DC high compression head

[dbb62]

According to Letourneau a high compression head was offered starting in 1950. I see two options on the parts list: A5505A and A5576A. Which is the standard head, and which is the "high compression" one? Thanks in advance.

 

[Zach81]

I believe the "all fuel" head is the 5505A.

 

[Anonymous-0]

The 5505 is the lp head and is the head that is comonly called the high compression head as to the other number I have not run across that number on mine.

 

[Jim McVay]

My Oh my yall need to brush up on your facts. The all fuel head was the A5476 the gas high compression head that used the same valves was the A5505 and the A6128 was the LP head that the valves are very hard to find. I hope I have the all fuel head number correct.

 

[mEl]

(quoted from post at 18:09:18 02/26/11) My Oh my yall need to brush up on your facts. The all fuel head was the A5476 the gas high compression head that used the same valves was the A5505 and the A6128 was the LP head that the valves are very hard to find. I hope I have the all fuel head number correct.

5576

 

[DKase]

I cannot believe everyone messed this up so bad! 4570 is the old low compression head used on the C and early D's. 5576 is the all fuel head. 5505 is the high compression gas head. 6128 is the LP head.

 

[mEl]

(quoted from post at 20:28:01 02/26/11) I cannot believe everyone messed this up so bad! 4570 is the old low compression head used on the C and early D's. 5576 is the all fuel head. 5505 is the high compression gas head. 6128 is the LP head.

You have it right D, I was only correcting the 5576 all fuel head number which he had as 5476 i believe without looking back. mEl

 

[samnel l bontregger]

this should give a HEADS UP

 

[Anonymous-0]

there's an MM valve that is dimensionally identical to the ex valves in a 6128