1961 Chevy Impala heads

1961 CHEVROLET IMPALA
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DENNIS KURTZ
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Engine Mechanical problem
1961 Chevy Impala V8 Two Wheel Drive Manual ? miles

are cyl heads interchangeable? i sent mine out marked and they came back unmarked. they look the same but have different casting #, #3748770 & #3755550.any help would be greatly appreciated
Jan 1, 2010 at 11:21 AM
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ERNEST CLARK
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The casting number will vary with the parts suppliers and lot number.

As long as they are heads designed for your specific motor, they'll work just fine. But if you wanted to keep your original casting numbers (A Numbers-Matching Classic car), then you should contact the people who did your head work and tell them you want your original heads back.

Because what most rebuilders do is give you heads that where already rebuilt, and take yours as a core, for future rebuilding.
Jan 4, 2010 at 6:18 PM