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4.3L "Baby LT1" V8

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OK, I did some quick browsing of that police car book and it says the 1994-'96 4.3L V8 displaced 265 CID and had the same bore X stroke dimensions as the original smallblock 265 engine of 1955-'57 vintage (3.75" X 3.00"). Performance in the big boat Caprice was "reasonable"; something like a 10.5 second 0-60 time with quarter mile runs in the high 17s. I'll post the exact specs when I have more time.

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Can't believe I missed this thread. :) The 4.3 V8 was the standard engine in the 94-6 Caprice's and not offered in any of the other B/D cars. It's found in quite a few 9C1 cars for LEO departments who didn't want to spend the extra money or didn't see the need for the LT1. Look at it this way, even this little V8 put out similar horsepower to the 5.7 throttle body injected V8 in the 93 Caprice.

Is it slow? Compared to the LT1 sure! But still respectable for a car of it's size and at least as powerful as the 5.0/5.7 combo it replaced. Plus, I've known people who can push close to 30mpg highway with the 4.3 engine.

Sad thing is, quite a few Caprice newbies get suckered into buying one of these because unless you know what to look for (VIN, SPID, exhaust) it's almost impossible to tell the difference. Underhood, the L99 and LT1 look identical.

I've heard stories of mechanics insisting there is no such engine and since it's a 4.3 displacement, it must be a V6. :rolleyes:

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Oddly enough I've actually seen quite a few of them, we have several customers with old Caprices and all of them have the 4.3. I remember the first time I had to look up parts on one and was confused by the 4.3 with the engine code W, because I'm so used to looking up parts on the Vortec 4.3 V6 with engine code W.

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The L99 code W 4.3 liter 265 V8 appears in the majority of 94-96 Caprices that I have seen or know people to have owned in the past. I have driven tons of them as my best friends dealership used to sell them like crazy in the late 90's when gas was still cheap. It made 200 HP and 245 torque, was tied exclusively to the 4L60 4 speed tranny and in 94 used 2.73:1 rear gears. 95/96 saw a change to 2.93:1 rear gears as std and when you ordered limited slip a 3.23:1 ratio was thrown in. I have timed these cars myself around the low to mid 9 second mark pretty consistently in the 0-60 run. They were also capable of mid to high 20's mileage on trips which was good for a 4000 lb true full sized BOF sedan. The engine never appeared in any other full size BOF car like the Roadmaster or Brougham and never even made it to the Caprice wagon which makes one wonder why they even bothered with this engine for one line of sedan for such a limited run.

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The L99 code W 4.3 liter 265 V8 appears in the majority of 94-96 Caprices that I have seen or know people to have owned in the past. I have driven tons of them as my best friends dealership used to sell them like crazy in the late 90's when gas was still cheap. It made 200 HP and 245 torque, was tied exclusively to the 4L60 4 speed tranny and in 94 used 2.73:1 rear gears.

Ponch, did Chevy make this engine for Chevrolet use and at a time when BOP was converting large cars over to front wheel drive? It seems I recall a 4.3 V8 by Chevy in the early 80s (Monte Carlo RWD, etc) that displaced 267 cubic inches. Is that the one? The only reason I say this is because the Olds 4.3 V8 numbered 260 cubic inches and the Pontiac 4.3 V8 numbered 265 cubic inches.

About the engine you refer to above (L99), is it one that had longevity? Any weird stuff like camshaft lobes prematurely wearing (thinking Chevy 305s of the late 70s/early 80s)?

Edited by trinacriabob

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There's a few other obscure small displacement V8s I was barely aware of--the Chevy 262 of '75-76 and 267 of '79-82, Pontiac's 265 in '80-81, and Olds' 260 of '75-82.

Moltie, see my post immediately above. Though not particularly horsepowerish, I am an ardent fan of the Olds 260 because it shared Rocket V8 hardware yet was very, very quiet. I loved that engine.

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Don't remember that one at all. In fact, I doubt that it actually was produced.

Did you guys forget I mentioned it a few months back?

My buddy (Buick collector and used car dealer) had a

blue-green 100% stock 1996 Caprice Classic with the

"267 LT1" in the engine bay... I considered buying it

when I was selling the ('77 Cadillac) Banana Boat due

to $4.59/gallon prices.

I know I mentioned it... anyway, the motor displaced

4.3 liters, 267 cu.in. to be more precise, and it WAS

indeed produced although ONLY in the Chevy sedan

B-body, & IIRC never in any of the wagons or Buicks

/Cadillacs B-bodys.

Kenny had prob. one of the nicest, cleanest examples

in existence. It had factory keyless & under 100K miles.

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oh.... my bad, I guess it was 265 not 267.

I think I got all the other stuff right.

The wholesale car dealer who had this one is a wicked cool guy.

He's owned many a hi-po Buick, his and his bro. are HARDCORE

Buick guys, between them they've owned many a 1960s/early

1970s A-body GS, a few ragtops/rare option codes, a '70 GSX,

'87 Grand National.... Now that Buicks are lame and lack any

RWD product Kenny is a Chevy guy as far as his non-classics,

back in spring of 2003 he bought a brand new Z06 and he was at

New England Dragway one Wednesday night while I was drag

racing my '68 Camaro.

he had about 300 miles on the car at that point. :spin:

Remember my '94 Buick Roadmaster Estate?

I bought that off of Kenny. He's always got a few B-bodies kicking

around for cheap $$$, he usually drives a Chevy pickup of some

sort for a daily driver in bad weather/winter months.

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Ponch, did Chevy make this engine for Chevrolet use and at a time when BOP was converting large cars over to front wheel drive? It seems I recall a 4.3 V8 by Chevy in the early 80s (Monte Carlo RWD, etc) that displaced 267 cubic inches. Is that the one? The only reason I say this is because the Olds 4.3 V8 numbered 260 cubic inches and the Pontiac 4.3 V8 numbered 265 cubic inches.

About the engine you refer to above (L99), is it one that had longevity? Any weird stuff like camshaft lobes prematurely wearing (thinking Chevy 305s of the late 70s/early 80s)?

Good reading here and nice summaries by Ponchoman, Sixty-eight, and DBeaSSt, and though the question above is directed to Ponchoman I can tell you that the L99 4.3 is known to have the same reliability and longevity of its larger LT1 (P VIN code) 5.7 sibling. The only real complaints usually are directed at the optical-scan distributors and somewhat at the direct-drive water pumps, which are shared by both. These complaints are mostly overblown in my opinion. Sometimes you can get an oil leak from the rear of the intake manifold gasket, which runs down the back of the engine which people mistake for a rear main seal leak.

The three '94-'96 B-bodies I have had have all been LT1 cars though I have friends with L99 Caprices and for all, the engines have proven to be quite reliable, with nothing typically needing to be done to things like head gaskets, valve seals, timing gears, cams, etc. throughout their lives, with little to no oil consumption being the norm. I never needed to add oil to my Roadmaster between standard 3,000 oil-change intervals, even after it crossed the 200,000 mile mark.

As to why they bothered with a smaller engine for Caprice sedans only from '94-'96 while all other B/D bodies were given the LT1s during those years? Not really sure, but I'm guessing having the L99 as base it probably helped give a "value" edge to standard Caprices (including police package cars that were built with the L99) with a slight fuel economy advantage over the LT1. The L99 was competitive with the numbers put up by the Ford 4.6 in the Crown Vic at that time. Also, it is rumored that they intended to offer the L99 in Caprice wagons as well, though that didn't end up happening (keep in mind that in '93 you could buy a Caprice wagon with a 170HP 305, so it wouldn't have been an entirely unreasonable assumption that the L99 could have gone there). Another thing, when these rolled out in the fall of '93 they were likely intended to live longer than to the end of '96, the B/D-body death sentence wasn't handed down until early '95... when they saw how successful the new 4 door Tahoe/Yukon were and, weighed against declining sales of these cruisers, they decided to annex the Arlington assembly plant for additional truck capacity.

FWIW, The 267 Chevy V8 from '79-'82 was advertised as a 4.4 liter, while the 260 Olds and the 265 Pontiac were listed as 4.3 liters in any literature I have ever seen from those years. My '81 Bonneville has the 2-year only Pontiac 265. At 120HP It's slow, but feels surprisingly decent both around town and on the highway, of course, the car only weighs around 3,500 lbs despite its outward appearance looking like it would be more.

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FWIW, The 267 Chevy V8 from '79-'82 was advertised as a 4.4 liter, while the 260 Olds and the 265 Pontiac were listed as 4.3 liters in any literature I have ever seen from those years. My '81 Bonneville has the 2-year only Pontiac 265. At 120HP It's slow, but feels surprisingly decent both around town and on the highway, of course, the car only weighs around 3,500 lbs despite its outward appearance looking like it would be more.

Thanks for the info. That's right, the literature had that smallish V8 as a 4.4 litre.

Yes, Grand Le Mans to Bonneville "Model G" on G-body 4-door platform for a couple of years. With the right seating, those were nice. Shared the GP dashboard as well. So, that engine (4.3 265) ran for 80-81 only.

Back to original topic, so this newer 4.3 is from scratch, more or less, to be in the same family as that newer 5.7... I think that this engine is cast-iron block and head. I was thinking this Caprice/Impala was of the more appealing notchback sedan variety (previous gen), but it turns out it was the "funnier" rounded RWD one which many police fleets used.

Edited by trinacriabob

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<!--quoteo(post=374749:date=Mar 8 2008, 12:37 AM:name=moltar)--><div class='quotetop'>QUOTE(moltar @ Mar 8 2008, 12:37 AM) 374749[/snapback]</div><div class='quotemain'><!--quotec-->There's a few other obscure small displacement V8s I was barely aware of--the Chevy 262 of '75-76 and 267 of '79-82, Pontiac's 265 in '80-81, and Olds' 260 of '75-82.<!--QuoteEnd--></div><!--QuoteEEnd-->

And for some reason I remember all of those, but not this one. <img src="http://www.cheersandgears.com/public/style_emoticons/<#EMO_DIR#>/blink.gif" style="vertical-align:middle" emoid=":blink:" border="0" alt="blink.gif" />

If it were an obscure Caddy or BOP V8 I wouldn't feel so bad about it, but for me to miss a Chevy V8 is bizarre.

There was a ton of them produced! They even used them in the basic 9C1 Police package, unless the "pursuit" 5.7L

engine was specified.

They were the basic V-8 in all the "B" bodies, that had V-8s in the '94-'96 era.

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oh.... my bad, I guess it was 265 not 267.

I think I got all the other stuff right.

The wholesale car dealer who had this one is a wicked cool guy.

He's owned many a hi-po Buick, his and his bro. are HARDCORE

Buick guys, between them they've owned many a 1960s/early

1970s A-body GS, a few ragtops/rare option codes, a '70 GSX,

'87 Grand National.... Now that Buicks are lame and lack any

RWD product Kenny is a Chevy guy as far as his non-classics,

back in spring of 2003 he bought a brand new Z06 and he was at

New England Dragway one Wednesday night while I was drag

racing my '68 Camaro.

he had about 300 miles on the car at that point. <img src="http://www.cheersandgears.com/public/style_emoticons/<#EMO_DIR#>/spin.gif" style="vertical-align:middle" emoid=":spin:" border="0" alt="spin.gif" />

Remember my '94 Buick Roadmaster Estate?

I bought that off of Kenny. He's always got a few B-bodies kicking

around for cheap $$$, he usually drives a Chevy pickup of some

sort for a daily driver in bad weather/winter months.

It was not an LT1 with that displacement. That engine had the code designation of L99!

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There was a ton of them produced! They even used them in the basic 9C1 Police package, unless the "pursuit" 5.7L

engine was specified.

They were the basic V-8 in all the "B" bodies, that had V-8s in the '94-'96 era.

Ah.....

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Every time I see a Caprice from the mid-90s, I wonder if it is outfitted with the 4.3L V8. It might be nice to find one in perfect condition to put around in as a "second car." Wait, I already have a second car.

They are EPA rated at about 26 or 27 mpg, only a couple of mpg less than my Regal. However, there are few sounds sweeter than those of a small-block GM V8, which also occupies Ward's List of Top 10 Engines of all time.

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My buddy owned several 94-96 Caprices as he loves those cars to death. One needed the Opti-spark system replaced and his 96 needed the very common mass flow air sensor by pass done to keep it from being contaminated. My 96 LT1 in fact also needed this done. These cars had a few odd quirks such as front tires that would wear uneven, the MAF problem and Opti-spark issues and the 4L60 tranny didn't always last much more than 100-120k miles without needing a rebuild. The door panals were creeky plastic and the steering column would loosen up after time with clunkiness. Another famous issue with these cars was the stop leak tablets that GM saw fit to put in these cars at the time. This of course caused the heater cores to become blocked up and a no heat condition in Winter driving. The fix was to power flush the heater core and entire cooling system and replacing the t-stat.

Back in the 70's and early 80's GM had a slew of small V8 engines. The first was the 1975 4.3 liter 262 2 BBL V8 that made 110 HP. This engine was installed in some Novas and Monzas as was meant to be an economical V8 choice after the first fuel crisis in 1973. It lasted for two model years only and was later replaced by Chevys 4.4 liter 267 2 BBL V8 in 1979 that made 125 HP. This engine was installed in many Monte Carlos, Malibus and Elcaminos and was again a more economical choice for buyers insisting on a V8 engine. The 267 was also produced in 1980 where it was detuned to 120 HP, in 1981 and 82 where is was further detuned to only 115 HP. From 1980- 1982 it was offered in the mid size cars and also expanded to the Camaro and Caprice Classic. Due to a slowly settling economy, lower gas prices, relaxed mileage CAFE standards and a slight renewed interest in performance the 267 was dropped from the lineup and the 305 4 BBL took over as the top V8 option in all but the new Vette which would debut as a 1984 model with the Cross Fire 350 engine.

Olds also introduced there little 4.3 liter 260 2 BBL V8 in 1975 in answer to the first oil Embargo.It was a smaller bore lighter weight version of the 350 Rocket. This engine made it's way into Omegas and Cutlass Supremes with a HP rating of 110. The 260 lasted until 1982 and was offered on Cutlass and 88 models. Sadly with the adaption of the C4 computer system and strict emissions it was rated at a pathetic 100 HP at a very low 3600 RPM's which translated into ok low end torque and virtually no highway passing power, especially in the heavier 88 B-body! The 307 4 BBL took over in 1983 with 40 more HP.

Not to be outdone Pontiac also got in on the small V8 scene with there own 4.3 liter 265 2 BBL V8 in 1980 which was just a small bore version of the divisions 301 engine. It put out 120 HP and was offered in the Bonnevilles, GP's, LeMans and Firebird cars. It lasted only two model years and was canceled in April of 1981 when GM made the decision to go corporate and dropped both Pontiac and Buick made V8 engines.

The problem with all of these engines was the terrible rear end gears GM installed with them to get the mileage up and the highway revs down. This of course made the engines with there reduced outputs feel sluggish and logy so one sure fire way to improve performance with any of these baby V8's is to upgrade your rear gears to a 3.08-3.23 cog. I knew a few guys with 1977 Omegas with the little 260. They swapped out the 2 BBL intakes to 4 BBL, upgraded to 3.23 rear ends, re- curved there distributers, stuck in a hotter cam and dual exhausts and the difference was nothing short of amazing giving me a new found respect for these peanut V8 engines.

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My buddy owned several 94-96 Caprices as he loves those cars to death. One needed the Opti-spark system replaced and his 96 needed the very common mass flow air sensor by pass done to keep it from being contaminated. My 96 LT1 in fact also needed this done. These cars had a few odd quirks such as front tires that would wear uneven, the MAF problem and Opti-spark issues and the 4L60 tranny didn't always last much more than 100-120k miles without needing a rebuild. The door panals were creeky plastic and the steering column would loosen up after time with clunkiness. Another famous issue with these cars was the stop leak tablets that GM saw fit to put in these cars at the time. This of course caused the heater cores to become blocked up and a no heat condition in Winter driving. The fix was to power flush the heater core and entire cooling system and replacing the t-stat.

Back in the 70's and early 80's GM had a slew of small V8 engines. The first was the 1975 4.3 liter 262 2 BBL V8 that made 110 HP. This engine was installed in some Novas and Monzas as was meant to be an economical V8 choice after the first fuel crisis in 1973. It lasted for two model years only and was later replaced by Chevys 4.4 liter 267 2 BBL V8 in 1979 that made 125 HP. This engine was installed in many Monte Carlos, Malibus and Elcaminos and was again a more economical choice for buyers insisting on a V8 engine. The 267 was also produced in 1980 where it was detuned to 120 HP, in 1981 and 82 where is was further detuned to only 115 HP. From 1980- 1982 it was offered in the mid size cars and also expanded to the Camaro and Caprice Classic. Due to a slowly settling economy, lower gas prices, relaxed mileage CAFE standards and a slight renewed interest in performance the 267 was dropped from the lineup and the 305 4 BBL took over as the top V8 option in all but the new Vette which would debut as a 1984 model with the Cross Fire 350 engine.

Olds also introduced there little 4.3 liter 260 2 BBL V8 in 1975 in answer to the first oil Embargo.It was a smaller bore lighter weight version of the 350 Rocket. This engine made it's way into Omegas and Cutlass Supremes with a HP rating of 110. The 260 lasted until 1982 and was offered on Cutlass and 88 models. Sadly with the adaption of the C4 computer system and strict emissions it was rated at a pathetic 100 HP at a very low 3600 RPM's which translated into ok low end torque and virtually no highway passing power, especially in the heavier 88 B-body! The 307 4 BBL took over in 1983 with 40 more HP.

Not to be outdone Pontiac also got in on the small V8 scene with there own 4.3 liter 265 2 BBL V8 in 1980 which was just a small bore version of the divisions 301 engine. It put out 120 HP and was offered in the Bonnevilles, GP's, LeMans and Firebird cars. It lasted only two model years and was canceled in April of 1981 when GM made the decision to go corporate and dropped both Pontiac and Buick made V8 engines.

The problem with all of these engines was the terrible rear end gears GM installed with them to get the mileage up and the highway revs down. This of course made the engines with there reduced outputs feel sluggish and logy so one sure fire way to improve performance with any of these baby V8's is to upgrade your rear gears to a 3.08-3.23 cog. I knew a few guys with 1977 Omegas with the little 260. They swapped out the 2 BBL intakes to 4 BBL, upgraded to 3.23 rear ends, re- curved there distributers, stuck in a hotter cam and dual exhausts and the difference was nothing short of amazing giving me a new found respect for these peanut V8 engines.

Correct sir on the 260 V8:

http://www.youtube.com/watch?v=RTIYh9A8QF0&feature=player_embedded#!

In reference to the Caprice 4.3 liter V8:

I have the brochure in my house:

It was a 4300 V8 with sequential port fuel injection rated at 200 hp. It was standard on all Caprices in 1994. It was not offered on the wagon in 1995 and 1996.

ENGINES 4.3L V8

Type OHV V8

Bore x Stroke 95.0 x 76.2 mm

(3.74 x 3.00")

Displacement 4343 cc (265 cu.in.)

Compression Ratio 9.4:1

Fuel, Recommended Regular Unleaded

Fuel Induction Sequential F.I.

Horsepower 200 hp @ 5200 rpm

240 lb.-ft. @ 2400 rpm

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ENGINES 4.3L V8

Displacement 4343 cc (265 cu.in.)

power 200 hp @ 5200 rpm

240 lb.-ft. @ 2400 rpm

same power numbers as the 3.8, series 2...yes, not the same rpm. but still modernize it and you get what...maybe 330hp, 290lbft?

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Easy way to tell if your B body has the Lt1 or L99. LT1 had dual exhaust, L99 single exhaust. Also LT1 required premium gas while L99 used regular.

L99 felt like a gutless wonder until it got wound up then it took off.

4.3 V6 was an option in these cars ONLY for fleet usage.

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Easy way to tell if your B body has the Lt1 or L99. LT1 had dual exhaust, L99 single exhaust. Also LT1 required premium gas while L99 used regular.

L99 felt like a gutless wonder until it got wound up then it took off.

4.3 V6 was an option in these cars ONLY for fleet usage.

My '95 LT1 didn't call for special gas... and never had anything but 87. I think that it the Vettes or F-bodys thing that required premium.

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Easy way to tell if your B body has the Lt1 or L99. LT1 had dual exhaust, L99 single exhaust. Also LT1 required premium gas while L99 used regular.

L99 felt like a gutless wonder until it got wound up then it took off.

4.3 V6 was an option in these cars ONLY for fleet usage.

I don't think the B-body LT-1s required premium.

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A small displacement "Small Block" is not really a good idea.

Not that a small displacement V8 is necessarily a bad thing, but the small block's 111.76 mm bore center is really better suited to something around 5.5~7.0 liters, not 4.0~5.0 liters. The 4.3 had a 95 mm bore, that's almost 17mm of metal between each cylinder. This is completely unnecessary for strength. It also makes the engine unnecessarily big and heavy (a lot of useless metal) for a 4.3 V8. If the idea is to create a 4.3 V8, a 102 mm (same as Northstar) or 103mm (same as 3.6 HF V6) will be a better choice. These will yield a smaller and lighter engine. Make a small block displace that few cubic inches, is like deboring and destroking a 3.6 V6 to 2.4 liters. You'll end up with a 2.4 liter engine that is heavier and no smaller than the 3.6 while making less power and torque.

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An old friend of mine had one in his 95 Caprice. It worked well and gave great fuel efficiency. It was smooth and superior to the earlier 5.0L V8 in feel and sound.

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Guest william lasater

i have 1 and i am very happy with the with it. I have a 1994 caprice and i'am the 3 oner.

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