The double hump identification was used on the 3927186 "186" heads and the
3991492 "492" heads.
The 186 heads were produced between 68-72 had 2.02 intake and 1.60 exhaust.
This was refereed to as a fuelie head and came on 302, 327, and 350 motors.
The 492 heads were produced between 68-73 had either 1.94 or 2.02 intake
valves with 1.50 or 1.60 exhaust valves and came on 327 or 350 motors. 492
heads with 1.94 intake valves were intermediate heads. If they came with
2.02 intake valves they were high performance heads.
This and other engine information can be found in "Chevrolet small block
V-8 interchange manual"
Author David Lewis, Published by Motorbooks International Osceola,Wisconsin
54020.
1959 Chevrolet Apache ____ 3100
__________/___/\_____
Rich Kinas |::::::::::::::> | | ----- )
Orlando, FL "-------( 0 )---------------( 0 )-"
----------
From: Kevin Lake[SMTP:lakek@oit.edu]
Reply To: Kevin Lake
Sent: Thursday, February 04, 1999 1:45 PM
To: Wayne Osborne; oletrucks@autox.team.net
Subject: Re: [oletrucks] Re: Fuelie heads
I'm not sure, but I don't think the 2.02" valves were "stock" until the
introduction of the 302ci in the Camaro, and the LT-1 in the Corvette.
Most of the early GM heads that I have seen (that were still "stock") had
1.94" or smaller (intake valves). Unless you are doing something really
extreme with a small block (i.e. high RPM stuff, above 5000 RPM or so, or
large displacement like the 426ci small blocks), the big valves will not do
a lot for you. The 1.94" will normally give better low RPM performance.
Just my $.02 worth of opinion
----------
> From: Wayne Osborne <wcosborne@inetnow.net>
> To: oletrucks@autox.team.net
> Subject: Re: [oletrucks] Re: oletrucks:and other things
> Date: Thursday, February 04, 1999 9:40 AM
>
> My understanding is that the double humps indicate it is a head that
> houses the .202 valves which makes for a much better breathing head.
> I have a set on my 327, they are getting hard to find. Now i have seen
> heads where the humps were only about half as high--not sure about
> these guys.... Someone else will probably correct .. Wayne
>
>
> At 10:36 AM 2/4/99 -0600, you wrote:
> >What does the double humps or the point mean on the front of the
head;Take a
> >close look right above the power steering pump (camel humps). This is my
old
> >283:
> >http://www.n-link.com/~rameyfam/pictures/283l.jpg
> >
> >Robert Rogers wrote:
> >
> >> Roger,
> >>
> >> The PowerPac heads were stock on all 4bbl equipped cars. There is a
> >> difference between regular Powerpac heads and fuelie2-4bbl heads. If
you
> >> want, I can dig up the casting numbers so you can tell exactly what
you
> >> have. If the are true fuelie/2-4bbl heads they are worth about a
$1000
> >> U.S. a pair in good shape. Regular PPac heads are worth about $250 to
350
> >> U.S. per pair. You shouldn't have any problem selling them.
> >>
> >> I would love to have them but with the price of crude oil so low, I
haven't
> >> seen a commision check in months. No commision check means no new
"toys".
> >>
> >> Good Luck
> >>
> >> Robert
> >> 57 1/2 ton Panel custom
> >> 57 BA Sport Coupe restored to Factory new condition
> >> 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
> >
>
> ---------
> http://www.chevytrucks.org/users/wayne
> For a quick view of oletrucks mailing list members trucks go to:
> http://www.chevytrucks.org/users/wayne/member.html
>
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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