[Chrysler300] AMAs, 355HP, Manual C300, et.al.

[lettercars@xxxxxxx]

Rich, Dan, and All:
I will try not to belabor this topic. (Scared to!!)
 
1.  My copy of the 1955 AMA Specs is also the 2-15-55.  I made a  copy of it 
while at Chrysler in the '70s 
     and would have certainly tryed to get the latest  issue.  Doesn't mean I 
did, though.
 
2.  The 355 300B utilized a higher compression HEAD.   The confidential 
bulletin to the dealers is dated 
     June 13, 1956, and states the new heads are 10  to1.  It also states the 
heads are identified by part 
     "1730369-1".  They are not interchangeable  with the 9.0 1955 C300 
heads.  They are to be used only with 
     AGR-31 or colder plugs with ignition timing set  from 0 degrees to 4 
degrees BTDC "depending upon 
     octane rating of fuel available".    Wonder if these had a PN riveted on 
them as Owen surmised 
     his 390HP "C" may have.  Likely we will never  know.
 
3.  Chrysler microfilm records show only ONE C300 being built with a  manual 
(code 1) Tranny.  That car
     (built in June) did go to Kiekhaefer, who  apparently converted it to a 
300B for the next season!  How 
     many other C300s were converted by owners to  manual shift is anybody's 
guess.  
 
4.  Regarding octane, Hemis (sphereical segment combustion chambers)  are 
more tolerant of lower 
     octane because they don't "squish" the fuel-air  mixture as unevenly as 
other configurations.  I can
     only relate my personal experience of running my  300C in the sixties on 
Sunoco 190 with no problems.
     Ran right well too.  The car had its heads  milled also, as I was at one 
time going to make  it into a 
     390 HP version since I had one of the Isky cams  used in the Daytona 
Trials.  However, sanity prevailed 
     and I bought a stock 300C cam from Chrysler and  "did the right thing".
300ly, Gil Cunningham
Tallahassee, FL



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