Re: [Chrysler300] Difference between 413/340 and 413/360?

[Mike Apfelbeck <moparmike@xxxx>]

All 413s shared the same stroke(along with the 440s, 426s and the late 
hemis) of 3.75in..A 3.38 in. stroke was shared by the 361, 383 and400 inch 
engines. Compression ratios are determined by a combination of piston crown 
height& combustion chamber volume in the head. They didn't change rod 
lengths to vary compression, it was a lot more cost effective to alter the 
shape of the piston crown to do it. Exhaust backpressure is more a function 
of airflow thru the engine versus flow capacity of the exhaust system than 
anything else.

Mike

At 01:06 PM 7/27/02 -0400, crash5194@xxxx wrote:

> Doug,
>
> Some help to your questions may be the following:
>
> The 340hp had a stroke of 3.375 (9.5-1 comp) and the 360 hp had a
> stroke of 3.750 (10-1 comp).
> Also, the 340hp had 1.60 in head dia valves and the 360hp had 1.75 in
> dia.
> You could installed the longer connecting rods, but there would be
> more backpressure in you exhaust. You would probably need to replace the
> heads, which will fit, from a 360hp engine.
>
> Crash
> 1964 300-K (360hp) convert
>
>
> [Non-text portions of this message have been removed]
>
>
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