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#1 |
Registered User
Join Date: Sep 2013
Location: Des Moines, IA
Posts: 23
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350 Head Identification
I was looking at the heads on my 350 the other day and noticed a cast indentification symbol. It is the verticle bar over rectangle. Which is supposed to be a 1957 Corvette 270 HP, 9.5:1 CR. Does anyone know anything about these heads? I had never seen that symbol before. Any info would as always be appreciated.
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#2 |
Registered User
Join Date: Dec 2010
Location: Gulf Breeze, FL
Posts: 127
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Re: 350 Head Identification
Should be a 997 casting number. I'm not positive, but I think they have 1.72" intake valves, 1.50" exhaust valves, 59cc chamber. Good head for a slightly modified engine that should yield decent performance and good economy
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'67 K10 SWB 350, SM465, NP205, 12 Bolt & Dana 44 w/ 3.08's My Project http://67-72chevytrucks.com/vboard/s...d.php?t=602684 |
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#3 |
Rottenwood Garage Member
Join Date: May 2005
Location: Marietta, Georgia
Posts: 4,321
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Re: 350 Head Identification
To be 100% sure on what you have pull one of the valve covers or both and get the cast number. All the info you need can then be obtained from running it.
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2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! It's not just a hobby..It's a LIFESTYLE!!! Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere! |
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#4 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,621
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Re: 350 Head Identification
Not '57 corvette heads.
Look at the bolt holes in the front of the heads! |
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#5 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,736
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Re: 350 Head Identification
X2 on above, look like standard 350/307 heads
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#6 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,269
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Re: 350 Head Identification
I think the addy with all of the casting info you could EVER need is at an addy like nastyz28. com if I am remembering right. There are others though that can help you identify the heads. If you would take the valve cover off and copy down the casting number and put it in this post I sure some here would help you with a decode, some guys like that stuff. Like motor detectives or something. Jim
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#7 |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: 350 Head Identification
http://www.crankshaftcoalition.com/w...identification
There might be some information in this link that will help you. The best way I know is to pop a valve cover and get the casting number and the date code and go from there.
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Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#8 |
One of the First
![]() Join Date: Jan 2000
Location: St. Augustine,FL.
Posts: 4,054
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Re: 350 Head Identification
You can get a base idea my matching these marking with a few charts on the above website.
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DAVID PASSMORE ST AUGUSTINE ,FL ZIP 32084 '71 SWB K/10 CUSTOM DELUXE (Chili) '72 BLAZER K/5 Muscle Truck (Mule) '72 LWB K/20 CHEYENNE (Blackie) |
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#9 |
Registered User
![]() Join Date: Jul 2013
Location: Forestburg, Texas
Posts: 659
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Re: 350 Head Identification
The fact that they have accessory bolt holes says they are 69 or newer.
The good iron heads have one or two humps. If you find a set that have only one hump hang on to them... they are rare. Those are over-the-counter "292 Turbo" heads.
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Mark Jesus is the Way! 2003 2500HD CCLB Duramax/Ali (Clifford) 2014 2SS/RS black on black Camaro (Betty) 2006 Pontiac SOLSTICE silver/black (Lula-Bell) 1970 C/10 Short Wide (Peggy) 1964 C/10 Short Step (Hambone) RIP Jimmy Hamilton Thank you for the trucks |
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#10 |
Registered User
Join Date: Sep 2013
Location: Des Moines, IA
Posts: 23
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Re: 350 Head Identification
The mini mystery deepens. The casting number on these heads is 1668668. It also has a stamp of GM 65. It has the vertical bar over rectangle pointing at the casting number between the valves as well as the vertical bar over rectangle on the front of the heads. I have not been able to find any info on casting number 1668668. I'm stumped.
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#11 |
Registered User
Join Date: Sep 2013
Location: Des Moines, IA
Posts: 23
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Re: 350 Head Identification
Here is a closer shot of the head symbol. The same symbol is under the valve cover pointing at the forge serial number. #1668668. Also a forge stamp that reads GM 65. And a couple of other photos.
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#12 |
Registered User
Join Date: Oct 2009
Location: Tampa Bay
Posts: 1,549
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Re: 350 Head Identification
Any chance you might have read that number (1668668) upside down and backward, with a misread on the last digit? That would make the head casting number 3998991. If so, then they are...307/350, 68-79, 1.72/1.50, 76cc Heads.
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CHEVY/GMC VIN DECODERS |
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#13 |
Registered User
Join Date: Sep 2013
Location: Des Moines, IA
Posts: 23
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Re: 350 Head Identification
I was wondering the same thing. I had my neighbor read off the numbers for me while I wrote them down. We were looking at the facing front passenger side from the top of the head to the bottom. Could be as those numbers don't make sense. But the GM 65 was read the same way. So it would have read 56 MG looking at it the other way. Doesn't make sense. But the verticle bar over rectangle seems only to be from 1957 as far as my research goes.
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![]() Last edited by Chaoszen; 10-21-2013 at 07:57 PM. Reason: mistake in number |
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#14 |
Registered User
Join Date: Sep 2013
Location: Des Moines, IA
Posts: 23
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Re: 350 Head Identification
Thanks everyone for helping me try to figure this out. I didn't build the motor and am trying to figure out if I might want to buy some better heads.
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#15 |
Registered User
Join Date: Sep 2013
Location: Des Moines, IA
Posts: 23
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Re: 350 Head Identification
There was a four digit number aswell. But I didn't think to write it down as I thought the 7 digit was the one I needed. I will take off the valve cover again and look.
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#16 | |
Registered User
Join Date: Oct 2009
Location: Tampa Bay
Posts: 1,549
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Re: 350 Head Identification
Quote:
![]() Have your friend read it again from the other direction and you'll see that 8 turn into a 3, and the number will be 3998991. Trust me on this one I seen the ol upside down and backward read plenty of times. 6's look like 9's 3's look like 8's and 5's get read as 2's and 7's and 1's get misread also. Your Gm 65 identifies the mold as number 65 and GM is of course GM.
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CHEVY/GMC VIN DECODERS Last edited by bruceman1968; 10-21-2013 at 09:54 PM. |
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#17 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: 350 Head Identification
Nice work Bruceman, that would make them the so called light weights. I've been pouring over my books and docs for a few hours.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#18 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: 350 Head Identification
What is the date code on the head? It would be a 4 digit code something like F137 under the valve cover similar the the casting number.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#19 |
Registered User
Join Date: Dec 2011
Location: Creighton Sask. Canada
Posts: 4,121
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Re: 350 Head Identification
No matter what with acc holes in them makes them a lot newer than the 50's or early to mid 60's. So forget about the early corvette part.
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