jchapla

I'm trying to decode my numbers on my 327 cylinder heads. There are two different casting numbers which seem strange to me.

3917281 G58
3917291 G68

I was able to find 3917291 but unabale to find information on the other. I have a 68. Thanks in advance

dannyman

Check this out http://www.nastyz28.com/sbchevy/sblock.html

Edit : Oops, I gave the wrong link, should have given : http://www.mortec.com/

MidShark

I think if you look again really close, you'll see that what you think is an "8" is acually a "9" on the first head number. They are hard to read sometimes.

Rich

jchapla

It's really hard to tell. It is probably a "9" but it doesn't look as complete as the other side. Is there such a head with an "8" in it.

68mako2

3917281 Double hump head: I have one of these too. It is the right head on my 327-300 68 Corvette. The motor is around a July 68 build. My left head is 3917291. The later number is listed but like you I haven't found documentation on the first head number. Contrary to a comment you got about misreading the number, these are casting numbers and the right and left are different casting numbers as they come from different castings, ie -the left and right are not the same. I would be interested in hearing from you concerning this to see if you know anything more about this casting number. Thanks. Larry - 68mako2

Easy Mike

My hunch is that you have a pair of 291s cast on two consecutive days from different molds.

Mike Ward

My hunch is that a 6 year old dug up thread will not go anywhere.