The Official Studebaker Reference Guide How to identify cylinder head compression ratios - Studebaker Engines Engine type Part # Casting # Location Ratio Gasket "L" Head 1549218 1549218 Right Center 8.0-1   "L" Head 1548294 1548294 Right Center 7.0-1   OHV Head 1561582 none none 8.0-1 1558948 V8 537571 537555 Outside Center 8.0-1 8.5-1 535982 1545072 V8 536097 535976 Outside Center 7.5-1   V8 536790 Use 1557580   7.0-1   V8 1555295 1555294 Outside Center 8.25-1 1545072 V8 1557580 1557582 Outside Center 7.0-1 7.5-1 535982 1545072 V8 15557571 1557570 Outside Center 9.5-1 10.25-1 535982 1545072 V8 1557579 1557581 Outside Center 8.0-1 8.5-1 535982 1545072 OHV 1561582 none none 8.5-1 1550608 Note: Gasket 535982 is .050 thick and gasket 1545072 is .020 thick Table of Contents | Chapter 8