| Re: [GMCnet] Oldsmobile 455 heads G vs J [message #324400 is a reply to message #324396] |
Tue, 26 September 2017 18:10   |
Emery Stora
Messages: 959
Registered: January 2011
Karma:
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Senior Member |
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James there is still confusion.
I agree that the G and J are what you want for a motorhome.
The G and J heads have a 2.000 intake and a 1.625 exhaust, except the marine G had a 2.070 intake.
However the 1973 and 1976 Ka had a 2.070 intake but the 74, 75 has the same as the J and G heads, 2.000.
And the Ka DOES HAVE hardened seats. The Ka has a 79cc combustion chamber which is the same as the J while the G has a 80cc chamber.
On Sep 26, 2017, at 2:39 PM, James Hupy wrote:
>
> You guys are confused. The K a heads have the large valves and ports
> combined with a smaller combustion chambers. They are NOT induction
> hardened, nor are the valves anything exotic. They are not the ideal head
> for heavy duty use. More suited for light weight high performance use. W-30
> option and 4-4-2, Hurst Olds, etc.
> The J and G heads are what you want for motorhomes.
> Jim Hupy
>
> On Sep 26, 2017 9:50 AM, "roy keen" wrote:
>
>> I had Ga heads that were small valve with hardened seats and rotaters. Not
>> all Ga's are large valve.
>> --
>> Roy Keen
>> Minden,NV
>> 76 X Glenbrook
>>
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