Re: Harmonic balancer info
Posted by Ross On 2014/4/10 5:51:20
It is a 51 288 bored iirc .040 over, ported and lightly relieved. I use 1954 heads whenever I can as Packard finessed those heads every year and 54 was the latest and best. The combustion chamber contours represent a lot of research on turbulence and flame propagation that I don't imagine I am going to improve. I merely polish out the sand-cast roughness to minimize heat transfer. I am not a big fan of heavy head milling to raise compression: as you do so you loose flow path over the top of the intake valve which is counterproductive. Plus the engines become harsh and fussy about their fuel. This car spends most of its time on back roads.
The crank was very nice, as they usually are, so I left it alone. The replacement pistons were all within a couple grams of each other so I left them alone. I did smooth off the rods of their forging marks and then brought them within a few grams of each other.
The cam is stock and very tractable--it will pull up a steep hill at 20 with the torque convertor locked. On other cars I have had Crane grind me a warmer cam (I know just about nothing about cam grinds) which were still quite tractable but gave a noticeable performance boost. Knowing what I know now, I probably would have installed a 54 cam gear if I could find one to bump the cam timing--that or make a stepped key to advance the cam to 54 specs.
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The crank was very nice, as they usually are, so I left it alone. The replacement pistons were all within a couple grams of each other so I left them alone. I did smooth off the rods of their forging marks and then brought them within a few grams of each other.
The cam is stock and very tractable--it will pull up a steep hill at 20 with the torque convertor locked. On other cars I have had Crane grind me a warmer cam (I know just about nothing about cam grinds) which were still quite tractable but gave a noticeable performance boost. Knowing what I know now, I probably would have installed a 54 cam gear if I could find one to bump the cam timing--that or make a stepped key to advance the cam to 54 specs.
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