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Difference between Head Casting #s
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tolvoa
New User
| Posts: 9
| Joined: 10/09
Posted: 10/06/09
08:37 PM
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Does anyone know what the difference between head casting numbers that have the same specs would be?
For example 1970 Ram Air casting #s 12 & 13. Both were used on 400 motors, both have 2.11/1.77 valves and both have 72 CC combustion chambers. What difference was of enough significance that caused Pontiac to assign two different casting numbers?
I have asked a few Pontiac guys I know that very question and have not received a definitive answer. In other words...nobody I know really knows why.
I'd really love to know. Hope someone can shed some light on this for me and everyone that reads these posts.
Thanks Much...
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Posted: 10/07/09
05:03 AM
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The #12 heads were for manual transmission cars and the #13 heads were for automatic transmission cars.
professional hi-performance engine builder
Horsepower sells engines and torque wins races
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Brazil
Enthusiast
| Posts: 331
| Joined: 06/09
Posted: 10/07/09
07:24 AM
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Is there actually any difference?
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Posted: 10/07/09
08:08 AM
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Other then what I posted no there is no difference.
professional hi-performance engine builder
Horsepower sells engines and torque wins races
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Posted: 10/07/09
07:43 PM
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If you go to spottsperformance.com/head you can have the whole list of 67 to 79.
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