Engine Identification: Notes

First two letters in production code number identify engine displacement, carburetion, and compression ratio. Production code number is located on left side of block below front two spark plugs (350"); left side of block below rear two spark plugs (400", 430").

Engine			Compression Ratio	Code Letters
250" 2-Bbl.			8.5-1
350" 2-Bbl.			9.0-1	PO
		Export	7.6-1	PW
	4-Bbl.		10.25-1	PP
400" 4-Bbl.			10.25-1	PR
430" 4-Bbl.			10.25-1	PD
		Export	8.75-1	PE