Re: Packard V8 possibilities

Posted by Jack Vines On 2019/8/12 11:05:07

FWIW, the Packard V8 top end also needs all new parts:
1. The long, heavy 3/8" stem valves aren't suitable for higher RPM. They have to be replaced with custom 11/32" or 8mm stem valves.
2. The valve springs are not strong enough. They have to be replaced with custom springs.
3. The valve spring retainers on earlier engines were too soft and would let the keeper pull through, dropping the valve into the piston. Again, custom retainers.
4. The Packard cam profile is great for a smooth idle and low speed torque. For maximum power, a custom camshaft more lift and duration is necessary.

Then, there's the oiling system. I've learned to modify the OEM pump to work satisfactorily, by it's actually less expensive to convert to the Oldsmobile oil pump and pickup.

jack vines