Quote:
Originally Posted by FirstOwner69
Same info in the '69 truck info kit (pages 60 and 61). The footnotes at the bottom seem to show that emissions is likely the biggest difference. The LS-9 has AIR whereas the LS-8 has nothing or CCS. Of course, all have a PCV. My '69 3/4 ton only has PCV and is on the SPID as a LS8.
Also, see page 54 for performance data comparisons.
https://www.gmheritagecenter.com/doc...olet-Truck.pdf |
I see. I usually only root around the '71 stuff and for that year they left stuff out of the truck info pack. The note at the end of page 54 specifics that CCS is used in Automatic, and AIR is used for manual transmission applications. CCS is merely a different carb calibration, distributor curve, and atleast for 1971 a thermostatic air cleaner. Because you have M49, you lucked out and didn't get a smog pump. Page 57 also mentions you should have those valve rotators. Pretty cool I think.