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#1
11-26-2014, 04:39 PM
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1962 xo heads
so i now have a set of "xo" stamped 177's and a set of "oo" stamped 177's, then numerous non stamped sets. what is the difference in the oo stamps vs the xo stamps?
anyone know? thanks sam
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2007 Chrysler 300 C SRT8 2005 Pontiac G6 2000 Yamaha R1 1999 Chevy Silverado Ext Z71 1998 Ducati 916 SPS 1998 Honda ex300 1997 honda ex300 1997 Mustang Cobra 1997 Sea Doo Challenger 1800 1965 Bonne Coupe 421 3x2 1965 Bonne Conv 1964 Gp 4spd - parting 1963 Catalina Conv 3x2 4sp 1963 Gp 4spd 1963 Catalina post 4spd 1962 Bonne Conv 425a 3x2 4spd i have an addiction and need help... 
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#2
11-26-2014, 05:50 PM
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From McCarthy's book (page 32) there is this statement:
"NOTE: Cast #536109 heads with 10.75 C.R. are identified with a stamped "X" just above and left of the casting number. Heads with H.D. valve springs (425A) are stamped "O" above and right of the casting number. This method was used from 1958 through 1962." May be a clue? |
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#3
11-26-2014, 08:24 PM
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Yup, they sound like 425A heads. The original ones on my car had the same markings. Unfortunately they had a bunch of cracks, so I replaced them with regular compression heads.
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#4
11-26-2014, 09:33 PM
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425A heads.
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