5.3L heads with 71cc Chambers?
If they are some kind of custom set (which wouldn't make any since) then a 71cc 5.3 is possible.
I had a set of 241 heads done and wanted lower compression. We had them finished to a 72cc head.
I doubt the 5.3's are a 71cc head. More then likely the ebay guys are wrong.
Item: 4.8 / 5.3 Chevy / GMC 862 Casting Cylinder head core (8032162711)



