This is what "Chevy by the Numbers" says (Alan L. Colvin, 1994).
The book has info only for '65-'69. He has a discussion on exactly which months
and years the heads were used, but basically, the 378462 was January '66 thru
April '67, with discrepancies towards the ends of the time frame. The only way
to tell valve diameter is to measure them. There doesn't seem to be any marking
or casting info to tell valve dia. or chamber size. The "camel hump" boss also
appears on the 3782461 heads, the predecessor to the 462, so "camel hump" heads
were used in other previous years, but the 462 only in '66-'67. Since you have
the number in addition to the casting identifier, here is the straight scoop on
YOUR heads:
1966
Model disp. hp int/exh chamber (c.c.)
Chevy/Pass 327 275 1.94/1.50 62.076
Chevelle 327 275 1.94/1.50 62.076
350 2.02/1.60
Corvette 327 300 1.94/1.50 62.076
350 2.02/1.60
Chevy II 327 275 1.94/1.50 62.076
300 2.02/1.60
1967
Chevy/Pass 327 275 1.94/1.50 63.305
Chevelle 327 275 1.94/1.50 63.305
325 2.02/1.60
Camaro 327 275 1.94/1.50 63.305
350 295 1.94/1.50
302 290 2.02/1.60
Corvette 327 300 1.94/1.50 63.305
327 350 2.02/1.60
Chevy II 327 275 1.94/1.50 63.305
350 2.02/1.60
This may be "overkill", but...........
Jon Elerath
jelerath@us.ibm.com
ace0027@ibm.net on 06/28/99 01:43:15 PM
Please respond to ace0027@ibm.net
To: Jon Elerath/San Jose/IBM@IBMUS
cc:
Subject: Re: [oletrucks] Casting # ID
Jon,
Oh good grief, I can't believe myself somtimes. It is a Small Block Chevy
head.
Thanks. Terry
jelerath@us.ibm.com wrote:
> Terry & Ace,
> What kind of engine is it (generally)? Inline 6? V-8? If it is an old chevy
> small block, I have a "numbers" book in which I can look it up. It contains
> valve info and chamber volumes.
>
> Jon Elerath
> jelerath@us.ibm.com
>
> ace0027@ibm.net on 06/28/99 11:48:06 AM
>
> Please respond to ace0027@ibm.net
>
> To: oletrucks <oletrucks@autox.team.net>
> cc: (bcc: Jon Elerath/San Jose/IBM)
> Subject: [oletrucks] Casting # ID
>
> I am having a terrible time finding any info on the heads I have
> here. What I'm needing to know is vavle size and combustion chamber
> size.
> The casting # is 890462
>
> I will appreciate any help!
>
> Terry & Ace
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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