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Old 03-23-2008, 07:04 PM
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GM Heads - Identification

How do you tell what type of heads a set are? I see alot of posts about "882" and "993" heads and so on and so forth?

I have a set of head's and I for the life of me can't find out what type they are. The casting number appears to be 1407*2*7 where the *'s are either a 6, 8, or a 9. (Can't really tell for 100% certain).

There are a few other numbers cast into them beneath the valve covers... but how in the world do I figure out what in the world I have!?

They are on a circa late 70's GM goodwrench crate engine.

Thanks in advance!!!

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Old 03-23-2008, 07:22 PM
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GM Heads - Identification

try this ---- http://www.mortec.com/castnum.htm
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Old 03-23-2008, 07:33 PM
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Thanks... yea, I've tried mortec and several others that list casting numbers. Unfortunately, none of them list anything close to the number on mine....
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Old 03-23-2008, 07:45 PM
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Jog down to your local auto parts or hardware store and get a steel toothbrush and a pint of kerosene. Apply vigorously to the offending numbers and you'll be able to see them clearly pretty quickly.
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Old 03-23-2008, 08:44 PM
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14071114...80-86...350
14075381...80-86...350..........Truck
14079261...86......350
These are the only 3 casting numbers in cylinder heads have a 1407 in the number.
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Old 03-23-2008, 09:10 PM
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how do you all determine if they are "882" or "993" types?
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Old 03-23-2008, 09:30 PM
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GM Heads - Identification

in the last three numbers of the long casting number .
can you flip over or have the intake off ?
the last three numbers are there .
that will tell you , use a mirror .
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Old 03-23-2008, 09:40 PM
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under where? the intake is off, but heads are still on block? hate to remove them.

under where? heads are still on block. hate to remove them. I thought all casting numbers were under valve covers?
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Old 03-23-2008, 10:04 PM
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per AERA manual for casting numbers.

14079267
14079261
14079287
14079267

79 to 86 350 chevy

sam-missle
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Old 03-23-2008, 10:10 PM
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sam-missile - THANK YOU! where did you source this information? What I'm really curious about are some of the specs of the heads... 64cc? 76cc? 1.94 or 2.02 intake and 1.5 or 1.6 exhaust? Screw in studs or press in.

The end answer I'm trying to get to is will they produce a little power and what is the best cam to work with them. I've heard anything over .470 lift is pushing it. What do you think if I upgrade valve springs as well?

Many thanks.... I'm eyeing 1 of 4 cams. Either one of the Lunati voodoo cam series, the Lunati Bracket Master II #00010, Comp XE268H, or Comp Magnum 270H.

Thoughts?
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Old 03-23-2008, 10:19 PM
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Quote:
Originally Posted by dhunt00c
sam-missile - THANK YOU! where did you source this information? What I'm really curious about are some of the specs of the heads... 64cc? 76cc? 1.94 or 2.02 intake and 1.5 or 1.6 exhaust? Screw in studs or press in.

The end answer I'm trying to get to is will they produce a little power and what is the best cam to work with them. I've heard anything over .470 lift is pushing it. What do you think if I upgrade valve springs as well?

Many thanks.... I'm eyeing 1 of 4 cams. Either one of the Lunati voodoo cam series, the Lunati Bracket Master II #00010, Comp XE268H, or Comp Magnum 270H.

Thoughts?
hi, the info is from my AERA casting number manual, unfortunately the manual does not give specific info like valve size, cc, etc. just the engine familly and years in production.

sam-missle
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Old 03-24-2008, 04:34 PM
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GM Heads - Identification

yes on top , but also the three ending numbers are on the intake runners , if you have intake off , you will see them
look at some heads that are off and you will see what i mean .
did you clean the other side and look .
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