Help needed to identify this sbc head

I need some help guys. I'm have a heck of a time figuring out what this head is.



but more importantly, what is a single hump designate?

 

Just type in "chevy cylinder head casting numbers" in your search engine. I forget the site but there are a few that have all the info you need.

Josh

 

3837064? (bit dark on my screen...)

56-62 265-283

 

http://www.ecbrcnj.com/id14.html

cc

 

it's Canadian. They do wierd things up there, the cold gets to them.....

 

I know it's a 265 head 56-62 and it has a date of 1963, but what does the single hump designate?

 

Cars & Parts Chevrolet V8 casting # book shows '55 - '56 265 p***. standard perf. & '55 -' 56 truck ...
302

 

go to motec(google it). i believe they're right about 99.9% of the time.
265's were 55/56 only.

 

and 1957

 

izzat 57 canadienne eh? or 57 u.s.??

 

Powerpro Series "Chevrolet Small-Block V-8 ID Guide" lists 3837064 as being '56 265 head with 1.72 intakes and 1.5 exhausts. The number 63 visible leads you to think that to be a date, although G.M. used a code showing month(usually a letter), day, and the last digit of the year, and not right under the casting #, of co**** anything is possible! Look at the bolt holes for the valve cover, are they directly above one-another? If so, they are post '58, earlier heads had staggered holes, hence the extra holes in the gaskets! It's my guess that the single hump don't mean much.---------------LEE

 

Wouldn't it simply mean its the 3738064 head casting!?!?

If I'm not mistaken, even the double hump performance castings used different shapes of double humps to identify the various castings without reading the numbers.
MIGHT have been for the ***embly line ID of the heads...

Are you asking if that single hump shape signifies some sort of performance head?

(Why am I suddenly humming "My Humps"?)

 

must be something to do with the camels they grow up north?

 

I've read a few places that it's a power pak head, but most don't say either way, nor any perticular info.

 

If you would show us a picture of the combustion chamber, maybe we could compare it to how a power pack head looks, and let you know? That's really about the only major difference between the early heads, aside from the real early 265 heads with the tiny ports.

so far we've been able to determine 3 things about the head:

1. Nobody has seen a single hump before

2. It's Canadian.

3. The casting numbers shows up as an early head used for several years on 265-283 engines.

 

what's the possibility of it bing a 265 made after they were phased out as a replacement engine for a warranty or parts program?? just wondering. i've got a set of those heads, and i THINK they were original to my 68 327. it wasn't the hi-po engine, but the 275-285 or whatever hp version.

 

The block is for a 56, but with a cast of 1960 (no it's not the good block for early '57 with starter mounts). The heads are 56-62 265/283 cast in 1963... ya it's a replacement. All the numbers jive, was told it was a power pak... just was trying to make sure... although it really doesn't matter. If the heads are PP I'd keep them on there... or may go to 305 heads, dunno yet.

 

Try here..............Chevy Tech.Net

 

I've seen that casting mark before but I didn't look at the date. I'm pretty sure it's the same as a power-pak with the "point" marking. If I remember the valves and combustion chambers were the same as power-pak.

overspray

 

See, the trouble with those casting numbers is that they are French Canadian. You have to translate them into French to be able to figure out what they mean.