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First measure your stock cam's base circe diameter. This is the widest point on the intake and exhaust lobes. Punch this into the stock cam base circle diameter.
Repeat this for your new cam's intake and exhaust lobes in the labelled cells.
Finally, if you milled your heads put in how much they were milled, i.e. 0.010 milled.
This will spit out the length of the pushrods required for your new cam and/or heads set-up. Thanks to Allcammedup for getting me straight on the math :cheers: