Cyl. Head Code
Thread Starter
Racer
Joined: Jul 2007
Posts: 401
Likes: 8
From: Jackson TN
Cyl. Head Code
I have a pair of small block GM heads that I have had for years and I'd like to know what they are.
In the casting there is a number 3917291 and under that there is a number 1217. Another casting has GM with the number 18 under that.
Thanks,
In the casting there is a number 3917291 and under that there is a number 1217. Another casting has GM with the number 18 under that.
Thanks,
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
There were three different versions of that head with 2 different valve sizes and a temp port or not used on a few different vehicles.
It was one of the heads used for the Z28 302 if the valves are 202
the 194 valve heads were used on the 68 ss350 engines.
Ones with the water sender port are for '68 and without used in '67
I have a set of '67 302 heads with casting #462, the other ones used.
It was one of the heads used for the Z28 302 if the valves are 202
the 194 valve heads were used on the 68 ss350 engines.
Ones with the water sender port are for '68 and without used in '67
I have a set of '67 302 heads with casting #462, the other ones used.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
Thread Starter
Racer
Joined: Jul 2007
Posts: 401
Likes: 8
From: Jackson TN
There were three different versions of that head with 2 different valve sizes and a temp port or not used on a few different vehicles.
It was one of the heads used for the Z28 302 if the valves are 202
the 194 valve heads were used on the 68 ss350 engines.
Ones with the water sender port are for '68 and without used in '67
I have a set of '67 302 heads with casting #462, the other ones used.
It was one of the heads used for the Z28 302 if the valves are 202
the 194 valve heads were used on the 68 ss350 engines.
Ones with the water sender port are for '68 and without used in '67
I have a set of '67 302 heads with casting #462, the other ones used.
I bought these heads over 30 years ago for a Camaro that I was building and ending up selling the project undone.
I'm trying to figure out what I have and what they are worth.
Thanks for all the replies.
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
The humper heads are pretty common these days because they are not desireable for performance anymore. They were hot in the 70's. Normally go for around 200 bucks or less unfinnished, but have seen them sell for 100 too.
Only desireable for a restoration and need correct cast # and date code for that.
If they are right for a 302 z engine then they could be worth a little more, but the market is pretty small.
Mine are correct for a 67 302, but I still have them.
Only desireable for a restoration and need correct cast # and date code for that.
If they are right for a 302 z engine then they could be worth a little more, but the market is pretty small.
Mine are correct for a 67 302, but I still have them.
Thread Starter
Racer
Joined: Jul 2007
Posts: 401
Likes: 8
From: Jackson TN
The humper heads are pretty common these days because they are not desireable for performance anymore. They were hot in the 70's. Normally go for around 200 bucks or less unfinnished, but have seen them sell for 100 too.
Only desireable for a restoration and need correct cast # and date code for that.
If they are right for a 302 z engine then they could be worth a little more, but the market is pretty small.
Mine are correct for a 67 302, but I still have them.
Only desireable for a restoration and need correct cast # and date code for that.
If they are right for a 302 z engine then they could be worth a little more, but the market is pretty small.
Mine are correct for a 67 302, but I still have them.
