Technical strange small block chevy head casting mark?

gotta say I've seen a few sbc heads and never heard of these.....
anyone know what the deal is? casting number is 3947040

 

this is the typical head ID chart....

 

http://www.jalopyjournal.com/forum/threads/chevy-heads-question.489149/

 

My source says, 3947040 =

68-69 302-290 HP--2.02/1.6 valves 63.3 CC's

68-69 327-300 HP--1.94/1.5 valves 63.3 CC's

68-69 327-325 & 350 HP--2.02/1.6 valves 63.3 CC's

68-69 350-295 HP--1.94/1.5 valves 63.3 CC's

68-70 350-360 & 370 HP--2.02/1.6 valves 63.3 CC's
Equal to that of the double hump head. Might have been a service replacement part#?

 

This is what I found you,
"040" – 3947040. A good performance head (I have read). Supposedly these heads came on 1968 327 truck engines. They had 1.94/1.50" valves, 64CC combustion chambers, DO NOT have accessory holes. I do not have any port volume data for these castings. These heads also had a single triangular shaped casting mark (slope on the upper left).
I hope it helps...

Sent from my SM-G920V using H.A.M.B. mobile app

 

I agree they seem like some good heads, also thanks for the other hamb
link....

just odd casting mark, kind of like the standard triangle over rectangle. except triangle is leaning

 

Gotta say I've never seen that one, can you take a shot of the numbers under valve cover area.

 

Perfect, thanks
1968, both cast same day.
Kind of curious, you guys that recognize the casting number.
Is that casting ID mark odd or have I been living under a rock.

 

no your not living under rock i'm no expert, but i've seen afew heads and it is odd

 

I was gonna say maybe from a canadian pontiac? or a checker cab?

 

March 15th of '68 is date code.

 

Easy one guys. They are Fuelie heads. In 1968 and 1969 the double hump marks are exclusive to Saginaw casting plant (normally machined by Flint V8 engine plant). These are Tonawanda's version of the exact same specification head for 1968 model year. For 1969 model year Tonawanda 041 are the equivalent of Saginaw's 186. Note that Tonawanda only did the 1.94/1.5 valve version, Flint machined the 2.02/1.6 version.

 

These arent 041 heads..they are 040 heads. Never seen them before but I don't know everything. Seriously doubt used in any Z28, L79 etc....more inclined to think they are a truck head as mentioned earlier.

 

I again have to say those "o4o's" are one odd head casting logo.

I have a NOS pair of the last true "fueler" head castings, with the full camel hump, they are "291's", they look just like the previous 461's and 462's, just have a temp sender on the exhaust manifold face, a one year only head, the GM box said initial 1968 Corvette stock.
As 52 F-3's ID list shows; the 69's would be the small hump castings with the accessory bolt holes, the good number for 2.02 valve heads would be a "186" casting numbered head common to the 69 Z/28 302's' some other applications had smaller valves as HK1837 noted.

 

I never said they were 041 - I said they are the 1968 equivalent of an 041, like a 291 is a 1968 equivalent of a 186. Tonawanda and Flint used different casting numbers in 1968 and 1969. The equivalence is:

1968 fuelie - Flint 291, Tonawanda 040.
1969-70 fuelie - Flint 186, Tonawanda 041.

You generally won't find Tonawanda fuelie heads on L79's, Z28's etc as only Flint had the machining equipment for the 2.02/1.6 valves as far as I know, I guess it is possible that Flint machined some Tonawanda castings but that is probably going to be very rare. You will only find 040 on Tonawanda built 1968 327/275hp (L30) and 350/295hp (L48). Same in 1969 except Tonawanda 041's limited to I think the 350/300 (L48).

Also, the same casting mark as an 041, just presented in the old way, like a 186 is a double hump but done differently to a 291's double hump.

 

I am 45 in 1985 I was 13 and started working on a farm , one of the old houses sat a mile off the road in its barn yard sat a 68 C-60 or something that size tractors grow and fields need to be bigger I was gave the chore of junking the truck witch had some how took a hard slam on its side . after cutting the hood and front clip off I saw a V8 not a 6 . it was a 327 the farmer had crashed in his high school years his dad got it new too haul trees rocks and stuff to be burnt or rock pile it had those heads and were very close to double humps the suffix code ended in like xy or yx never did find it till the internet became popular seems like I remember it had long rods or something other than a steel crank

 

I doubt they were the original heads on a truck 327. The 040 heads were for the same application as the 291 fuelies wherever 1.94/1.5 valves were used. In 1968 this meant the only 327 to get them was the L30, the 275hp 1968 327. The only commercial application for this engine in 1968 was in an El Camino. The 1968 trucks used bigger chamber heads with 1.72/1.5 valves and smaller ports. They generally ran 8.0:1 compression in the 50 and 60 trucks or 8.5:1 compression in the 10, 20 and 30 trucks and were rated at respectively 185hp and 240hp. They were called a "high torque 327". The 185hp used dished pistons and a 2BBL carb, the 240hp was flat tops but with 75cc heads. They had forged crankshafts and heavier duty valves with rotators on them. Rods were 5.7". I'll see if I can find the cast number for these truck heads, pretty sure it is 3917293, possibly replaced earlier than normal by 3927188. As in earlier than the normal September year changeover date - reason I say this is some original GM documentation for 1968 truck engines show heads with accessory holes in the ends.

 

I worked in an automotive machine shop from 1979 to 1995. I seen these casting marks go through there sometime in the late 80s or early 90s. I am fairly certain that they were off a 67 or 68 350 290/ 300 hp engine. same engine that would have 041 heads on it in 69 or 70. Also in reference to someones comment. We also saw 041 heads in 2.02 configuration. It sure looked like factory machine work to us at the time. Good post. brought back tons of good memories.

 

I have a set of these heads my son and I pulled off a 67 283.We where told the motor was pulled out of the original truck and it was a factory replacement engine.

 

seeing as how this old post has been somewhat revived I have set that were to be used on a race engine that have a 370 casting anyone with an idea. years ago did a rough search and at that time info was that they are over counter warranty pontiac (canadian?)anyone have any info on them.

 

COULD THEY BE THE VERY RARE CAST ALUMINIUM HEADS CAST IN GERMANY FOR LATE 60S EARLY 70S A GUY AT THE PORTLAND SWAPMEET HAD A PAIR , WANTED 12K FOR THEM I HAD NEVER HEARD OF THEM BEFOR THAT.

 

MAYBE

 

WE HEAR YOU LOWD AND CLEAR!!!

 

GOT TO LOVE VON SKIP!

 

Very interesting......
So, ummm...... What's the story on those #370 aluminum heads???? Inquiring minds like mine what to see pictures of these things or it never really happened...

 

I found a set of #370 fuelie heads on ebay but I couldn't down load any of the 12 pictures to my phone......

 

Can anyone help or have a definitive answer for these heads without me pulling covers off?
I have the same over here in Australia

 

3rd post in the thread if your meaning the casting mark in first photo?

 

I´ve never heard of German made aluminum heads before. There were 4bbl Rockester carbed 283s with Power Pack heads and Powerglide used in Opel Diplomat As in the mid 60s and followed by the late 60s Diplomat B that had the 3970010 327 with the 492 camel hump heads, Quadrajet and TH400. I have a couple of both and they all were cast and machined in the USA. Both have center sump oil pans like Novas do, the 283 has the recessed oil filter boss. I have never seen oem aluminum heads on any of these, but I´m real curious now!Dang, now I want a set...hahahaha