Factory 1999 Engine Modification Confusion

[TurboDiverArt]

Hi All,

I read the archive article regarding the changes in the1999 engine. I assume that this only applies to HUMMERS? I have a 1999 and there are differences from what is in the article. Mine has a metal fan and a CAT where the article says in 1999 they had a composite fan and they removed the CAT. Also, my engine revs higher than 3000 RPM when I stay on it but my engine definitely takes 8 quarts of oil, not 7. Would love to think that my engine has slightly lower compression if true. Very confusing, anyone got any input to

[Dvldog 8793]

VERY Interesting.....
My truck is '99 and It would seem that I have a mix of things listed. My truck will take 8qt if I let it drain without the filter on a hill for about an hour. :D On a regular fast oil change It seems to take about 7-7.5qt. my fan is metal, I have no cat but my truck is a 1ton thus does not have to have any extra "stuff". I suppose I'm gonna have to check my compression ratio. anyone know what the raw compression number should be?
L8r
Conley

[Kennedy]

There has never been a significant reduction in compression for the production 6.5. The 19 and 20:1 listings are incorrect.

[TurboDiverArt]

Originally posted by kennedy:
There has never been a significant reduction in compression for the production 6.5. The 19 and 20:1 listings are incorrect. John,

What's the correct compression then?

Thanks,
Art.

[triggerman]

General Engine products (AM General) Lists all "01" and newer commercial 6.5 engines with a 20.2 to 1 piston. Note, these are not the older General Motors 6.5's