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Original Message
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| RE: Solid cam questions |
| By John - 02/10/2004 3:16:15 PM; IP 198.81.26.102 |
| Ian ,McQ and Royce covered the reason for the two different length pushrods,but Royce said there wasn't much difference between them and that is true if you are running a mild engine for the street but if you are building a high revving engine the shell type lifter with a hollow tube pushrod like the crane item is significantly lighter than the dumbell lifter and pushrod that is why Ford used them as part of the "7,000 RPM kit".The lighter lifter and pushrod will allow higher revs before valve float without resorting to super high pressure cam killing valvesprings.Ford used these along with hollow stem valves to extend the RPM range of the 427 engine from 6200 to 7000 for the duration of a 500 mile race,while still using the same valvesprings as before.Everyone knows that 427s will rev past 6200 with their stock valvetrain but they won't maintain it for 4 hours.If there is not too much difference in price it stands to reason that the lighter stuff will be easier on your cam and valve train over the long haul. |
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This thread, so far...
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