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With the right cam and heads your 493 will make 600 hp, actually it shouldn't be hard. To get there you need around 300 cfm at 28" depression, the standard. You are at 260-270 now. an extra 30 cfm can mean more than 60 hp.

Think about it...if you built a stroker you must have wanted more power. Porting the heads is a proven way to get there, you would notice the difference with the cam you have now.

Going "the next step up" in an Edelbrock head puts you into the realm of offset rockers, more on the race side. I'd say don't do it unless you are a strictly quarter mile guy.

Jeff at Modern Cylinder heads seems to have the program for CNC porting these heads. As said above, a CNC program starts with an optimized port. It is then measured and the dimensions changed into directions for a computer numeric controlled milling machine. The machine does every port the same and it doesn't require a skilled individual to do it by hand. The net result is the best port for every cylinder. The hard part is getting the right port and making a program.

R. [/quoI agree 100% with Dog. Why bother stroking it then? Its a 493, let it breath.

Another example, such as Johns above, but totally different car, 3600# leaf spring foot brake bracket car, has gone 10.06 @132+, and goes and goes and goes. Not even really optimized, because its in bracket mode. Uses a shelf .650 Comp cam. Heads were 296@.550, 304 @ .600

The Eddy heads work very well. These heads were hand ported.Stuff it in the 2500# Duster below, and probably similar results, although I'd think the Duster has more lobe seperation and more lift, just guessing.