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Speed Secrets: Cam and Nitrous on a Junkyard 4.8! 

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GM’s LS engine has quickly gained a reputation as the ultimate power house and it seems as if everyone is transplanting these engines into everything. While you can buy a well built Crate engine, because of the LS engines potential it can be quite expensive. Lucky for us, GM saw that same potential in the LS engine family and used ... Read More »

Speed Secrets: Camshaft Swapping a Boss 302

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A legendary small block from Ford, the Boss 302 was originally offered only in 1969-1970 Boss 302 Mustangs and the Mercury Cougar Eliminator. In 2007, Ford started offering an engine using the Boss 302 nameplate as a crate engine. Getting your hands on an authentic Boss 302 might be a bit of a task. However, building a replica Boss 302 ... Read More »

Speed Secrets: Getting 500-Horsepower Out of a Small Block Ford

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When thinking of building a high horsepower Small Block Ford, the first modifications that come to mind are Induction system and head flow. While those simple modifications will get you a long ways, there are two key elements that will make hitting your target horsepower rating easier – Displacement and camshaft. One rule in making real power that has never ... Read More »

With a Little Luck: TPI Power Mods

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  Words and Photos by Richard Holdener The phrase, “I’d rather be lucky than good,” comes to mind, but every bit as appropriate is, “Even a blind squirrel finds a nut”. What do we mean by these and what do they have to do with improving the performance of your average Tune-Port Chevy motor? This story began with a simple search ... Read More »

Speed Secrets: 408 Fast Intake Test

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Single plane carbureted intakes are notorious for making big peak power, and the Fast LSXR intake is the best of the best when it comes to LS EFI applications, but how do the two compare? To find out, on an episode of Speed Secrets Richard Holdener and the guys from Fast stage an intake shoot out. For a test engine, ... Read More »

Speed Secrets: Is a Camshaft Swap Necessary for a Boosted Engine?

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The Xtreme Marine XM284HR camshaft with a .547 lift, 230/236 duration, and 112 LSA is an excellent camshaft for a ZZ-454 in a marine application, but how well would the cam do with boost? Richard Holdener with Speed Secrets teamed up with Comp Cams to put the combination to the test. This test was out of the norm in that ... Read More »

Speed Secrets: Zex Nitrous and Small Block Chevy Engines

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Whether from a turbo, blower, or nitrous, there is a lot to love about power adders. Especially when used in a Small Block designed specifically for them, like the SBC 383 Stroker from Blue Print Engines. It has everything you’d want for power adder applications, Including forged internals, low compression, and aluminum free flowing heads. Making the 383 that much ... Read More »

Speed Secrets: It’s Time to Juice the LS

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Typically, nitrous comes in two different configurations. For EFI applications there is the wet fogger system, where you combine nitrous and fuel in a single fogger nozzle and install it somewhere in the air intake system. Although, if you were looking for nitrous for a carbureted application, a perimeter plate type system would be the way to go. While both ... Read More »

Speed Secrets: Combining a Big Block Chevy with Nitrous Means Big Power

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As far as naturally aspirated power, it’s hard to beat a Stroker Big Block Chevy, especially one with a nice hearty camshaft from Comp Cams. The fun doesn’t have to stop there though. With a little throttle in a bottle, a healthy BBC can get real serious, real fast. To explore just how far a little nitrous can go when ... Read More »

Speed Secrets: Putting the Wrong Camshaft in an LS Engine

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GM made two different port style heads for the LS engine family, the cathedral port and the rec-port, and while everyone knows that LS engines respond very well to cam swaps, what happens when the “wrong camshaft” is used in an LS engine? To find out what would happen if you took a cathedral port cam and installed it in ... Read More »