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| Re: [GMCnet] 455 Head Identification [message #139554 is a reply to message #139537] |
Tue, 16 August 2011 21:47   |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: to the best of my knowledge the motorhomes used the J head, small valve smog heads. They have more torque at the <3000 rpms that the motorhome runs. The G head was standard 455 in 1971 and do have hardened valve seats and possibly rotaters. It could have small intake valves (2.0) same as motorhome or it could have the larger 2.072 intakes. Both have 1.625 exhaust. 80cc combustion chamber on the G head, the J head was either 80cc or 82cc. I would think the G head would work well on the motorhome. The 1970 F (W-30) is the rare ones.
There are a few of us sickos that would love to have a 1970 W-34 Toro engine. Here is some info on the heads.
http://www.442.com/oldsfaq/ofhed.htm#Heads 1964 - 1990
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] 455 Head Identification [message #139557 is a reply to message #139554] |
Tue, 16 August 2011 21:51 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I have a pair of bare, tanked, G heads but I haven't checked the seat
diameters. They're available if anyone needs them (some J heads too, not
tanked or otherwise checked).
Ken H.
On Tue, Aug 16, 2011 at 10:47 PM, Charles Boyd <covered-wagon@comcast.net>wrote:
> Sir: to the best of my knowledge the motorhomes used the J head, small
> valve smog heads. They have more torque at the <3000 rpms that the motorhome
> runs. The G head was standard 455 in 1971 and do have hardened valve seats
> and possibly rotaters. It could have small intake valves (2.0) same as
> motorhome or it could have the larger 2.072 intakes. Both have 1.625
> exhaust. 80cc combustion chamber on the G head, the J head was either 80cc
> or 82cc. I would think the G head would work well on the motorhome. ...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] 455 Head Identification [message #139592 is a reply to message #139557] |
Wed, 17 August 2011 01:00 |
Chuck Garton
Messages: 54
Registered: June 2006
Karma: 0
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Member |
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"J" heads were used from 1974 to the end of 455 production. 1973 GMC's
had "G" heads
Chuck Garton
77 Kingsley 455
Ridgecrest, CA
On Tue, Aug 16, 2011 at 7:51 PM, Ken Henderson <hend4800@bellsouth.net> wrote:
> I have a pair of bare, tanked, G heads but I haven't checked the seat
> diameters. They're available if anyone needs them (some J heads too, not
> tanked or otherwise checked).
>
> Ken H.
>
>
> On Tue, Aug 16, 2011 at 10:47 PM, Charles Boyd <covered-wagon@comcast.net>wrote:
>
>> Sir: to the best of my knowledge the motorhomes used the J head, small
>> valve smog heads. They have more torque at the <3000 rpms that the motorhome
>> runs. The G head was standard 455 in 1971 and do have hardened valve seats
>> and possibly rotaters. It could have small intake valves (2.0) same as
>> motorhome or it could have the larger 2.072 intakes. Both have 1.625
>> exhaust. 80cc combustion chamber on the G head, the J head was either 80cc
>> or 82cc. I would think the G head would work well on the motorhome. ...
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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