.......and discuss! https://www.ebay.com/itm/1970-Buick-Other/174467513305?hash=item289f12fbd9:g:79sAAOSwX1pffKRp
A stock 5.3 make about the same horsepower and less torque a lot higher on the tach than the Buick 350 it was built with. I don’t see the point. Patrick
LS with an LS... But is the 5.3 L Vortec really an LS engine? Link: http://bdturnkeyengines.com I ONLY SELL VORTEC TRUCK ENGINES I DO NOT SELL LS ENGINES CLARIFICATION: Everyone consistently calls a Vortec an LS and that is not accurate! Although Vortec engines are "LS" based they are NOT LS engines IMO. Besides most Vortec's being iron block, as seen above there are some serious size differences and considerations depending on your project. VORTEC ENGINE IN CARS: For the most part, it will be challenging to put a Vortec truck engine into a car. Most cars, even old muscle cars have relatively low hood clearances. If running even a minor cowl hood a Vortec may fit. You can gain an inch or two by removing the plastic engine cover and cutting some of the plastic tabs on top of the Vortec intake manifold. This may be all you need for clearance and a Vortec will fit in your car. CONVERSION: It is NOT economical IMO to "convert" a Vortec to an LS nor an option I offer. Below is what would be needed just to lower the intake height and match the LS. If you ALSO require the shorter LS accessories that will add another $500 or so. LS6 Intake Manifold - $400 minimum used LS Injectors - $150 used LS Fuel Rail - $100 used Alternator Relocation kit - $250 Camaro Water Pump - $150 Custom Tuning - $500+ WIRING HARNESS: The other thing to consider is the differences in the Vortec wiring harness layout versus the LS layout. The Vortec truck harness has a large portion up on top of the intake manifold, is supported by it, and is covered or hidden by the plastic engine cover. The LS engine harness is configured much differently and the intake manifold is exposed and uses valve covers to dress up the engine. My engines / harnesses are ALL Vortec Truck, therefore when you put a car intake on a Vortec you are left with an excessive amount of wiring on top of the intake manifold. It will work, but it is very "ugly" to say the least.
Don't compare Gross HP figures with an engine that was built after 1971 (SAE HP), like the stock 5.3: 1970 350 with 9.0:1 compression ratio = 260 Gross HP 1971 350 with 8.5:1 compression ratio = 230 Gross HP 1972 350 with 8.5:1 compression ratio = 155 SAE HP So let's say the 1970 engine, with the slighty higher compression ratio, produced only about 170 SAE HP.
Vortec to me is the traditional small block with the better heads from ‘97 or so. I know GM called the ‘new’ engine a vortec, but it’s an ls through and through, regardless of what you call it or how tall the accessories are or iron vs. aluminum. If ls parts, brackets, gaskets, heads etc. fit, it’s an ls. The owner went to a lot of trouble to put a stock truck engine in there, when the factory 350 made similar horsepower and more torque at a lower rpm. (Four barrel 350 was listed as 10:1 and is closer to 300 hp, which nets out to mid 200s, not 170.) For what he achieved, he’d been a lot better off with a hot Buick 350 build or a 455 swap. But that’s my opinion, even if you disagree, it and a couple bucks’ll buy you a coffee. Patrick
Thats really what stock buick 350's made? Sounds like some people desperately blowing smoke to try and compare it to Vortec/Ls engine lol. Let's not forget that 98-02 Trans as/ Camaros were dynoing anywhere between 270-330 stock w/ 5.7L LS1. The same engine shared with the 5th gen Corvette. Of course detuned because Corvette owners didn't want to be outran by a lower pedigree. Let's compare that 5.7L LS1 350 with the 1970 Buick 5.7 350. And if you really want to dig into it. Do a search on the LS6. The factory race engine that was in the flagship Z06 for a few years.
Thats a blueprinted 350 engine too. The average production engine would likely not make that much power.
...But the seller didn’t put a Trans Am or Corvette ls in there. He put a 300ish hp 5.3 truck engine in there. (And hp is much less important than torque. Until the ls swap is passing the 500 lb/ft mark, Buick 455 swap wins). My point was that he went to a lot of trouble, removed not just the Buick 350 but all ‘Buickness’ from the poor old car, to gain driveablilty equal to a well sorted carbureted iron Buick engine. Patrick
Edit just realized what your actually comparing lol can't believe it flew over my head. https://www.ebay.com/itm/2004-BUICK...PULL-OUT-LS1-LS2-LS6-164K-MILES-/183357299595 So if I was to swap in this Buick engine into my Lesabre. Theoretically its still a Buick. I mean it was pulled from a Buick production car and the engine was installed from factory. Theoretically it would retain all "Buickness". I would even have the supporting documents to prove it was pulled from a Buick.
I like an ls; it’s a fine engine that is very reliable and can make a lot of power, so I understand the logic of using them. Had this owner added a turbo, blower or other power adder, or used a bigger stouter ls the swap would have made sense. (Swapping in non Buick engines, including the ‘corporate’ designs, isn’t my cup of tea but often the swap is logical.) This swap though doesn’t make sense-he had to change and adapt a lot but got very little to show for it. Patrick
This 350 would be sweet in there, require almost no changes, and mop the floor with that truck ls. Probably net out cheaper, too, all parts snd labor considered. http://www.v8buick.com/index.php?threads/tsp-level-1-350-buildup-info-and-dyno-results.153248 Patrick
I googled the 5.3 lm7 Chevy high performance had a stock LM7 on the dyno with short tube headers. It made 342 horsepower box stock. I don't recall the torque numbers. The difference between the TSP 350 and the 5.3? The 5.3 donor truck was probably the bought for a grand and came with the entire donor drivetrain and didn't require much. The TSP 350 probably starts at 5k and is a few months away. It is what is.. Edit- the 5.3 made 373 lbs-ft. The buick makes 396.. https://www.hotrod.com/articles/dyno-tested-add-60hp-junkyard-53l-ls-just-100/