Re: Re: [Chrysler300] rebuilding '64 413 motor

[<smopar@xxxx>]

> I also used a "purple shaft" cam in one of my 440s - it had relatively poor off the line performance and didn't go that much better in the upper speed ranges either. I agree with the former post by Mike in going with the 375 HP cam he mentions. I don't know why the "purple shaft" cam seems to be revered in Mopar circles. It was so bad, I yanked it after only a short run with it. 
Steve Albu

> From: Mike Apfelbeck <moparmike@xxxx>
> Date: 2003/12/05 Fri PM 07:36:20 EST
> To: gdmoore@xxxx, Chrysler300@xxxxxxxxxxxxxxx
> Subject: Re: [Chrysler300] rebuilding '64 413 motor
> 
> 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.
> >
> 
> 
> 
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