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We agree on one thing; BEST small block ever built. Way under rated? I say no, and the ET's and Mph from those cars stock jive perfectly with the factory rating. If we want to talk OVER rated, how does GM explain why the 340's ran with or beat their much higher "rated" small blocks?

I thought they were 350-375? The origional posters didn't hit 375 with a cam, carb, and open headers. The stock one in the MM article, NON- blueprinted, made 281 with open exhaust off the manifolds. None of these were blueprinted from the factory, and were far from optimum. A carefully...

Did you look at any of the dyno tests in here?

This could be a good thread if people look for the information it contains. One thing I really dislike is imaginary horsepower. Guessing or hoping doesn't prove much. It's only been recently I've been really checking deck clearances, CC'ing heads etc. Not much I have measured lately matches...

Small chnages can mean alot. Mopar Muscle did a series of builds, a 340, a 383, and a 440. They used stock replacement parts, stock cams and rocker gear, stock exhaust, and NO blueprinting, as regular production engines surely weren't. In all 3 cases, factory rated HP was very close. Small...