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Old vehicle Memories > Muscle dare > 1983-1988 Chevrolet L69 5.0 Liter (305 CID) H.O. V8 – a genuine 1980s Legend

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When Chevrolet released the 305 CID V8 for the 1976 design year, no one consisting of Chevrolet would have imagined the would end up being one the the hottest performance V8s of the 1980s. The 305 V8 which to be a member the Chevrolet’s small-block V8 household had only three main purposes back in 1976 – to administer smooth acceleration, good reliability, and an excellent fuel efficiency. Top top these three accounts it to be a success. It to be rated 140 or 145 horsepower depending on which 1976 auto model it to be ordered with and its only induction mechanism was a Rochester 2-bbl carburetor. It was the follower to Chevrolet’s small-block 307 CID V8 which to be a spending plan V8 that only was equipped with a 2-bbl carburetor and never produced much more than 200 gun horsepower and also had an output as low as 115 net horsepower. The gas-sipping 307 had actually a brief life span from 1968 to 1973. The 305 soon after its development was obtainable in countless different GM makes and also models.

There was a reason why many auto enthusiasm would have never envisioned the 305 ever before being a power motor earlier when that was an initial released. The 305 had actually a very small bore of 3.736 inches which was also smaller than the 3.875 customs bore the the 307 V8 (the 307 offered the same bore together the small-block 283). The 305’s bore was even smaller than the 3.75 customs bore the the 1955-1957 265 CID V8 which was the an initial small-block Chevrolet V8. The small-block Chevrolet 302, 327, and 350 CID V8s all share the same huge bore of 4.000 inches. The benefit of a large bore is it renders much far better use the high power cylinder heads. Generally a larger bore V8 engine with a great set that cylinder heads will certainly rev greater on the rpm variety than a similar displacement V8 with a smaller sized bore and longer stroke. ~ above the surface the 305 (5.0 liter) V8 would seem to it is in an same to its large competitor throughout the 1980s, the Ford 302 (5.0 liter V8). But Ford’s 302 had actually a big bore and really short stroke – 4.004 inch bore and 3.00 inch stroke – giving it a much better potential once aftermarket high performance components were added versus the 3.736 customs bore and 3.48 customs stroke 305.

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It to be not until the 1982 model year when GM’s new corporate engine plan took effect, that the 305 then described as the 5.0 liter V8, became GM’s most popular V8. The 145 horsepower and 240 lb-ft of torque LG4 4-bbl 5.0 liter V8 was supplied in countless of GM’s 1982 cars. Even the 1982 Chevrolet Camaro Z28 and also 1982 Pontiac Trans am (GM’s performance F-bodies) used the LG4 together their typical engine. And it to be 1982 that significant the very first year the 305 became a performance engine. Together an optional engine top top the Z28 and also Trans Am, Chevrolet exit a thicker wall version that the 305 block that had actually other performance upgrades – the an outcome was the power oriented LU5 5.0 liter Cross-Fire Injection V8 (a dual throttle human body fuel injection system) which to be rated at 165 horsepower and 240 lb-ft of torque. 165

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horsepower appears paltry by today’s standards when even plenty of 4-cylinder motors today exceed this speech figure, yet thirty years earlier 165 horsepower was more than most V8s created during this time period. This to be an era when most V8 developed less 보다 150 horsepower and also anything that produced an ext was a power motor. As an instance the 1982 Ford Mustang GT v its (2-bbl) 5.0 liter (302 CID) H.O. V8 produced 157 horsepower and also 240 lb-ft that torque.

The LU5 5.0 liter Cross-Fire Injection V8, provided the Corvette’s L83 5.7 (350 CID) Cross-Fire Injection V8’s high-performance video camer which provided the LU5 a very high compression ratio (by 1982 standards) the 9.5:1. In 1983 the advertised speech rating the the LU5 boosted to 175 horsepower and torque boosted 250 lb-ft. One of the difficulties with the LU5 to be the aluminum intake manifold which handled the flow from double throttle human body injection (TBI) units had actually a maximum flow of just 475 cfm in order to accomplish emissions regulations (the Corvette L83 offered the very same intake manifold). Chevrolet engine engineers might have available a higher flow input manifold to rise the LU5’s horsepower yet it instead to made decision to change the LU5 with an additional high power 305 – the L69 5.0 liter H.O. V8 – the H.O. Stood because that High Output. The L69 provided the strengthened LU5 305 engine block, LU5/L83 high power cam, and LU5 cylinder heads. The distinction was Chevrolet with the L69 replaced the LU5’s induction system with a power tweaked computer controlled Rochester Quadrajet (750 cfm) 4-bbl and an aluminum intake manifold. The L69 had the LU5’s 9.5:1 compression proportion which was much higher than the LG4 4-bbl 305’s 8.6:1 compression ratio. Yet the L69 had actually a brand-new knock sensor which to be something the LU5 regrettably didn’t have. V a 9.5:1 compression ratio both the LU5 and also L69 compelled at least 91 octane fuel – the L69’s hit sensor would immediately retard ignition timing preventing engine pinging and knocking if anything less than 91 octane was used.

throughout the center of the 1983 design year, Chevrolet debuted the L69 in a brand-new performance offering the Monte Carlo SS (the resurrection the the at an early stage 1970s Monte Carlo SS). As soon as it debuted in the Monte Carlo SS, Chevrolet initially advertised the L69 as developing 175 horsepower and 240 lb-ft the torque. This rating was underrated much more than likely for the purpose of no stealing sales indigenous the (175 horsepower) 1983 LU5 Camaro Z28. Motor tendency magazine (April 1983) as soon as it check drove a 1983 Monte Carlo SS referred to it as having actually 175 speech in the human body of the article, but noted the SS’s L69 under the article’s "specifications" ar as having actually 190 speech which was a much more accurate figure. Nevertheless the L69 it is provided Monte Carlo SS was much faster than the LU5 it is provided Camaro Z28 and Trans Am. Engine Trend when it test drove the 1983 SS obtained a 0-60 mph time of 7.97 seconds and quarter mile (1/4) mile that 16.08 seconds at 85.1 mph and also it commented the "it’s quicker and faster than either the the corporation’s F-cars, at least until they gain L69 V-8 engines of their own". Indeed that to be the case, the 1983 Camaro Z28 and also 1983 Trans am a couple of months later both got the L69 choice rated in ~ 190 horsepower and 240 lb-ft the torque. A Borg Wagner T5 5-speed hands-on was mandatory along with a power oriented 3.73 behind axle ratio on the L69 powered 1983 Z28 and also Trans Am. Car and Driver (June 1983) check drove a 1983 Camaro Z28 L69 and obtained a 0-60 mph time the 6.7 seconds and a 1/4 mile of 15.0 seconds at 93 mph. Motor tendency (June 1983) also test drove a 1983 Camaro

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Z28 equipped v the L69 and the result was a 0-60 mph time that 7.41 seconds and a 1/4 mile that 15.55 secs at 90.5 mph. This times were a little slower 보다 Car and also Driver’s, yet it to be still significantly faster 보다 the 175 speech LU5 1983 infectious diseases world fashion Am additionally tested through Motor trend (June 1983) i m sorry only regulated 0-60 mph in 8.5 seconds and the 1/4 mile in 16.44 seconds at 83.6 mph. This showed the L69 was a large performance run from the LU5.

through 1984, the L69 went back again together the Monte Carlo SS’s just engine, but it was currently rated in ~ 180 horsepower and also 240 lb-ft of speak which to be still 10 horsepower less than that is true rating. The Monte Carlo SS for 1984 ongoing to use the outdated 3-speed automatically – a new mandatory 4-speed automatically transmission through overdrive would officially replace the 3-speed automatically for 1985 (there are rumors a handful of so late in the version year 1984 SSs left the factory with 4-speed automatically transmissions). The Monte Carlo SS would continue through the 1988 design year with just the really slight updates, it would continue during this time to usage the L69 together its only motor. Unfortunately an automatic infection would continue to be the only transmission easily accessible on the SS. Chevrolet could have an extremely easily available the Z28’s 5-speed manual transmission in the SS, but chose no to carry out so – it most likely didn’t want the SS come take far Z28 sales. Though the 1984 SS and also 1984 Z28 used various exhaust equipment both were comparable in design – both to be a free-flow twin outlet exhaust device which provided a solitary catalytic converter and twin resonators. So there should have actually been no reason, as well as Chevrolet having an ulterior motive, the the SS’s L69 was rated 10 horsepower less. The 1984 SS would retain the 1983 SS’s 3.42 behind axle proportion (the L69 fitted Z28 and Trans to be both had actually a 3.73 behind axle ratio). Unfortunately the SS would certainly not acquire 3.73 rear gears till the 1985 model year. Famous Hot Rodding magazine (July 1984) obtained a 0-60 mile time of 7.9 seconds and also a 1/4 mile time the 15.41 in ~ 91.98 mph v a 1984 SS.

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The L69 would certainly not critical as long in the Z28 and also Trans Am, it would just remain till the finish of the 1986 design year. Chevrolet presented a brand-new top performance Camaro in 1985 called the Iroc-Z, that was easily accessible with the L69 in 1985 and 1986. 1984 to be the just year that the L69 was easily accessible with both the 4-speed automatic and also a 5-speed hand-operated transmission in the Camaro Z28 and also Trans Am. For 1985, a new 215 horsepower 5.0 liter Tuned harbor Injection (TPI) V8 was added to the Z28 and also Trans Am alternative list. Since the 5.0 TPI V8 was only available with a 4-speed automatically for 1985-1986, the L69 for 1985-1986 served as the high-performance manual transmission motor because that the Z28, Iroc-Z, and also Trans to be (the L69 might not be ordered v the automatic transmission in the Z28, Iroc-Z, and also Trans Am because that 1985-1986). Because that 1986 the TPI 5.0 was detuned to 190 horsepower which was the exact same horsepower rating that the 1986 L69.

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The L69 was various than the muscle automobile engines that the golden muscle vehicle era, in that it was developed not specifically for power but additionally to accomplish the EPA’s Corporate median Fuel economic situation (CAFE) and also emissions standards. The L69 was no only one of the hottest power engines that the 1980s, as soon as equipped v a 4-speed automatically or a 5-speed manual transmission it had actually an EPA highway figure of 26/27 mpg. The course earlier then this form of mpg was generally obtainable only

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when setravel on the highway in ~ a secure 55 come 60 mph. Owning a L69 equipped GM performance auto meant you can have a muscle automobile that didn’t stop at every gas terminal it passed.

also though every the L69s produced were similar in terms of specs (except because that the SS’s reduced advertised horsepower), there to be one area whereby the L69s discovered in the Camaro Z28/Iroc-Z, infectious diseases world fashion Am, and Monte Carlo SS differed. This area to be the air cleaner assembly. The Monte Carlo SS offered a huge pedestrian round black air cleaner assembly with a solitary snorkel (snorkel was on the passenger side). The 1983-1984 L69 trans Am provided a smaller round black color air cleaner assembly through a single snorkel (snorkel to be on driver side) – the 1983-1984 L69 infectious diseases world fashion Am’s wait cleaner assembly had actually a huge hole on the optimal lid come suck wait from the sensible hood scoop (it had a solenoid controlled flap in the hood scoop which opened up to permit air to happen to the waiting cleaner assembly as complete throttle was approached). However it to be the L69 fitted Camaro Z28 and Iroc-Z which had the many impressive looking waiting cleaner assembly setup – it to be a little round black color unit v two free-flow snorkels that got air from two large air ducts below the hood and over the radiator. The best component was the red "5.0 Liter H.O." decal ~ above the height of the ring air cleaner lid. The 1985-1986 L69 equipped Trans Am used the Z28’s double snorkel wait filter assembly since the sensible hood scoop had actually been discontinued.

The L69 was a bright point out in GM’s performance history. Whereby its predecessor the LU5 just kept performance alive, the L69 placed GM’s performance cars ago in 15 2nd range 1/4 mile territory. Unfortunately the L69 with its electronically regulated 4-bbl carburetor was no in GM’s future plans. The times were

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changing and also port type fuel injection was the method of future as result of its an ext precise fuel metering capabilities allowing it to more easily fulfill future CAFE and emissions regulations. As soon as the 1988 Monte Carlo SS ended production, the L69 got in permanent retirement but its performance legacy still proceeds to this day. And also for those that are worn down of the present high prices of the 1960s and also 1970s muscle cars, a L69 powered 1980s GM muscle auto is the clever choice. There room still a an excellent number of pretty conditioned L69 it is provided cars around, most of these room currently an extremely reasonably priced at well under $10,000. And also there is a an excellent future potential for these L69 it is provided cars raising in price in the not too remote future. Once it concerns owning a quick 1980s muscle car, a L69 powered muscle car is among the finest choices the you can make. Renowned 1980s nostalgia prefer parachute pants, cassette tapes, Pac-Man, eight boxes, and Sony Walkmans might all be lengthy gone and forgotten but the L69’s legend still lives. It to be the 1980s computer controlled variation of the old muscle auto V8 – a high-output 4-bbl V8 that was a actual 1980s legend.

Written contents in this post – © 2012 Pete Dunton – all Rights booked