What is the stock compression ratio of the P4 engine?
My cylinder head is marked 632955-1. What is the difference between this head and 632955-3?
As always, Thanks in advance!
See http://www.ply33.com/Models/P4/#specifications
6.7:1 was standard but they also offered a 5.2:1 compression ratio "econonmy" version. I'm guessing that was for using very low octane unleaded gas.
Don't know the difference in casting numbers on the head...
I believe they are the same part, the last number probably has to do with the casting date.