Dave@DDMWorks what do you think about this 4 cylinder 3.6 liter 360 HP (NOT BOOSTED) engine from Blue Print Engines. What do you think about a 2016 Slingshot install when it is available? I just might be interested, according to pricing.

Blue Print Engines Maybe! GM 4 cylinder
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That is the one! They are not listed on the web site yet.
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That 360hp is boosted, not naturally aspirated. I have only found one place that ever quoted a naturally aspirated horsepower number and it was 160HP. All of the press releases I have seen on that engine that quoted 360hp and 500 ft/lbs of torque was boosted.
"The engine is very much a concept at this stage with no running examples, but Blueprint say the LS-headed four pot should be good for 340hp and around 500 ft/lbs with the help of a turbo."
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Yep, but there was a lot of interest at the trade show. Blue Print did not say either way whether it had been run or not.
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As for the engine swap, it really is going to come down to what the engine makes for power naturally aspirated and price. If you go the route of swapping this into the Slingshot, custom engine mounts, radiator hoses, electrical connections/sensors, bellhousing adapter, exhaust, etc will have to be made for the swap to work. Lets say it does make 215HP naturally aspirated (base LS3 crate engine makes 430 so half of that), is the extra 40 horsepower over the stock 2.4L Ecotec worth all the trouble? I can not answer that for you, also without actually having real numbers from them yet it would be anyone's guess right now.
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I know about all of that Dave@DDMWorks, the last car that we built I had half the labor in. I did all of the wiring and the fiberglass work. Then half of all the rest. It was a 1941 Willy's coupe with a 502 big black and an 871 blower, pro street I was in on 5 more hot rod builds over the years. I still have my 1935 Ford, all it needs is the new radiator installed but my back will not let me do those things anymore.
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But?!...what about the internals...I don't know how it lasts like our 2.4 ltr does?