1971 LS5 engine: AIR-required, or not?

[Terry M.]

Re: 1971 LS5 engine: AIR-required, or not?

A table is a good idea. Are "running" updates/corrections possible? Or does all of this wait for the next edition?

In the past corrections/clarifications have waited for the next edition of the manuals. There is a place on this board for corrections/clarifications to the TIM&JGs, but it is largely unknown and unused. Posting corrections/clarifications there would IMO be useless as we would continually have to direct the unknowing and helpless to that location.

[Domenic T.]

Re: 1971 LS5 engine: AIR-required, or not?

Randy------


Well, that's interesting and the kind of empirical information I like. The information I have must be incorrect. Interesting, it also discounts the allegation that California-delivered base engine 1971's had AIR. At least, it discounts it for THM-equipped base engine cars. Does anyone out there have a 1971 with "CJL" or "CGT" coded engine?

Joe,
Don't know if this helps at all but I was a line mechanic in CA at a Chevy dealer in 1971. I saw a mixture of flat top piston cars without all the smog and dished piston cars with all the smog. The first 1971 car I opened up that had dished pistons shocked me and I called the service manager over to take a look. I told him that the factory put a truck engine in the car because truck engines had the lower compression dished pistons. He laughed and told me to get used to it, things are changing.

Dom

[Joe L.]

Re: 1971 LS5 engine: AIR-required, or not?

Joe,
Don't know if this helps at all but I was a line mechanic in CA at a Chevy dealer in 1971. I saw a mixture of flat top piston cars without all the smog and dished piston cars with all the smog. The first 1971 car I opened up that had dished pistons shocked me and I called the service manager over to take a look. I told him that the factory put a truck engine in the car because truck engines had the lower compression dished pistons. He laughed and told me to get used to it, things are changing.

Dom

Dom-------


For the 1971 model year, the across-the-board reduction in compression ratios was mostly accomplished by an increase in combustion chamber size. For 1972 and beyond dished pistons started appearing for many applications.

[Patrick H.]

Re: 1971 LS5 engine: AIR-required, or not?

A table is a good idea. Are "running" updates/corrections possible? Or does all of this wait for the next edition?

Given that it's a nominal change that shouldn't affect the page layout (though Gary would confirm) it might be possible to change it for the next printing rather than wait for the next edition. A table, though, would require a lot more of a change than a wording clarification and would likely have to wait.