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Topic: Identify cylinder head

in Forum: C3 Engines


Identify cylinder head

Posted: 1/3/07 1:50pm Message 1 of 8
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Joined: 7/24/2006
Posts: 48
Does anyone know what a Chevrolet cylinder head with casting number 3917291 is? Is it from a 350hp 327? I have a set in excellent condition and if they are "fuelie" heads, I might use them on my 300hp 350.


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Identify cylinder head

Posted: 1/3/07 2:09pm Message 2 of 8
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Eastern Oklahoma County, OK - USA
Joined: 1/3/2006
Posts: 1560
Vette(s): 1980 Black L48 T-Tops
I have a book at the house that I will check when I get home tonight.  There used to be a decoder on the internet but the link I have doesn't work anymore.


Identify cylinder head

Posted: 1/3/07 2:27pm Message 3 of 8
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Joined: 10/21/2003
Posts: 1220
Corvette Black Book lists them as for 1968, 327ci. 300hp or 350hp.


Identify cylinder head

Posted: 1/3/07 10:16pm Message 4 of 8
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.
3917291....67-68...302/327/350..Camel hump,no accessory holes,64cc chamber



Identify cylinder head

Posted: 1/5/07 9:05pm Message 5 of 8
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Joined: 4/17/2006
Posts: 11
Any body have info on a set of heads nos. 3947040?  I think they came off a killer '65 Malibu SS I had back then.


Identify cylinder head

Posted: 1/5/07 9:42pm Message 6 of 8
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Irving, TX - USA
Joined: 8/21/2004
Posts: 4273
Vette(s): #1 -1969 Corvette Coupe Riverside Gold, black interior,MN,A/C,350/350,PS,PB,window cranks. #2 -2000 C5, black/black, 6 sp, Bose system & lots of buttons.
Shocked Well, it's close to a '69 Vette Engine 350ci/300hp - heads stamped as 3947041.


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Identify cylinder head

Posted: 1/5/07 11:21pm Message 7 of 8
Former Member
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.
3947040....68......327.........."Right angle" casting identifier, 64cc chambers, good HP head, 
used in trucks, no accessory holes



Identify cylinder head

Posted: 1/9/07 9:17pm Message 8 of 8
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Calhoun City, MS - USA
Joined: 9/24/2005
Posts: 121
Vette(s): 1977 Black T-Top
I have a "BUILDING MUSCLE" book. It states "Casting no.3917291(1967-1968) almost identical to the 462 casting, these heads breath well due to their larger port volumes. you'll find them on 302,327,350 engines.


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