In the '57 Ford Car and Thunderbird Shop Manual, in Chapter 3, Section 7, beginning on page 1-72 and continuing through page 1-74 is the step-by-step procedure for 'Camshaft Replacement (Engine In Chassis)' for all 8 cylinder engines.
To illustrate how helpful this direction manual is, what follows is the in-depth procedure for 'Tappet Replacement' as found in the second column on page 1-73:
"Remove and install one tappet at a time through the bottom of the block. A flexible-type holding tool can be used for this operation. As each tappet is installed, secure it in the up position."
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NOTE: In the directions prior to this step, the manual explained how to raise the tappets clear of the camshaft lobes and secure them with modified spring type wooden clothes pins or modified window regulator spring clips prior to 'carefully removing the camshaft by pulling it toward the front of the engine' while 'exercising the necessary caution to avoid damaging the camshaft bearings'.
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Richard, you've been a member of the Forum for some four years. As a fellow y-block enthusiast, your participation with us is valued. Changing a y-block camshaft and lifters with the engine in the vehicle chassis could be a life altering event. Don't do this to yourself! It could destroy your enjoyment of a hobby you have put time and effort into.
Regards,
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York