budget 273 build

JJR said
Hello, my name is Jedidiah Rumbolz. I have a 1966 dodge dart gt with a 273 that is in need of a rebuild. I was wondering if any of you know a couple tricks to get a couple easy horses out of this engine. I am aware of a package called the D- Dart that dodge did in 1966 for racing in D/Stock. I believe it had a 273 with a .500 lift cam, 4speed, and a 8 3/4 with 4.88 gears. Will the heads on my engine flow at that lift? I only planned on taking this engine to 6000rpm. How much spring pressure can a stock valve train take?

What transmission do you have? What do you intend to do with your Dart? Valve spring pressure should be matched to the cam you choose. 6,000 rpm is easy for a 273. If this is a street motor I would stay under .500 in lift to use single valve springs and the good Viton positive valve seals like Mopar Performance sells. The "64" to "67" 273 valve train is very stable since it is solid lifter with adjustable rocker arms from the factory.