327 Double Hump Head Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wlee · 08-01-2002, 12:53 PM

I recently acquired a pair of 327 double hump heads and have a casting # question. One of the heads is cast #3782461 and the other is #3890462. I’ve done a little research to try & find the differences between the two castings, and have found conflicting information. Thought maybe some of you experts could shed some light on my situation.

According to http://www.mortec.com/ the 461 is a 62cc chamber, and the 462 is a 64cc chamber – my SBC rebuild book says they are both 64cc . . . anyone know which is correct? Can these heads be used together without conflict?? Thanks!!

08-01-2002, 12:53 PM	#1
wlee Just an Old Mr Goodwrench Join Date: Feb 2002 Location: Green Ridge, MO USA Posts: 259	327 Double Hump Head Question I recently acquired a pair of 327 double hump heads and have a casting # question. One of the heads is cast #3782461 and the other is #3890462. I’ve done a little research to try & find the differences between the two castings, and have found conflicting information. Thought maybe some of you experts could shed some light on my situation. According to http://www.mortec.com/ the 461 is a 62cc chamber, and the 462 is a 64cc chamber – my SBC rebuild book says they are both 64cc . . . anyone know which is correct? Can these heads be used together without conflict?? Thanks!! __________________ 1969 CST 20 Longhorn 1970 CST 20 Fleetside 1991 Jaguar Sovereign 1992 Mazda Miata



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