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Having met with nothing but frustration so far, Peter is ecstatic when a phone call comes inviting him down to the owner's place. The caller claims he is too busy to come look at the car but asks if Pete can haul it down to a drag strip where he is running his nitro methane funny car on the upcoming race weekend.He and Gary uncover a true survivor car that has been living in this garage for 30 years. Not an average car, not an average customer, not an average weekend. Peter has client come in looking to get rid of a good Jag, and mid restoration money pit in exchange for one of the new, muscular, 600 plus hp Shelby GT 500s.Any given camshaft will be perfect only at one engine speed.At every other engine speed, the engine won't perform to its full potential.In this article, you will learn how the camshaft affects engine performance.We've got some great animations that show you how different engine layouts, like single overhead cam (SOHC) and double overhead cam (DOHC), really work. As the camshaft spins, the lobes open and close the intake and exhaust valves in time with the motion of the piston.

On the next page of this article you can see the animation we built to really show you the difference between a performance camshaft and a standard one.

Notice that the exhaust (red circle) and intake (blue circle) cycles overlap a lot more on the performance cam.

Because of this, cars with this type of cam tend to run very roughly at idle.

Meanwhile, the LMC crew is giving the new Shelby some sweet upgrades.

LMC has a client that wants to build a replica of the iconic 68 Mustang GT as seen in the movie Bullitt.

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