Re: [Chrysler300] rebuilding '64 413 motor

[Mike Apfelbeck <moparmike@xxxx>]

The right pair of '71 or later heads will already have the big valves & 
hardened seats. They will also have bigger combustion chambers, which will 
lower the compression ratio, but you can allow for that when you order the 
pistons. A compression ratio of 9 to 1 is , realistically, about all one 
should have with today's fuel quality anyway. I used a "purple shaft" cam 
in a street-driven 440 for a while, it didn't seem to make the car go 
noticeably better. A better choice would be the 375 horse 440 cam 
(the"roadrunner" cam), it has better idle quality and will produce all 
around better torque, horsepower and mileage.
Of course when you find out what it costs for a set of custom pistons for a 
413, you may just decide to pick up a high perf 440 (which already has the 
good heads and cam) to freshen up and save your matching numbers original 
motor for the next person to own your car.

Mike

At 12:11 PM 12/5/2003 -0800, greg moore wrote:
> I have just started the process of rebuilding my 300K convertable. We
> pulled the413 non-crossram motor for rebuild. The car will be a summer
> driver and will bore & hone for new pistons .020 - .060 ? the block goes
> out next week. I have been told to switch to the 516 or newer heads? I
> plan to put in hardened seats and some minor porting and have blue print
> and balance the motor by a local high quality shop. He feels that the
> 1.60 valve is to small but is the biggest that should be installed with
> current heads? He thinks a mild purple cam is fine for my application.
> I know this is a can of worms to open but I would appreciate knowing
> what others have done, what worked well and what to avoid.