 4.3 liter V8? Any known problems? Is it worth buying one of these cars with this motor? Are the transmissions different from the LT1's? What gear do these cars have w/ the 4.3? Any thing else you can think of about this motor? Thanks for your expertise.
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post #2 of 15 (permalink) Old 10-07-2009, 07:56 PM
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hmmm 4.3 v8 ?

not really , 4.3 is a 6 cylinder

1996 dcm SS -355 forged internals, t-66, nx , 3.42s ........
1971 monte carlo- bunch o crap , hope to be boosted lsx soon
1997 buick regal GS- gen v supercharger swap , n* throttle body , intercooled, headers ....etc
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post #3 of 15 (permalink) Old 10-07-2009, 08:01 PM Thread Starter
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No, actually there is a 4.3 V8. Check it. It's the L99 option code.
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post #4 of 15 (permalink) Old 10-07-2009, 08:05 PM
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wow i apologize !

i did not know that

1996 dcm SS -355 forged internals, t-66, nx , 3.42s ........
1971 monte carlo- bunch o crap , hope to be boosted lsx soon
1997 buick regal GS- gen v supercharger swap , n* throttle body , intercooled, headers ....etc
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post #5 of 15 (permalink) Old 10-07-2009, 08:10 PM Thread Starter
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No problemo mon.
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post #6 of 15 (permalink) Old 10-07-2009, 08:12 PM
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Same externally as an LT1. Good motors, just smaller displacement and less power than the 5.7. Usually will have a 3.23 gear(GU5 option code), and a little lighter duty 4L60E.

Dave MacDonald
66 Impala LT1/C950/700R4(sold 07/2011)
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post #7 of 15 (permalink) Old 10-07-2009, 08:35 PM
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L99 4.3L V8 has 200 hp @ 5200 RPM, 245 lb-ft @ 2400 RPM.

1994 L99's were equipped with either a 2.73:1 or 3.23:1 rear axle.
'95 and '96 got either the 2.93:1 or 3.23:1 axle.

The only real transmission difference is that the L99 4th gear servo is not as stout. This is easily changed.

If you're not looking for performance, the L99 is a good and economical engine. If you want power, LT1 is going to make you happier.

2005 Pontiac GTO
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post #8 of 15 (permalink) Old 10-07-2009, 08:42 PM Thread Starter
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Talking

Are the rearends all posi or an option?
And how do you tell what gear it has?
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post #9 of 15 (permalink) Old 10-07-2009, 09:36 PM
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Quote:
Originally Posted by Turboalex View Post
Are the rearends all posi or an option?
And how do you tell what gear it has?
Posi was optional on all B-bodies, with the exception of B4U-package Caprices and the Impala SS.

All axle codes are listed on the SPID tag on the backside of the trunk lid; they start with G. G80 = limited slip axle.

2005 Pontiac GTO
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post #10 of 15 (permalink) Old 10-08-2009, 02:13 AM
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Another thing to consider, is that a majority of the L99 cars came with the tooth pick 7.5" 10 bolt. Lucky an 8.5" 10 bolt from an L99, 9C1, or any LT1 powered B-body will bolt right in, with the LT1 driveshaft. If the L99 car is a nice car, clean, and decent price, I would buy it. You can always pull the L99, and drop a LT1 in. It's as if you were pulling the motor, painting it, and dropping it back in. Everything will bolt right up.

I have been tempted to look for an L99 Caprice as a driver. I have never even driven one. Al of the ones I have are LT1 cars.

~Cory Magner "My name is Cory, and I'm an addict."


95 DCM Buick RMS. 14.21 at 91.79 "Jesus", Motor Swap at 85k
95 DCM Buick RMS 13.52 at 99.12 Buffman's car, Cracked Piston at 180k
96 DGGM Buick RMW 263k Stock Tranny

RAISS, Tri-Y's, Pypes X pipe, Spintech Prostreets, 3000 Edge, 3.73's, Eaton Posi, and the rest of the Bolt-ons. Fried #7 Ring.

And 5 other LT1 B-body's... Is there Rehab for this Sh*t?
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